Finished

src/ArrayPractice.java

@@ -1,17 +1,28 @@
 public class ArrayPractice {
   public static void main(String[] args) {
     // Create an array of Strings of size 4
-
+    String[] myArray = new String[4];
     // Set the value of the array at each index to be a different String
+    myArray[0] = "Hello";
+    myArray[1] = "Tissue";
+    myArray[2] = "Phone";
+    myArray[3] = "Cup";
     // It's OK to do this one-by-one
 
     // Get the value of the array at index 2
+    System.out.println(myArray[2]);
 
     // Get the length of the array
-
+    System.out.println("Length of array" + myArray.length);
     // Iterate over the array using a traditional for loop and print out each item
+    for(int i =0; i<myArray.length; i++){
+      System.out.println(myArray[i]);
+    }
 
     // Iterate over the array using a for-each loop and print out each item
+    for(String item: myArray){
+      System.out.println(item);
+    }
 
     /*
      * Reminder!

src/ListPractice.java

@@ -1,28 +1,43 @@
+import java.util.ArrayList; 
+import java.util.Collections; 
 public class ListPractice {
 
 
   public static void main(String[] args) {
     // Create an empty ArrayList of Strings and assign it to a variable of type List
-
+    ArrayList<String> list = new ArrayList<String>();
     // Add 3 elements to the list (OK to do one-by-one)
+    list.add("Hello");
+    list.add("Good");
+    list.add("Node");
 
+    System.out.println("New list: " + 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)
+    list.set(1, "Bad");
+    System.out.println("Updated List: " + list);
 
     // Insert a new element at index 0 (the length of the list will change)
+    list.add(0, "Food");
+    System.out.println("Expected: Food, Hello, Bad, Node    | " + list);
 
     // Check whether the list contains a certain string
-
+    System.out.println(list.contains("Food"));
     // 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++){
+      System.out.println(list.get(i));
+    }
     // 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
-
+    for(String item : list){
+      System.out.println(item);
+    }
     /*
      * Usage tip!
      * 

src/MapPractice.java

@@ -1,28 +1,63 @@
-
+import java.util.HashMap;
+import java.util.Map;
 
 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> myMap = new HashMap<>();
 
     // Put 3 different key/value pairs in the Map
     // (it's OK to do this one-by-one)
+    myMap.put("Alice", 25);
+    myMap.put("Bob", 30);
+    myMap.put("Charlie", 35);
 
     // Get the value associated with a given key in the Map
+    String keyToGet = "Bob";
+    Integer value = myMap.get(keyToGet);
+    System.out.println("Value associated with key '" + keyToGet + "': " + value);
 
     // Find the size (number of key/value pairs) of the Map
+    System.out.println("Size of the map: " + myMap.size());
 
     // Replace the value associated with a given key (the size of the Map shoukld not change)
+    myMap.put("Alice", 26); // Replace the value for key "Alice"
+    System.out.println("Updated value for key 'Alice': " + myMap.get("Alice"));
 
     // Check whether the Map contains a given key
+    String keyToCheck = "Charlie";
+    if (myMap.containsKey(keyToCheck)) {
+        System.out.println("The map contains the key '" + keyToCheck + "'.");
+    } else {
+        System.out.println("The map does not contain the key '" + keyToCheck + "'.");
+    }
 
     // Check whether the Map contains a given value
+    int valueToCheck = 30;
+    if (myMap.containsValue(valueToCheck)) {
+        System.out.println("The map contains the value " + valueToCheck + ".");
+    } else {
+        System.out.println("The map does not contain the value " + valueToCheck + ".");
+    }
 
     // Iterate over the keys of the Map, printing each key
+    System.out.println("Keys in the map:");
+    for (String key : myMap.keySet()) {
+        System.out.println(key);
+    }
 
     // Iterate over the values of the map, printing each value
+    System.out.println("Values in the map:");
+    for (Integer val : myMap.values()) {
+        System.out.println(val);
+    }
 
     // Iterate over the entries in the map, printing each key and value
+    System.out.println("Entries in the map:");
+    for (Map.Entry<String, Integer> entry : myMap.entrySet()) {
+        System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
+    }
 
     /*
      * Usage tip!

src/NumberPractice.java

@@ -1,18 +1,31 @@
 public class NumberPractice {
   public static void main(String args[]) {
     // Create a float with a negative value and assign it to a variable
+    float newFloat = -4.545f;
+    System.out.println(newFloat);
 
     // Create an int with a positive value and assign it to a variable
+    int newInt = 36;
+    System.out.println(newInt);
 
     // Use the modulo % operator to find the remainder when the int is divided by 3
+    float remainder = newInt % 3;
+    System.out.println(remainder);
 
     // 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)
     // Use an if-else to print "Even" if the number is even and "Odd"
     // if the number is odd.
+      if(newInt % 2 == 0){
+        System.out.println("This number is even");
+      }else{
+        System.out.println("This number is odd!");
+      }
 
     // Divide the number by another number using integer division
 
+    int division = newInt / 4;
+    System.out.println(division);
     /*
      * Reminder!
      * 

src/Person.java

@@ -6,14 +6,27 @@
 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
   // 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
+    public String toString(){
+      return "Name of person: " + name + " | Age: " + age;
+    }
 
+    public String getName(){
+      return name;
+    }
+    public int getAge(){
+      return age;
+    }
 
   // Implement the below public instance method "birthYear"
   // There should NOT be any print statement in this method.
@@ -28,26 +41,33 @@ public class Person {
    * @return The year the person was born
    */
   // (create the instance method here)
-
+  public int birthYear(int currentYear){
+    return currentYear - age;
+  }
 
   public static void main(String[] args) {
     // Create an instance of Person
-
+    Person example1 = new Person("Kim", 20);
     // Create another instance of Person with a different name and age and
     // assign it to a different variable
-
+    Person example2 = new Person("Hayden", 19);
     // Print the first person
+    System.out.println(example1);
 
     // Print the second person
+    System.out.println(example2);
 
     // Get the name of the first person and store it in a local variable
+    String name = example1.getName();
+    System.out.println(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)
     // as the argument.
 
+    int birthYear = example1.birthYear(2025);
     // In a separate statement, print the local variable holding the birth year.
-
+    System.out.println(birthYear);
     /**
      * Terminology!
      * 

src/SetPractice.java

@@ -1,17 +1,37 @@
+import java.util.HashSet;
+import java.util.Set;
+
 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> stringSet = new HashSet<>();
 
     // Add 3 elements to the set
     // (It's OK to do it one-by-one)
+    stringSet.add("Apple");
+    stringSet.add("Banana");
+    stringSet.add("Cherry");
 
     // Check whether the Set contains a given String
+    String elementToCheck = "Banana";
+    if (stringSet.contains(elementToCheck)) {
+        System.out.println(elementToCheck + " is in the set.");
+    } else {
+        System.out.println(elementToCheck + " is not in the set.");
+    }
 
     // Remove an element from the Set
+    stringSet.remove("Banana");
+    System.out.println("Banana removed from the set.");
 
     // Get the size of the Set
+    System.out.println("The size: " + stringSet.size());
 
     // Iterate over the elements of the Set, printing each one on a separate line
+    System.out.println("Elements in the set:");
+    for (String element : stringSet) {
+        System.out.println(element);
+    }
 
     /*
      * Warning!

src/StringPractice.java

@@ -1,26 +1,43 @@
+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
-
+    String myString = "hello";
     // Find the length of the string
+    System.out.println("String length: " + myString.length());
 
     // Concatenate (add) two strings together and reassign the result
+    String string2 ="goodbye";
+    String newString = myString + string2;
+    System.out.println(newString);
 
     // Find the value of the character at index 3
+    System.out.println(myString.charAt(3));
 
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
+    System.out.println(myString.contains("abc"));
 
     // Iterate over the characters of the string, printing each one on a separate line
+    for(int i=0; i<myString.length(); i++){
+      System.out.println(myString.charAt(i));
+    }
 
     // Create an ArrayList of Strings and assign it to a variable
+    ArrayList<String> list = new ArrayList<String>();
 
     // Add multiple strings to the List (OK to do one-by-one)
+    list.add("Hello");
+    list.add("Good");
+    list.add("Oui");
 
     // 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
-
+    joinedString.equals(myString);
     /*
      * Reminder!
      *