Java primitives-string

exercises/getting-started/com/cbfacademy/HelloWorld.java

@@ -0,0 +1,7 @@
+package com.cbfacademy;
+
+public class HelloWorld {
+    public static void main(String... args) {
+        System.out.println("Hello World!");
+    }
+}

exercises/java-primitives/src/main/java/com/cbfacademy/operators/App.java

@@ -3,29 +3,46 @@
 public class App {
     public static void main(String[] args) {
         System.out.println("Hello World!");
+
+        // Test arithmetic methods
+        System.out.println("Addition: " + add(5.5, 3.2));  // Output: 8.7
+        System.out.println("Subtraction: " + subtract(5.5, 3.2));  // Output: 2.3
+        System.out.println("Multiplication: " + multiply(5.5, 3.2));  // Output: 17.6
+
+        // Test relational methods
+        System.out.println("Are Equal: " + areEqual(5.5, 5.5));  // Output: true
+        System.out.println("Is Less Than: " + isLessThan(5.5, 3.2));  // Output: false
+        System.out.println("Is More Than: " + isMoreThan(5.5, 3.2));  // Output: true
+
+        // Test unary operators
+        int number1 = 12;
+        int number2 = 12;
+
+        System.out.println(number1++);  // Output: 12
+        System.out.println(++number2);  // Output: 13
     }
 
     public static double add(double operand1, double operand2) {
-        throw new RuntimeException("Not implemented");
+        return operand1 + operand2;  // Add operand1 and operand2
     }
 
     public static double subtract(double operand1, double operand2) {
-        throw new RuntimeException("Not implemented");
+        return operand1 - operand2;  // Subtract operand2 from operand1
     }
 
     public static double multiply(double operand1, double operand2) {
-        throw new RuntimeException("Not implemented");
+        return operand1 * operand2;  // Multiply operand1 and operand2
     }
 
     public static Boolean areEqual(double operand1, double operand2) {
-        throw new RuntimeException("Not implemented");
+        return operand1 == operand2;  // Check if operand1 is equal to operand2
     }
 
     public static Boolean isLessThan(double operand1, double operand2) {
-        throw new RuntimeException("Not implemented");
+        return operand1 < operand2;  // Check if operand1 is less than operand2
     }
 
     public static Boolean isMoreThan(double operand1, double operand2) {
-        throw new RuntimeException("Not implemented");
+        return operand1 > operand2;  // Check if operand1 is greater than operand2
     }
 }

exercises/java-primitives/src/main/java/com/cbfacademy/strings/App.java

@@ -1,22 +1,26 @@
 package com.cbfacademy.strings;
 
 public class App {
-    public static void main( String[] args ) {
-        System.out.println( "Hello World!" );
+    public static void main(String[] args) {
+        // Example test cases to verify functionality
+        System.out.println(concatenate("Hello", "World", "Java")); // Output: HelloWorldJava
+        System.out.println(areEqual("Test", "Test")); // Output: true
+        System.out.println(areEqual("Test", "test")); // Output: false
+        System.out.println(format("Apple iPhone 15 Pro", 47, 1199.99)); // Output: Item: Apple iPhone 15 Pro. Price: £1199.99. Quantity: 47
     }
 
     public static String concatenate(String word1, String word2, String word3) {
-        // TODO: Write code that concatenates the input parameters and returns the result
-        throw new RuntimeException("Not implemented");
+        // Concatenates the input strings and returns the result
+        return word1 + word2 + word3;
     }
 
     public static Boolean areEqual(String word1, String word2) {
-        // TODO: Write code to determine whether the input parameters are equal strings
-        throw new RuntimeException("Not implemented");
+        // Compares the two strings and returns true if they are equal (case-sensitive)
+        return word1.equals(word2);
     }
 
     public static String format(String item, int quantity, double price) {
-        // TODO: Write code to return a string formatted as follows: "Item: [item]. Price: £[price]. Quantity: [quantity]". The price should be formatted to two decimal places, e.g. 99.99
-        throw new RuntimeException("Not implemented");
+        // Formats the string with item, price with £ symbol, and quantity
+        return String.format("Item: %s. Price: £%.2f. Quantity: %d", item, price, quantity);
     }
 }