From e11b182662e84e053c98280d9c07cf793807dc49 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Tue, 30 Sep 2025 22:52:46 -0700
Subject: [PATCH 01/60] float datatype

---
 src/NumberPractice.java | 2 ++
 toRefresh.md            | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/NumberPractice.java b/src/NumberPractice.java
index bbec2fe..c7e6dfb 100644
--- a/src/NumberPractice.java
+++ b/src/NumberPractice.java
@@ -1,6 +1,8 @@
 public class NumberPractice {
   public static void main(String args[]) {
     // Create a float with a negative value and assign it to a variable
+    float num = -2.345f;
+    System.out.println(num);
 
     // Create an int with a positive value and assign it to a variable
 
diff --git a/toRefresh.md b/toRefresh.md
index 163dcab..83db772 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -2,4 +2,4 @@
 
 As you work through this exercise, write down anything that you needed to look up or struggled to remember here. It can be just a word or two (e.g. "joining strings"). You can use this as a guide of what to make extra sure you're refreshed on before exams and interviews.
 
-- 
\ No newline at end of file
+- float datatype
\ No newline at end of file

From e93e6a00b2e58c6ff486032ccfa5e31d60bd35d1 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Tue, 30 Sep 2025 22:55:31 -0700
Subject: [PATCH 02/60] Positive int number

---
 src/NumberPractice.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/NumberPractice.java b/src/NumberPractice.java
index c7e6dfb..6f47e8a 100644
--- a/src/NumberPractice.java
+++ b/src/NumberPractice.java
@@ -5,6 +5,8 @@ public static void main(String args[]) {
     System.out.println(num);
 
     // Create an int with a positive value and assign it to a variable
+    int positiveNum = 5;
+    System.out.println(positiveNum);
 
     // Use the modulo % operator to find the remainder when the int is divided by 3
 

From 9eb9164d2c289c60f93534fd8cc3883ed845a057 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Tue, 30 Sep 2025 23:05:33 -0700
Subject: [PATCH 03/60] Find remainder using modulo

---
 src/NumberPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/NumberPractice.java b/src/NumberPractice.java
index 6f47e8a..c55bde5 100644
--- a/src/NumberPractice.java
+++ b/src/NumberPractice.java
@@ -9,6 +9,7 @@ public static void main(String args[]) {
     System.out.println(positiveNum);
 
     // Use the modulo % operator to find the remainder when the int is divided by 3
+    System.out.println(positiveNum % 3);
 
     // Use the modulo % operator to determine whether the number is even
     // (A number is even if it has a remainder of zero when divided by 2)

From 477b58eb3b278e31977e643f11b98b6142301880 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Tue, 30 Sep 2025 23:12:00 -0700
Subject: [PATCH 04/60] Determine whether the num is even or odd

---
 src/NumberPractice.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/NumberPractice.java b/src/NumberPractice.java
index c55bde5..621fda5 100644
--- a/src/NumberPractice.java
+++ b/src/NumberPractice.java
@@ -15,6 +15,11 @@ public static void main(String args[]) {
     // (A number is even if it has a remainder of zero when divided by 2)
     // Use an if-else to print "Even" if the number is even and "Odd"
     // if the number is odd.
+    if (positiveNum % 2 == 0){
+      System.out.println("Even");
+    } else {
+      System.out.println("Odd");
+    }
 
     // Divide the number by another number using integer division
 

From 4d908f21f3d9e71c184c5e8eb5a0455cf5b57570 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Tue, 30 Sep 2025 23:14:18 -0700
Subject: [PATCH 05/60] Divide num by another number

---
 src/NumberPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/NumberPractice.java b/src/NumberPractice.java
index 621fda5..74acb75 100644
--- a/src/NumberPractice.java
+++ b/src/NumberPractice.java
@@ -22,6 +22,7 @@ public static void main(String args[]) {
     }
 
     // Divide the number by another number using integer division
+    System.out.println(positiveNum / 5);
 
     /*
      * Reminder!

From 6844f3418456c08a77e59832277916b0452d5e65 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 09:16:44 -0700
Subject: [PATCH 06/60] Created an empty ArrayList of Strings

---
 src/ListPractice.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index f4de8e7..96fffc0 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -1,8 +1,10 @@
-public class ListPractice {
+import java.util.*;
 
+public class ListPractice {
 
   public static void main(String[] args) {
     // Create an empty ArrayList of Strings and assign it to a variable of type List
+    List<String> list = new ArrayList<>();
 
     // Add 3 elements to the list (OK to do one-by-one)
 

From 76c31c5403f5d957d13492f507944214574b7185 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 10:47:30 -0700
Subject: [PATCH 07/60] Added 3 elements to the list and updated toRefresh

---
 src/ListPractice.java | 4 ++++
 toRefresh.md          | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index 96fffc0..383b89f 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -7,6 +7,10 @@ public static void main(String[] args) {
     List<String> list = new ArrayList<>();
 
     // Add 3 elements to the list (OK to do one-by-one)
+    list.add("Hi");
+    list.add("Hello");
+    list.add("Good morning");
+    System.out.println(list);
 
     // Print the element at index 1
 
diff --git a/toRefresh.md b/toRefresh.md
index 83db772..db1f274 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -2,4 +2,5 @@
 
 As you work through this exercise, write down anything that you needed to look up or struggled to remember here. It can be just a word or two (e.g. "joining strings"). You can use this as a guide of what to make extra sure you're refreshed on before exams and interviews.
 
-- float datatype
\ No newline at end of file
+- float datatype
+- Syntax to create empty ArrayList/List
\ No newline at end of file

From 97094ec1449a58e87939bb6cef35ea553603c56f Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 10:55:20 -0700
Subject: [PATCH 08/60] Print element at index, updated toRefresh

---
 src/ListPractice.java | 1 +
 toRefresh.md          | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index 383b89f..3de95ff 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -13,6 +13,7 @@ public static void main(String[] args) {
     System.out.println(list);
 
     // Print the element at index 1
+    System.out.println(list.get(1));
 
     // Replace the element at index 1 with a new value
     // (Do not insert a new value. The length of the list should not change)
diff --git a/toRefresh.md b/toRefresh.md
index db1f274..57c8611 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -3,4 +3,5 @@
 As you work through this exercise, write down anything that you needed to look up or struggled to remember here. It can be just a word or two (e.g. "joining strings"). You can use this as a guide of what to make extra sure you're refreshed on before exams and interviews.
 
 - float datatype
-- Syntax to create empty ArrayList/List
\ No newline at end of file
+- Syntax to create empty ArrayList/List
+- .get() to find element at index
\ No newline at end of file

From e3bb283acd4045e2762658a976b75f8a9eaeb906 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:06:25 -0700
Subject: [PATCH 09/60] replaced element at index, updated toRefresh

---
 src/ListPractice.java | 2 ++
 toRefresh.md          | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index 3de95ff..080cd83 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -17,6 +17,8 @@ public static void main(String[] args) {
 
     // Replace the element at index 1 with a new value
     // (Do not insert a new value. The length of the list should not change)
+    list.set(1,"Hey");
+    System.out.println(list);
 
     // Insert a new element at index 0 (the length of the list will change)
 
diff --git a/toRefresh.md b/toRefresh.md
index 57c8611..d9601a4 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -4,4 +4,5 @@ As you work through this exercise, write down anything that you needed to look u
 
 - float datatype
 - Syntax to create empty ArrayList/List
-- .get() to find element at index
\ No newline at end of file
+- .get() to find element at index
+- .set() to replace an element at index
\ No newline at end of file

From a245bb3bb34d4ce6e99f0a7c94ebf7c85c86dc56 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:11:56 -0700
Subject: [PATCH 10/60] Inserted new element at index

---
 src/ListPractice.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index 080cd83..f0df3c2 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -21,8 +21,11 @@ public static void main(String[] args) {
     System.out.println(list);
 
     // Insert a new element at index 0 (the length of the list will change)
+    list.add(0, "Good night");
+    System.out.println(list);
 
     // Check whether the list contains a certain string
+    
 
     // Iterate over the list using a traditional for-loop.
     // Print each index and value on a separate line

From 47cbc1ffbb5237dbdb74b456c44185eb773610bd Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:13:47 -0700
Subject: [PATCH 11/60] Checked list for certain string

---
 src/ListPractice.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index f0df3c2..c5fc13c 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -25,7 +25,7 @@ public static void main(String[] args) {
     System.out.println(list);
 
     // Check whether the list contains a certain string
-    
+    System.out.println(list.contains("Hey"));
 
     // Iterate over the list using a traditional for-loop.
     // Print each index and value on a separate line

From e265ccb55532295b046561548a50f9a1a2199c9d Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:26:51 -0700
Subject: [PATCH 12/60] Using traditional for-loop to iterate list and print
 index-value, updated toRefresh

---
 src/ListPractice.java | 4 ++++
 toRefresh.md          | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index c5fc13c..fee4f94 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -29,6 +29,10 @@ public static void main(String[] args) {
 
     // Iterate over the list using a traditional for-loop.
     // Print each index and value on a separate line
+    for (int i = 0; i < list.size(); i++){
+      String word = list.get(i);
+      System.out.println("Value at index " + i + ": " + word);
+    }
 
     // Sort the list using the Collections library
 
diff --git a/toRefresh.md b/toRefresh.md
index d9601a4..96ce095 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -5,4 +5,5 @@ As you work through this exercise, write down anything that you needed to look u
 - float datatype
 - Syntax to create empty ArrayList/List
 - .get() to find element at index
-- .set() to replace an element at index
\ No newline at end of file
+- .set() to replace an element at index
+- .size() to get number of elements in list
\ No newline at end of file

From 7a5207163dc339ff78035cab74957bc5766a8c6a Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:30:09 -0700
Subject: [PATCH 13/60] Used the Collections library, updated toRefresh

---
 src/ListPractice.java | 2 ++
 toRefresh.md          | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index fee4f94..9a92167 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -35,6 +35,8 @@ public static void main(String[] args) {
     }
 
     // Sort the list using the Collections library
+    Collections.sort(list);
+    System.out.println(list);
 
     // Iterate over the list using a for-each loop
     // Print each value on a second line
diff --git a/toRefresh.md b/toRefresh.md
index 96ce095..47020a0 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -6,4 +6,5 @@ As you work through this exercise, write down anything that you needed to look u
 - Syntax to create empty ArrayList/List
 - .get() to find element at index
 - .set() to replace an element at index
-- .size() to get number of elements in list
\ No newline at end of file
+- .size() to get number of elements in list
+- Collections.sort()
\ No newline at end of file

From 249b9d4a2b64da00b32fa830bbe3c1ea0528a029 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:34:54 -0700
Subject: [PATCH 14/60] Used for-each loop to print each value

---
 src/ListPractice.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ListPractice.java b/src/ListPractice.java
index 9a92167..5613f5b 100644
--- a/src/ListPractice.java
+++ b/src/ListPractice.java
@@ -40,6 +40,9 @@ public static void main(String[] args) {
 
     // Iterate over the list using a for-each loop
     // Print each value on a second line
+    for (String str : list){
+      System.out.println(str);
+    }
 
     /*
      * Usage tip!

From 701eb23f472132907ac4b379000cad950d2567f6 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:47:41 -0700
Subject: [PATCH 15/60] Created array of Strings, update toRefresh

---
 src/ArrayPractice.java | 2 ++
 toRefresh.md           | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ArrayPractice.java b/src/ArrayPractice.java
index bc58c83..506509c 100644
--- a/src/ArrayPractice.java
+++ b/src/ArrayPractice.java
@@ -1,6 +1,8 @@
+
 public class ArrayPractice {
   public static void main(String[] args) {
     // Create an array of Strings of size 4
+    String[] array = new String[4];
 
     // Set the value of the array at each index to be a different String
     // It's OK to do this one-by-one
diff --git a/toRefresh.md b/toRefresh.md
index 47020a0..db6e7f8 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -7,4 +7,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .get() to find element at index
 - .set() to replace an element at index
 - .size() to get number of elements in list
-- Collections.sort()
\ No newline at end of file
+- Collections.sort()
+- Arrays vs Lists
\ No newline at end of file

From f3761192810da3b0664af1f5c801276aa69ff9a5 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:57:20 -0700
Subject: [PATCH 16/60] Added values to each index in array

---
 src/ArrayPractice.java | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/ArrayPractice.java b/src/ArrayPractice.java
index 506509c..961506c 100644
--- a/src/ArrayPractice.java
+++ b/src/ArrayPractice.java
@@ -6,6 +6,14 @@ public static void main(String[] args) {
 
     // Set the value of the array at each index to be a different String
     // It's OK to do this one-by-one
+    array[0] = "Noodles";
+    array[1] = "Rice";
+    array[2] = "Pasta";
+    array[3] = "Bread";
+    System.out.println(array[0]);
+    System.out.println(array[1]);
+    System.out.println(array[2]);
+    System.out.println(array[3]);
 
     // Get the value of the array at index 2
 

From be3dab2d51e972939222680a243c0e830c94e8f9 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 11:59:42 -0700
Subject: [PATCH 17/60] Get value at index 2

---
 src/ArrayPractice.java | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/ArrayPractice.java b/src/ArrayPractice.java
index 961506c..ac7ec61 100644
--- a/src/ArrayPractice.java
+++ b/src/ArrayPractice.java
@@ -10,12 +10,13 @@ public static void main(String[] args) {
     array[1] = "Rice";
     array[2] = "Pasta";
     array[3] = "Bread";
-    System.out.println(array[0]);
-    System.out.println(array[1]);
-    System.out.println(array[2]);
-    System.out.println(array[3]);
+    // System.out.println(array[0]);
+    // System.out.println(array[1]);
+    // System.out.println(array[2]);
+    // System.out.println(array[3]);
 
     // Get the value of the array at index 2
+    System.out.println(array[2]);
 
     // Get the length of the array
 

From 827ed3d350b593ed0c26ceea6c8943c53fe3af11 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:01:41 -0700
Subject: [PATCH 18/60] Find the length of the array

---
 src/ArrayPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/ArrayPractice.java b/src/ArrayPractice.java
index ac7ec61..6fb13f1 100644
--- a/src/ArrayPractice.java
+++ b/src/ArrayPractice.java
@@ -19,6 +19,7 @@ public static void main(String[] args) {
     System.out.println(array[2]);
 
     // Get the length of the array
+    System.out.println(array.length);
 
     // Iterate over the array using a traditional for loop and print out each item
 

From c5fb9c353c18f9117f1455c452a82d0c5d0a8d9b Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:06:21 -0700
Subject: [PATCH 19/60] Traditional for-loop to print each item, updated
 toRefresh

---
 src/ArrayPractice.java | 3 +++
 toRefresh.md           | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/ArrayPractice.java b/src/ArrayPractice.java
index 6fb13f1..7254eae 100644
--- a/src/ArrayPractice.java
+++ b/src/ArrayPractice.java
@@ -22,6 +22,9 @@ public static void main(String[] args) {
     System.out.println(array.length);
 
     // Iterate over the array using a traditional for loop and print out each item
+    for (int i = 0; i < array.length; i++){
+      System.out.println(array[i]);
+    }
 
     // Iterate over the array using a for-each loop and print out each item
 
diff --git a/toRefresh.md b/toRefresh.md
index db6e7f8..7f3b895 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -8,4 +8,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .set() to replace an element at index
 - .size() to get number of elements in list
 - Collections.sort()
-- Arrays vs Lists
\ No newline at end of file
+- Arrays vs Lists
+- traditional for-loop for arrays
\ No newline at end of file

From 1106f23eac154a500968e847e1ee961e80115599 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:09:14 -0700
Subject: [PATCH 20/60] Used for-each loop to print out items

---
 src/ArrayPractice.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ArrayPractice.java b/src/ArrayPractice.java
index 7254eae..e570394 100644
--- a/src/ArrayPractice.java
+++ b/src/ArrayPractice.java
@@ -27,6 +27,9 @@ public static void main(String[] args) {
     }
 
     // Iterate over the array using a for-each loop and print out each item
+    for (String str : array) {
+      System.out.println(str);
+    }
 
     /*
      * Reminder!

From 9365bebcc5e70fb20910b15dd4475ce29cb8f7d1 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:12:41 -0700
Subject: [PATCH 21/60] Assigned String to variable

---
 src/StringPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 8d87617..286f30b 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -1,6 +1,7 @@
 public class StringPractice {
   public static void main(String[] args) {
     // Create a string with at least 5 characters and assign it to a variable
+    String word = "October";
 
     // Find the length of the string
 

From 2ee4e8eb979b1f901a8923b701ab60a29a912073 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:15:13 -0700
Subject: [PATCH 22/60] Find length of the string

---
 src/StringPractice.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 286f30b..6bef0b4 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -2,8 +2,10 @@ public class StringPractice {
   public static void main(String[] args) {
     // Create a string with at least 5 characters and assign it to a variable
     String word = "October";
+    System.out.println(word);
 
     // Find the length of the string
+    System.out.println(word.length());
 
     // Concatenate (add) two strings together and reassign the result
 

From 8f680c1d9cfabf3bf715239c811043a7d50a3ba7 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:18:32 -0700
Subject: [PATCH 23/60] Concatenate two strings together

---
 src/StringPractice.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 6bef0b4..42184f7 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -8,7 +8,10 @@ public static void main(String[] args) {
     System.out.println(word.length());
 
     // Concatenate (add) two strings together and reassign the result
-
+    String word2 = "November";
+    String newWord = word + word2;
+    System.out.println(newWord);
+    
     // Find the value of the character at index 3
 
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)

From 4f3786367b26321bb35d4f33eaa5de0eaf1c8129 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:22:08 -0700
Subject: [PATCH 24/60] Find character at index

---
 src/StringPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 42184f7..a8b3d85 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -13,6 +13,7 @@ public static void main(String[] args) {
     System.out.println(newWord);
     
     // Find the value of the character at index 3
+    System.out.println(newWord.charAt(3));
 
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
 

From b7e4637fe885d6a12925751fd44558eb570e0216 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 12:26:44 -0700
Subject: [PATCH 25/60] Added a space between the two strings

---
 src/StringPractice.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index a8b3d85..791ca5b 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -9,7 +9,7 @@ public static void main(String[] args) {
 
     // Concatenate (add) two strings together and reassign the result
     String word2 = "November";
-    String newWord = word + word2;
+    String newWord = word + " " + word2;
     System.out.println(newWord);
     
     // Find the value of the character at index 3
@@ -17,6 +17,7 @@ public static void main(String[] args) {
 
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
 
+
     // Iterate over the characters of the string, printing each one on a separate line
 
     // Create an ArrayList of Strings and assign it to a variable

From ce8bceae2cddfdb430c3bd24e4987f9ce197070a Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 14:22:43 -0700
Subject: [PATCH 26/60] Check String for substring

---
 src/StringPractice.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 791ca5b..4170e61 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -16,7 +16,11 @@ public static void main(String[] args) {
     System.out.println(newWord.charAt(3));
 
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
-
+    if (newWord.contains("Nov")){
+      System.out.println("True");
+    } else {
+      System.out.println("False");
+    }
 
     // Iterate over the characters of the string, printing each one on a separate line
 

From 0c28e0d05670b627ae72c6397c7c33c735c65425 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 14:29:28 -0700
Subject: [PATCH 27/60] Iterate through characters of the string, updated
 toRefresh

---
 src/StringPractice.java | 4 ++++
 toRefresh.md            | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 4170e61..07aae4a 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -23,6 +23,10 @@ public static void main(String[] args) {
     }
 
     // Iterate over the characters of the string, printing each one on a separate line
+    for (int i = 0; i < newWord.length(); i++){
+      char c = newWord.charAt(i);
+      System.out.println(c);
+    }
 
     // Create an ArrayList of Strings and assign it to a variable
 
diff --git a/toRefresh.md b/toRefresh.md
index 7f3b895..7fd2ee7 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -9,4 +9,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .size() to get number of elements in list
 - Collections.sort()
 - Arrays vs Lists
-- traditional for-loop for arrays
\ No newline at end of file
+- traditional for-loop for arrays
+- charAt() to return the character at index
\ No newline at end of file

From 4650784985d6b2324e32f3aa0739f5c813e88723 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 14:33:51 -0700
Subject: [PATCH 28/60] Created an ArrayList of Strings

---
 src/StringPractice.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 07aae4a..bc885b2 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -1,3 +1,5 @@
+import java.util.ArrayList;
+
 public class StringPractice {
   public static void main(String[] args) {
     // Create a string with at least 5 characters and assign it to a variable
@@ -29,6 +31,7 @@ public static void main(String[] args) {
     }
 
     // Create an ArrayList of Strings and assign it to a variable
+    ArrayList<String> list = new ArrayList<>();
 
     // Add multiple strings to the List (OK to do one-by-one)
 

From f7fa0f17bc8c814483bf4f5c64b8d443c9c3fae3 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 14:36:23 -0700
Subject: [PATCH 29/60] Add multiple strings to arraylist

---
 src/StringPractice.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index bc885b2..6acbe58 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -34,6 +34,11 @@ public static void main(String[] args) {
     ArrayList<String> list = new ArrayList<>();
 
     // Add multiple strings to the List (OK to do one-by-one)
+    list.add("Blue");
+    list.add("White");
+    list.add("Green");
+    list.add("Red");
+    System.out.println(list);
 
     // Join all of the strings in the list together into a single string separated by commas
     // Use a built-in method to achieve this instead of using a loop

From 0ce987b97932142174318c928f1d785f9c2cf8ef Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 14:45:44 -0700
Subject: [PATCH 30/60] Used built in method to join strings together, updated
 toRefresh

---
 src/StringPractice.java | 2 ++
 toRefresh.md            | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 6acbe58..ace353a 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -42,6 +42,8 @@ public static void main(String[] args) {
 
     // Join all of the strings in the list together into a single string separated by commas
     // Use a built-in method to achieve this instead of using a loop
+    String joinedString = String.join(", ", list);
+    System.out.println(joinedString);
 
     // Check whether two strings are equal
 
diff --git a/toRefresh.md b/toRefresh.md
index 7fd2ee7..13dbc3c 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -10,4 +10,5 @@ As you work through this exercise, write down anything that you needed to look u
 - Collections.sort()
 - Arrays vs Lists
 - traditional for-loop for arrays
-- charAt() to return the character at index
\ No newline at end of file
+- charAt() to return the character at index
+- .join() to join strings seperated by commas
\ No newline at end of file

From ba695b48bc78c5801555b07250eb795b7e0d58eb Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 14:54:13 -0700
Subject: [PATCH 31/60] Check if strings are equal

---
 src/StringPractice.java | 5 ++++-
 toRefresh.md            | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index ace353a..4378ecf 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -23,7 +23,7 @@ public static void main(String[] args) {
     } else {
       System.out.println("False");
     }
-
+    
     // Iterate over the characters of the string, printing each one on a separate line
     for (int i = 0; i < newWord.length(); i++){
       char c = newWord.charAt(i);
@@ -46,6 +46,9 @@ public static void main(String[] args) {
     System.out.println(joinedString);
 
     // Check whether two strings are equal
+    String s = list.get(1);
+    String s2 = list.get(2);
+    System.out.println(s.equals(s2));
 
     /*
      * Reminder!
diff --git a/toRefresh.md b/toRefresh.md
index 13dbc3c..0a06ed0 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -11,4 +11,5 @@ As you work through this exercise, write down anything that you needed to look u
 - Arrays vs Lists
 - traditional for-loop for arrays
 - charAt() to return the character at index
-- .join() to join strings seperated by commas
\ No newline at end of file
+- .join() to join strings seperated by commas
+- .equals() syntax
\ No newline at end of file

From 58ebbf0bf03dbf9c14757dc9997e79ae559c3443 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:06:57 -0700
Subject: [PATCH 32/60] Edit code on line 27, if string contains substring

---
 src/StringPractice.java | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/StringPractice.java b/src/StringPractice.java
index 4378ecf..c5d18c9 100644
--- a/src/StringPractice.java
+++ b/src/StringPractice.java
@@ -18,12 +18,14 @@ public static void main(String[] args) {
     System.out.println(newWord.charAt(3));
 
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
-    if (newWord.contains("Nov")){
-      System.out.println("True");
-    } else {
-      System.out.println("False");
-    }
-    
+    // if (newWord.contains("Nov")){
+    //   System.out.println("True");
+    // } else {
+    //   System.out.println("False");
+    // }
+
+    System.out.println(newWord.contains("Nov"));
+
     // Iterate over the characters of the string, printing each one on a separate line
     for (int i = 0; i < newWord.length(); i++){
       char c = newWord.charAt(i);

From 1caadcf8a4ac877852ce1c7d772346ae87cf3f05 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:10:13 -0700
Subject: [PATCH 33/60] Created HashSet

---
 src/SetPractice.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/SetPractice.java b/src/SetPractice.java
index d2fc1c9..94f54a3 100644
--- a/src/SetPractice.java
+++ b/src/SetPractice.java
@@ -1,6 +1,9 @@
+import java.util.*;
+
 public class SetPractice {
   public static void main(String[] args) {
     // Create a HashSet of Strings and assign it to a variable of type Set
+    Set<String> set = new HashSet<>();
 
     // Add 3 elements to the set
     // (It's OK to do it one-by-one)

From 3215d8251daa8d8014deeae45d2270b509fbf261 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:13:36 -0700
Subject: [PATCH 34/60] add 3 elements to set

---
 src/SetPractice.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/SetPractice.java b/src/SetPractice.java
index 94f54a3..b6a11a9 100644
--- a/src/SetPractice.java
+++ b/src/SetPractice.java
@@ -7,6 +7,10 @@ public static void main(String[] args) {
 
     // Add 3 elements to the set
     // (It's OK to do it one-by-one)
+    set.add("Pen");
+    set.add("Pencil");
+    set.add("Eraser");
+    System.out.println(set);
 
     // Check whether the Set contains a given String
 

From c9bb46cb81074cd23ced546245281e4d3c719e01 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:14:52 -0700
Subject: [PATCH 35/60] check if set contains certain string

---
 src/SetPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/SetPractice.java b/src/SetPractice.java
index b6a11a9..93c6c1c 100644
--- a/src/SetPractice.java
+++ b/src/SetPractice.java
@@ -13,6 +13,7 @@ public static void main(String[] args) {
     System.out.println(set);
 
     // Check whether the Set contains a given String
+      System.out.println(set.contains("Pen"));
 
     // Remove an element from the Set
 

From 836a624ecc6411286131e0b500fe7b816e89ff31 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:18:02 -0700
Subject: [PATCH 36/60] Removed element from set

---
 src/SetPractice.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/SetPractice.java b/src/SetPractice.java
index 93c6c1c..16b6b16 100644
--- a/src/SetPractice.java
+++ b/src/SetPractice.java
@@ -13,9 +13,11 @@ public static void main(String[] args) {
     System.out.println(set);
 
     // Check whether the Set contains a given String
-      System.out.println(set.contains("Pen"));
+    System.out.println(set.contains("Pen"));
 
     // Remove an element from the Set
+    System.out.println(set.remove("Eraser"));
+    System.out.println(set);
 
     // Get the size of the Set
 

From 2376040d0cc2cb0237c397bf29c65153376ced42 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:19:07 -0700
Subject: [PATCH 37/60] Get size of set

---
 src/SetPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/SetPractice.java b/src/SetPractice.java
index 16b6b16..a30b980 100644
--- a/src/SetPractice.java
+++ b/src/SetPractice.java
@@ -20,6 +20,7 @@ public static void main(String[] args) {
     System.out.println(set);
 
     // Get the size of the Set
+    System.out.println(set.size());
 
     // Iterate over the elements of the Set, printing each one on a separate line
 

From a3b8d6efcdfdd7132fc3833c0d6d46c28f88b4b6 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:21:59 -0700
Subject: [PATCH 38/60] Iterate the set, updated toRefresh

---
 src/SetPractice.java | 3 +++
 toRefresh.md         | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/SetPractice.java b/src/SetPractice.java
index a30b980..c9c3270 100644
--- a/src/SetPractice.java
+++ b/src/SetPractice.java
@@ -23,6 +23,9 @@ public static void main(String[] args) {
     System.out.println(set.size());
 
     // Iterate over the elements of the Set, printing each one on a separate line
+    for (String str : set) {
+      System.out.println(str);
+    }
 
     /*
      * Warning!
diff --git a/toRefresh.md b/toRefresh.md
index 0a06ed0..ab0023c 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -12,4 +12,5 @@ As you work through this exercise, write down anything that you needed to look u
 - traditional for-loop for arrays
 - charAt() to return the character at index
 - .join() to join strings seperated by commas
-- .equals() syntax
\ No newline at end of file
+- .equals() syntax
+- iterate a HashSet
\ No newline at end of file

From a61b1edb4cf2d5a001942f87de0bbbd23c8a6a9f Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:26:20 -0700
Subject: [PATCH 39/60] Created HashMap with String, Integer

---
 src/MapPractice.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index 7ebfeac..a83dca9 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -1,9 +1,10 @@
-
+import java.util.*;
 
 public class MapPractice {
   public static void main(String[] args) {
     // Create a HashMap with String keys and Integer values and
     // assign it to a variable of type Map
+    Map<String, Integer> dict = new HashMap<>();
 
     // Put 3 different key/value pairs in the Map
     // (it's OK to do this one-by-one)

From 3ec09255d5f2baec6a15abc9c94a865dadecf9b7 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:33:16 -0700
Subject: [PATCH 40/60] Added key/value pairs in Map, updated toRefresh

---
 src/MapPractice.java | 4 ++++
 toRefresh.md         | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index a83dca9..ad89e37 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -8,6 +8,10 @@ public static void main(String[] args) {
 
     // Put 3 different key/value pairs in the Map
     // (it's OK to do this one-by-one)
+    dict.put("Pooh", 1);
+    dict.put("Tigger", 3);
+    dict.put("Eeyore", 6);
+    System.out.println(dict);
 
     // Get the value associated with a given key in the Map
 
diff --git a/toRefresh.md b/toRefresh.md
index ab0023c..3affe30 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -13,4 +13,5 @@ As you work through this exercise, write down anything that you needed to look u
 - charAt() to return the character at index
 - .join() to join strings seperated by commas
 - .equals() syntax
-- iterate a HashSet
\ No newline at end of file
+- iterate a HashSet
+- .put() for Maps
\ No newline at end of file

From 1be48c5e43942e005176ceb3e993ec3ae97260c8 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:39:48 -0700
Subject: [PATCH 41/60] Get value to a give key, updated toRefresh

---
 src/MapPractice.java | 1 +
 toRefresh.md         | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index ad89e37..72f5c10 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -14,6 +14,7 @@ public static void main(String[] args) {
     System.out.println(dict);
 
     // Get the value associated with a given key in the Map
+    System.out.println(dict.get("Eeyore"));
 
     // Find the size (number of key/value pairs) of the Map
 
diff --git a/toRefresh.md b/toRefresh.md
index 3affe30..2a00bc6 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -14,4 +14,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .join() to join strings seperated by commas
 - .equals() syntax
 - iterate a HashSet
-- .put() for Maps
\ No newline at end of file
+- .put() for Maps
+- .get() access an item in HashMap
\ No newline at end of file

From 76e8a2435c349d3a51dd8fa04a17d8067060f810 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:41:48 -0700
Subject: [PATCH 42/60] Find size of map

---
 src/MapPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index 72f5c10..e52f361 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -17,6 +17,7 @@ public static void main(String[] args) {
     System.out.println(dict.get("Eeyore"));
 
     // Find the size (number of key/value pairs) of the Map
+    System.out.println(dict.size());
 
     // Replace the value associated with a given key (the size of the Map shoukld not change)
 

From 8d547ec1e89a5836dea38bf91a43a8069f514a67 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:48:14 -0700
Subject: [PATCH 43/60] Replaced value with given key, updated toRefresh

---
 src/MapPractice.java | 2 ++
 toRefresh.md         | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index e52f361..bde1daa 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -20,6 +20,8 @@ public static void main(String[] args) {
     System.out.println(dict.size());
 
     // Replace the value associated with a given key (the size of the Map shoukld not change)
+    dict.replace("Pooh", 9);
+    System.out.println(dict);
 
     // Check whether the Map contains a given key
 
diff --git a/toRefresh.md b/toRefresh.md
index 2a00bc6..28e6825 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -15,4 +15,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .equals() syntax
 - iterate a HashSet
 - .put() for Maps
-- .get() access an item in HashMap
\ No newline at end of file
+- .get() access an item in HashMap
+- HashMap ordering
\ No newline at end of file

From 15a6bd911f43afdcd4c2595057c75fa208bb2ad8 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:49:55 -0700
Subject: [PATCH 44/60] Check map if contains given key

---
 src/MapPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index bde1daa..15486ed 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -24,6 +24,7 @@ public static void main(String[] args) {
     System.out.println(dict);
 
     // Check whether the Map contains a given key
+    System.out.println(dict.containsKey("Tigger"));
 
     // Check whether the Map contains a given value
 

From 15b8f6f1738a0c948a989f29950fc127d7d8842d Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:51:10 -0700
Subject: [PATCH 45/60] Check map if contains given value

---
 src/MapPractice.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index 15486ed..878a9a9 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -27,6 +27,7 @@ public static void main(String[] args) {
     System.out.println(dict.containsKey("Tigger"));
 
     // Check whether the Map contains a given value
+    System.out.println(dict.containsValue(9));
 
     // Iterate over the keys of the Map, printing each key
 

From 45f4481d807153fe79389ade5fd4106ad2fba88e Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:54:22 -0700
Subject: [PATCH 46/60] Iterate keys of Map, updated toRefresh

---
 src/MapPractice.java | 3 +++
 toRefresh.md         | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index 878a9a9..9ab1d4a 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -30,6 +30,9 @@ public static void main(String[] args) {
     System.out.println(dict.containsValue(9));
 
     // Iterate over the keys of the Map, printing each key
+    for (String str : dict.keySet()){
+      System.out.println(str);
+    }
 
     // Iterate over the values of the map, printing each value
 
diff --git a/toRefresh.md b/toRefresh.md
index 28e6825..e8ca5f2 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -16,4 +16,5 @@ As you work through this exercise, write down anything that you needed to look u
 - iterate a HashSet
 - .put() for Maps
 - .get() access an item in HashMap
-- HashMap ordering
\ No newline at end of file
+- HashMap ordering
+- iterate a HashMap 
\ No newline at end of file

From 1f89273f1b901addcbae89a9e20e8184ad2e2735 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 15:55:55 -0700
Subject: [PATCH 47/60] Iterate values in map

---
 src/MapPractice.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index 9ab1d4a..f1d6e72 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -35,6 +35,9 @@ public static void main(String[] args) {
     }
 
     // Iterate over the values of the map, printing each value
+    for (int v : dict.values()){
+      System.out.println(v);
+    }
 
     // Iterate over the entries in the map, printing each key and value
 

From 15dec6cfb1b0d920a22c3703885e1c1ec71468c8 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:00:54 -0700
Subject: [PATCH 48/60] Iterate over key/value pairs, updated toRefresh

---
 src/MapPractice.java | 3 +++
 toRefresh.md         | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/MapPractice.java b/src/MapPractice.java
index f1d6e72..76dcafe 100644
--- a/src/MapPractice.java
+++ b/src/MapPractice.java
@@ -40,6 +40,9 @@ public static void main(String[] args) {
     }
 
     // Iterate over the entries in the map, printing each key and value
+    for (String s : dict.keySet()){
+      System.out.println("Key: " + s + ", Value: " + dict.get(s));
+    }
 
     /*
      * Usage tip!
diff --git a/toRefresh.md b/toRefresh.md
index e8ca5f2..603d10b 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -17,4 +17,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .put() for Maps
 - .get() access an item in HashMap
 - HashMap ordering
-- iterate a HashMap 
\ No newline at end of file
+- iterate a HashMap 
+- print both keys and values in Hashmap 
\ No newline at end of file

From 7783699a79408e276ba650abfd43ae3224b296c5 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:11:26 -0700
Subject: [PATCH 49/60] Declared instance variables

---
 src/Person.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Person.java b/src/Person.java
index 8ab3f95..17dda2c 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -6,6 +6,8 @@
 public class Person {
   // Declare a public String instance variable for the name of the person
   // Declare a private int instance variable for the age of the person
+    public String name;
+    private int age;
 
 
   // Create a constructor that takes the name and age of the person

From c1f3dd49c0985f3bf0a55fddfd1260afbdfd53b8 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:20:22 -0700
Subject: [PATCH 50/60] Created constructor, updated toRefresh

---
 src/Person.java | 8 +++++---
 toRefresh.md    | 3 ++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/Person.java b/src/Person.java
index 17dda2c..c9b4077 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -9,13 +9,15 @@ public class Person {
     public String name;
     private int age;
 
-
   // Create a constructor that takes the name and age of the person
   // and assigns it to the instance variables
-
+    public Person(String name, int age) {
+      this.name = name;
+      this.age = age;
+    }
 
   // Create a toString method that gives the name and age of the person
-
+    
 
   // Implement the below public instance method "birthYear"
   // There should NOT be any print statement in this method.
diff --git a/toRefresh.md b/toRefresh.md
index 603d10b..ea7e6af 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -18,4 +18,5 @@ As you work through this exercise, write down anything that you needed to look u
 - .get() access an item in HashMap
 - HashMap ordering
 - iterate a HashMap 
-- print both keys and values in Hashmap 
\ No newline at end of file
+- print both keys and values in Hashmap 
+- creating a constructor 
\ No newline at end of file

From c973a11ab3dab9447cedae4803a1b74d22841233 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:23:00 -0700
Subject: [PATCH 51/60] Created toString, updated toRefresh

---
 src/Person.java | 4 +++-
 toRefresh.md    | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Person.java b/src/Person.java
index c9b4077..536bd5d 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -17,7 +17,9 @@ public Person(String name, int age) {
     }
 
   // Create a toString method that gives the name and age of the person
-    
+    public String toString() {
+      return "Name: " + name + " Age: " + age;
+    }
 
   // Implement the below public instance method "birthYear"
   // There should NOT be any print statement in this method.
diff --git a/toRefresh.md b/toRefresh.md
index ea7e6af..b3ac520 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -19,4 +19,5 @@ As you work through this exercise, write down anything that you needed to look u
 - HashMap ordering
 - iterate a HashMap 
 - print both keys and values in Hashmap 
-- creating a constructor 
\ No newline at end of file
+- creating a constructor 
+- creating toString()
\ No newline at end of file

From c482443e2900b4a03cf87e8fe4543c5c899f5b38 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:31:45 -0700
Subject: [PATCH 52/60] Created birthYear method

---
 src/Person.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Person.java b/src/Person.java
index 536bd5d..904dcdf 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -34,6 +34,10 @@ public String toString() {
    * @return The year the person was born
    */
   // (create the instance method here)
+    public int birthYear(int currentYear) {
+      int birthYear = currentYear - age;
+      return birthYear;
+    }
 
 
   public static void main(String[] args) {

From c12ae7a580d886698e464580f596b4ce7dc3b610 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:37:49 -0700
Subject: [PATCH 53/60] Created an instance of Person

---
 src/Person.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Person.java b/src/Person.java
index 904dcdf..8cc666d 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -42,6 +42,7 @@ public int birthYear(int currentYear) {
 
   public static void main(String[] args) {
     // Create an instance of Person
+    Person p1 = new Person("Harry Potter", 27);
 
     // Create another instance of Person with a different name and age and
     // assign it to a different variable

From 686ff427eaca64e28c60285b1d8120ac8ed36240 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:40:01 -0700
Subject: [PATCH 54/60] Created second intance of Person

---
 src/Person.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Person.java b/src/Person.java
index 8cc666d..2fcc4c5 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -46,6 +46,7 @@ public static void main(String[] args) {
 
     // Create another instance of Person with a different name and age and
     // assign it to a different variable
+    Person p2 = new Person("Ron Weasley", 28);
 
     // Print the first person
 

From 69432e75a3619412bfd551b6525855018017b265 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:40:51 -0700
Subject: [PATCH 55/60] Print first person

---
 src/Person.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Person.java b/src/Person.java
index 2fcc4c5..c66670d 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -49,6 +49,7 @@ public static void main(String[] args) {
     Person p2 = new Person("Ron Weasley", 28);
 
     // Print the first person
+    System.out.println(p1);
 
     // Print the second person
 

From c976449451b08255050ada44732cd43dd802b736 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:41:36 -0700
Subject: [PATCH 56/60] Print second person

---
 src/Person.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Person.java b/src/Person.java
index c66670d..a614053 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -52,6 +52,7 @@ public static void main(String[] args) {
     System.out.println(p1);
 
     // Print the second person
+    System.out.println(p2);
 
     // Get the name of the first person and store it in a local variable
 

From e48dc705a3e4f6a264771a390b84ba28bfe0e43d Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 16:44:54 -0700
Subject: [PATCH 57/60] Store first person's name in variable

---
 src/Person.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Person.java b/src/Person.java
index a614053..529f934 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -55,6 +55,7 @@ public static void main(String[] args) {
     System.out.println(p2);
 
     // Get the name of the first person and store it in a local variable
+    String name1 = p1.name;
 
     // Using the birthYear method, get the birth year of the first person
     // and store it in a local variable. Input the actual current year (e.g. 2025)

From 8272fcd7526e18459c0e29d6d03623540ba8c5ee Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 17:04:22 -0700
Subject: [PATCH 58/60] Find the persons birth year using method

---
 src/Person.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Person.java b/src/Person.java
index 529f934..69898cd 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -56,10 +56,13 @@ public static void main(String[] args) {
 
     // Get the name of the first person and store it in a local variable
     String name1 = p1.name;
+    //System.out.println(name1);
 
     // Using the birthYear method, get the birth year of the first person
     // and store it in a local variable. Input the actual current year (e.g. 2025)
     // as the argument.
+    int age1 = p1.age;
+    int birthYear1 = p1.birthYear(2025);
 
     // In a separate statement, print the local variable holding the birth year.
 

From 05b34b86bef5f7404151e5c5b217cd1e21516519 Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 17:08:19 -0700
Subject: [PATCH 59/60] Print first persons birth year, updated toRefresh

---
 src/Person.java | 1 +
 toRefresh.md    | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Person.java b/src/Person.java
index 69898cd..8846a16 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -65,6 +65,7 @@ public static void main(String[] args) {
     int birthYear1 = p1.birthYear(2025);
 
     // In a separate statement, print the local variable holding the birth year.
+    System.out.println(birthYear1);
 
     /**
      * Terminology!
diff --git a/toRefresh.md b/toRefresh.md
index b3ac520..0761090 100644
--- a/toRefresh.md
+++ b/toRefresh.md
@@ -20,4 +20,5 @@ As you work through this exercise, write down anything that you needed to look u
 - iterate a HashMap 
 - print both keys and values in Hashmap 
 - creating a constructor 
-- creating toString()
\ No newline at end of file
+- creating toString()
+- review Java OOP 
\ No newline at end of file

From e606dbc8a8a1b2e3ef8f4c83688b7eb51d1cf8aa Mon Sep 17 00:00:00 2001
From: Lilian <210286008+liliann19@users.noreply.github.com>
Date: Wed, 1 Oct 2025 17:11:57 -0700
Subject: [PATCH 60/60] Reviewed code and edited some

---
 src/Person.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Person.java b/src/Person.java
index 8846a16..30045da 100644
--- a/src/Person.java
+++ b/src/Person.java
@@ -56,12 +56,12 @@ public static void main(String[] args) {
 
     // Get the name of the first person and store it in a local variable
     String name1 = p1.name;
-    //System.out.println(name1);
+    System.out.println(name1);
 
     // Using the birthYear method, get the birth year of the first person
     // and store it in a local variable. Input the actual current year (e.g. 2025)
     // as the argument.
-    int age1 = p1.age;
+    //int age1 = p1.age; - don't need this
     int birthYear1 = p1.birthYear(2025);
 
     // In a separate statement, print the local variable holding the birth year.