finish assigment

src/ArrayPractice.java

@@ -1,18 +1,30 @@
 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
+    stringArray[0]= "one";
+    stringArray[1]="Two";
+    stringArray[2]="Three";
+    stringArray[3]="Four";
     // It's OK to do this one-by-one
 
     // Get the value of the array at index 2
+    System.out.println("Value at index 2: " + stringArray[2]);
 
     // Get the length of the array
+    System.out.println("Length of the array: " + 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("Element of index :" + i + ": " +stringArray);
+    }
     // Iterate over the array using a for-each loop and print out each item
-
+    System.out.println("for-each loop: ");
+    for(String number: stringArray ){
+      System.out.println(number);
+    }
     /*
      * Reminder!
      * 

src/ListPractice.java

@@ -1,28 +1,44 @@
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
 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> stringList = new ArrayList<>();
     // Add 3 elements to the list (OK to do one-by-one)
+    stringList.add("Apple");
+        stringList.add("Banana");
+        stringList.add("Cherry");
 
     // Print the element at index 1
+    System.out.println("Element at index 1: " + 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, "Blueberry");
     // Insert a new element at index 0 (the length of the list will change)
-
+    stringList.add(0, "Avocado");
     // Check whether the list contains a certain string
-
+    boolean containsCherry = stringList.contains("Cherry");
+        System.out.println("Does the list contain 'Cherry'? " + containsCherry);
     // Iterate over the list using a traditional for-loop.
     // Print each index and value on a separate line
-
+    System.out.println("\nTraditional for-loop:");
+        for (int i = 0; i < stringList.size(); i++) {
+            System.out.println("Index " + i + ": " + stringList.get(i));
+        }
     // Sort the list using the Collections library
-
+         Collections.sort(stringList);
+        System.out.println("\nSorted list: " + stringList);
     // Iterate over the list using a for-each loop
     // Print each value on a second line
-
+    System.out.println("\nFor-each loop:");
+    for (String fruit : stringList) {
+        System.out.println(fruit);
+    }
     /*
      * Usage tip!
      * 

src/MapPractice.java

@@ -1,29 +1,49 @@
-
+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
-
-    // Put 3 different key/value pairs in the Map
-    // (it's OK to do this one-by-one)
-
-    // Get the value associated with a given key in the Map
-
-    // 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)
-
-    // Check whether the Map contains a given key
-
-    // Check whether the Map contains a given value
-
-    // Iterate over the keys of the Map, printing each key
-
-    // Iterate over the values of the map, printing each value
-
-    // Iterate over the entries in the map, printing each key and value
-
+    // Create a HashMap with String keys and Integer values and assign it to a variable of type Map
+        Map<String, Integer> map = new HashMap<>();
+
+        // Put 3 different key/value pairs in the Map (it's OK to do this one-by-one)
+        map.put("Apple", 5);
+        map.put("Banana", 3);
+        map.put("Cherry", 8);
+
+        // Get the value associated with a given key in the Map
+        System.out.println("Value associated with 'Banana': " + map.get("Banana"));
+
+        // Find the size (number of key/value pairs) of the Map
+        System.out.println("Size of the map: " + map.size());
+
+        // Replace the value associated with a given key (the size of the Map should not change)
+        map.put("Banana", 6);
+        System.out.println("Updated value for 'Banana': " + map.get("Banana"));
+
+        // Check whether the Map contains a given key
+        System.out.println("Does the map contain key 'Apple'? " + map.containsKey("Apple"));
+
+        // Check whether the Map contains a given value
+        System.out.println("Does the map contain value 8? " + map.containsValue(8));
+
+        // Iterate over the keys of the Map, printing each key
+        System.out.println("\nKeys in the map:");
+        for (String key : map.keySet()) {
+            System.out.println(key);
+        }
+
+        // Iterate over the values of the map, printing each value
+        System.out.println("\nValues in the map:");
+        for (Integer value : map.values()) {
+            System.out.println(value);
+        }
+
+        // Iterate over the entries in the map, printing each key and value
+        System.out.println("\nEntries in the map:");
+        for (Map.Entry<String, Integer> entry : map.entrySet()) {
+            System.out.println(entry.getKey() + ": " + entry.getValue());
+        }
     /*
      * Usage tip!
      * 

src/NumberPractice.java

@@ -1,18 +1,27 @@
 public class NumberPractice {
   public static void main(String args[]) {
     // Create a float with a negative value and assign it to a variable
+    float negativeFloat = -7.5f;
 
     // Create an int with a positive value and assign it to a variable
+    int positiveInt = 10;
 
     // Use the modulo % operator to find the remainder when the int is divided by 3
+    int remainder = positiveInt % 3;
+    System.out.println("Remainder when " + positiveInt + " is divided by 3: " + 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.
+    // Use an if-else to print "Even" if the number is even and "Odd" if the number is odd.
+    if (positiveInt % 2 == 0) {
+        System.out.println(positiveInt + " is Even");
+    } else {
+        System.out.println(positiveInt + " is Odd");
+    }
 
     // Divide the number by another number using integer division
-
+    int divisionResult = positiveInt / 3;
+    System.out.println(positiveInt + " divided by 3 (integer division): " + divisionResult);
     /*
      * Reminder!
      * 

src/Person.java

@@ -5,15 +5,22 @@
 
 public class Person {
   // Declare a public String instance variable for the name of the person
+  public String name;
   // Declare a private int instance variable for the age of the person
-
+  public 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
-
+  @Override
+  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.
@@ -28,26 +35,31 @@ 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 person1 = new Person("Alice", 23);
 
     // Create another instance of Person with a different name and age and
     // assign it to a different variable
-
+    Person person2 = new Person("Bob", 25);
     // Print the first person
-
+    System.out.println(person1);
     // Print the second person
-
+    System.out.println(person2);
     // Get the name of the first person and store it in a local variable
-
+    String personName = person1.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 = person1.birthYear(2025);
 
     // In a separate statement, print the local variable holding the birth year.
-
+    System.out.println(personName + " was born in: " + birthYear);
     /**
      * Terminology!
      * 

src/SetPractice.java

@@ -1,18 +1,33 @@
+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> mySet =new HashSet<>();
     // Add 3 elements to the set
+      mySet.add("Apple");
+    mySet.add("Banana");
+    mySet.add("Cherry");
+
     // (It's OK to do it one-by-one)
 
     // Check whether the Set contains a given String
-
+    boolean containsApple = mySet.contains("Apple");
+    System.out.println("Set contains 'Apple': " + containsApple);
     // Remove an element from the Set
-
+    mySet.remove("Banana");
+    System.out.println("After removing 'Banana': " + mySet);
     // Get the size of the Set
+    int size = mySet.size();
+    System.out.println("The size of the Set is: " + size);
 
-    // Iterate over the elements of the Set, printing each one on a separate line
 
+    // Iterate over the elements of the Set, printing each one on a separate line
+    System.out.println("Set elements:");
+    for (String item : mySet) {
+      System.out.println(item);
+    }
     /*
      * Warning!
      * 

src/StringPractice.java

@@ -1,26 +1,45 @@
+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
+    int length = myString.length();
+    System.out.println("Length of the string: " + length);
 
     // Concatenate (add) two strings together and reassign the result
+    myString = myString + " World";
+    System.out.println("After concatenation: " + myString);
 
     // Find the value of the character at index 3
-
+    char charAtIndex3 = myString.charAt(3);
+    System.out.println("Character at index 3: " + charAtIndex3);
     // Check whether the string contains a given substring (i.e. does the string have "abc" in it?)
-
+    boolean containsSubstring = myString.contains("abc");
+    System.out.println("Contains 'abc': " + containsSubstring);
     // Iterate over the characters of the string, printing each one on a separate line
-
+    System.out.println("Characters in the string:");
+    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> stringList = new ArrayList<>();
     // Add multiple strings to the List (OK to do one-by-one)
-
+    stringList.add("Apple");
+    stringList.add("Banana");
+    stringList.add("Cherry");
     // 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(", ", stringList);
+    System.out.println("Joined string: " + joinedString);
 
     // Check whether two strings are equal
-
+    String string1 = "hello";
+    String string2 = "hello";
+    boolean areEqual = string1.equals(string2);
+    System.out.println("Are the strings equal? " + areEqual);
+
     /*
      * Reminder!
      *