Turning in what I have

src/ArrayPractice.java

@@ -1,18 +1,25 @@
 public class ArrayPractice {
   public static void main(String[] args) {
     // Create an array of Strings of size 4
-
+    String[] stringArray = 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
-
+    stringArray[0] = "Primus";
+    stringArray[1] = "Secundus";
+    stringArray[2] = "Tertius";
+    stringArray[3] = "Quartus";
     // Get the value of the array at index 2
-
+    System.out.println("The Value of Index 2 is: " + stringArray[2]);
     // Get the length of the array
-
+    System.out.println("The Length of the Array is: " + stringArray.length);
     // Iterate over the array using a traditional for loop and print out each item
-
+    for (int i = 0; i < stringArray.length; i++) {
+      System.out.println(stringArray[i]);
+    }
     // Iterate over the array using a for-each loop and print out each item
-
+    for (String string : stringArray) {
+      System.out.println(string);
+    }
     /*
      * Reminder!
      * 

src/ListPractice.java

@@ -1,23 +1,31 @@
-public class ListPractice {
+import java.util.ArrayList;
 
+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> stringList = new ArrayList<>();
     // Add 3 elements to the list (OK to do one-by-one)
-
+    stringList.add("Primus");
+    stringList.add("Secundus");
+    stringList.add("Tertius");
     // Print the element at index 1
-
+    System.out.println(stringList.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)
-
+    stringList.set(1, stringList.get(0));
+    System.out.println(stringList.get(1));
     // Insert a new element at index 0 (the length of the list will change)
-
+    stringList.add(0, "Zero");
+    System.out.println(stringList.get(0));
     // Check whether the list contains a certain string
-
+    System.out.println(stringList.contains("Zero"));
     // Iterate over the list using a traditional for-loop.
     // Print each index and value on a separate line
-
+    for (int i = 0; i < stringList.size(); i++) {
+      System.out.println("Index: " + i);
+      System.out.println("String: " + stringList.get(i));
+    }
     // Sort the list using the Collections library
 
     // Iterate over the list using a for-each loop
@@ -26,10 +34,12 @@ public static void main(String[] args) {
     /*
      * Usage tip!
      * 
-     * Use a traditional for-loop when you need to use the index or you need to iterate in an
+     * Use a traditional for-loop when you need to use the index or you need to
+     * iterate in an
      * unconventional order (e.g. backwards)
      * 
-     * Otherwise, if you're iterating the in the conventional order and don't need the
+     * Otherwise, if you're iterating the in the conventional order and don't need
+     * the
      * index values a for-each loop is cleaner.
      */
   }

src/MapPractice.java

@@ -1,40 +1,48 @@
-
+import java.util.HashMap;
 
 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
-
+    HashMap<String, Integer> stringMap = new HashMap<>();
     // Put 3 different key/value pairs in the Map
     // (it's OK to do this one-by-one)
-
+    stringMap.put("Primus", 1);
+    stringMap.put("Secundus", 2);
+    stringMap.put("Tertius", 3);
     // Get the value associated with a given key in the Map
-
+    int value = stringMap.get("Secundus");
+    System.out.println("The value pair of the key Secundus is: " + value);
     // Find the size (number of key/value pairs) of the Map
-
-    // Replace the value associated with a given key (the size of the Map shoukld not change)
-
+    System.out.println("The Size of the Map is: " + stringMap.size());
+    // Replace the value associated with a given key (the size of the Map shoukld
+    // not change)
+    System.out.println("Before: " + stringMap);
+    System.out.println(stringMap.replace("Primus", 1, 1000));
+    System.out.println("After: " + stringMap);
     // Check whether the Map contains a given key
-
+    System.out.println(stringMap.containsKey("Tertius"));
     // Check whether the Map contains a given value
-
+    System.out.println(stringMap.containsValue(1000));
     // Iterate over the keys of the Map, printing each key
-
+    System.out.println("The Keys of the Map are: " + stringMap.keySet());
     // Iterate over the values of the map, printing each value
-
+    System.out.println("The Values within the Map are: " + stringMap.values());
     // Iterate over the entries in the map, printing each key and value
-
+    System.out.println("The Key-Value Pairs are: " + stringMap.entrySet());
     /*
      * Usage tip!
      * 
      * Maps are great when you want a specific key to value mapping.
-     * Example: The key could be a person's name, and the value could be their phone number
+     * Example: The key could be a person's name, and the value could be their phone
+     * number
      * 
      * However if your keys are simple ascending 0-indexed integers with no gaps
      * (0, 1, 2, 3, 4...) then an array or List is likely a better choice.
      * Example: If you want to store the order of songs in a playlist.
      * 
-     * If you're finding that you're just wanting to store unordered values and the keys
+     * If you're finding that you're just wanting to store unordered values and the
+     * keys
      * are unimportant, a Set may be a better choice.
      * Example: If you want to hold the student ID numbers of everyone in a course,
      * and you don't care about any ordering.

src/NumberPractice.java

@@ -1,23 +1,33 @@
 public class NumberPractice {
   public static void main(String args[]) {
     // Create a float with a negative value and assign it to a variable
-
+    float negativeNum = -13;
     // Create an int with a positive value and assign it to a variable
-
+    int positiveNum = 13;
     // 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)
     // Use an if-else to print "Even" if the number is even and "Odd"
     // if the number is odd.
+    if (negativeNum % 2 == 0) {
+      System.out.println("Even");
+    } else {
+      System.out.println("Odd");
+    }
 
+    if (positiveNum % 2 == 0) {
+      System.out.println("Even");
+    } else {
+      System.out.println("Odd");
+    }
     // Divide the number by another number using integer division
-
+    System.out.println(negativeNum / 5);
     /*
      * Reminder!
      * 
      * When dividing ints, the result is rounded down.
-     * Example: 
+     * Example:
      * 7 / 3 = 2 when performing int division
      */
 

src/Person.java

@@ -6,14 +6,20 @@
 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
-
+  String publicName;
+  private int privAge;
 
   // 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) {
+    publicName = name;
+    privAge = age;
+  }
 
   // Create a toString method that gives the name and age of the person
-
+  public String toString() {
+    return "Name: " + publicName + " Age: " + privAge;
+  }
 
   // Implement the below public instance method "birthYear"
   // There should NOT be any print statement in this method.
@@ -28,25 +34,32 @@ public class Person {
    * @return The year the person was born
    */
   // (create the instance method here)
+  public int birthYear(int currentYear) {
+
+    int birthYear = currentYear - privAge;
 
+    return birthYear;
+  }
 
   public static void main(String[] args) {
     // Create an instance of Person
-
+    Person firstPerson = new Person("Harold", 32);
     // Create another instance of Person with a different name and age and
     // assign it to a different variable
-
+    Person secondPerson = new Person("Tilda", 53);
     // Print the first person
-
+    System.out.println(firstPerson);
     // Print the second person
-
+    System.out.println(secondPerson);
     // Get the name of the first person and store it in a local variable
-
+    String firstPersonName = firstPerson.publicName;
+    System.out.println("The Name of the First Person: " + firstPersonName);
     // 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 firstPersonBirthYear = firstPerson.birthYear(2025);
     // In a separate statement, print the local variable holding the birth year.
+    System.out.println("The Birth Year of the First Person is: " + firstPersonBirthYear);
 
     /**
      * Terminology!
@@ -55,12 +68,15 @@ public static void main(String[] args) {
      * An instance is a specific object made according to that definition.
      * We use "instance" and "object" to mean the same thing.
      * 
-     * For example, if there is a Person class, we can make an instance of a specific person: Auberon.
+     * For example, if there is a Person class, we can make an instance of a
+     * specific person: Auberon.
      * 
-     * There can be many instances for the same class. For example: Auberon, Xinting, Baya are all
+     * There can be many instances for the same class. For example: Auberon,
+     * Xinting, Baya are all
      * different instances of the Person class.
      * 
-     * Each instance has its own instance variables: Auberon's age can be different from Baya's age.
+     * Each instance has its own instance variables: Auberon's age can be different
+     * from Baya's age.
      */
   }
 }

src/SetPractice.java

@@ -1,26 +1,36 @@
+import java.util.HashSet;
+
 public class SetPractice {
   public static void main(String[] args) {
     // Create a HashSet of Strings and assign it to a variable of type Set
-
+    HashSet<String> stringSet = new HashSet<>();
     // Add 3 elements to the set
     // (It's OK to do it one-by-one)
-
+    stringSet.add("Primus");
+    stringSet.add("Secundus");
+    stringSet.add("Tertius");
     // Check whether the Set contains a given String
-
+    System.out.println(stringSet.contains("Quartus"));
     // Remove an element from the Set
-
+    System.out.println(stringSet);
+    stringSet.remove("Secundus");
+    System.out.println(stringSet);
     // Get the size of the Set
-
+    System.out.println(stringSet.size());
     // Iterate over the elements of the Set, printing each one on a separate line
-
+    for (String str : stringSet) {
+      System.out.println(str);
+    }
     /*
      * Warning!
      * 
      * The iteration order over the items in a HashSet is NOT GUARANTEED.
      * 
-     * Even running the exact same program multiple times may give different results.
+     * Even running the exact same program multiple times may give different
+     * results.
      * Do not use a HashSet if order is important! You can use a TreeSet if you
-     * want items in sorted order, or an array or List if you want them in a specified
+     * want items in sorted order, or an array or List if you want them in a
+     * specified
      * order.
      * 
      * Also remember that sets do NOT have duplicates.

src/StringPractice.java

@@ -1,26 +1,44 @@
+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 string1 = "Primus";
     // Find the length of the string
-
+    System.out.println(string1.length());
     // Concatenate (add) two strings together and reassign the result
+    String string2 = "Secundus";
 
+    String concatenatedString = string1 + string2;
+    System.out.println(concatenatedString);
     // 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?)
-
-    // Iterate over the characters of the string, printing each one on a separate line
-
+    System.out.println(concatenatedString.charAt(3));
+    // Check whether the string contains a given substring (i.e. does the string
+    // have "abc" in it?)
+    if (concatenatedString.contains("abc")) {
+      System.out.println("This String contains abc");
+    } else {
+      System.out.println("This String does not contain abc");
+    }
+    // Iterate over the characters of the string, printing each one on a separate
+    // line
+    char[] charArray = concatenatedString.toCharArray();
+    for (int i = 0; i < charArray.length; i++) {
+      System.out.println(charArray[i]);
+    }
     // Create an ArrayList of Strings and assign it to a variable
-
+    ArrayList<String> stringList = new ArrayList<>();
     // Add multiple strings to the List (OK to do one-by-one)
-
-    // Join all of the strings in the list together into a single string separated by commas
+    stringList.add("Tertius");
+    stringList.add("Quartus");
+    stringList.add("Quintus");
+    // 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.join(", ", stringList);
+    System.out.println(stringList);
     // Check whether two strings are equal
-
+    System.out.println(string1.equals(string2));
     /*
      * Reminder!
      *