Relational operators in Java - Mini Project: Build & Apply

Relational Operators in Java

📖 Scenario: You are creating a simple program to compare ages of two friends to see who is older or if they are the same age.

🎯 Goal: Build a Java program that uses relational operators to compare two age values and prints the comparison results.

📋 What You'll Learn

Create two integer variables named ageAlice and ageBob with exact values 25 and 30 respectively.

Create a boolean variable named isAliceOlder that stores the result of comparing if Alice is older than Bob.

Create a boolean variable named isBobOlder that stores the result of comparing if Bob is older than Alice.

Create a boolean variable named areSameAge that stores the result of checking if Alice and Bob have the same age.

Print the values of isAliceOlder, isBobOlder, and areSameAge each on a new line.

💡 Why This Matters

🌍 Real World

Comparing values is common in real life, like checking if someone is old enough to vote or drive.

💼 Career

Understanding relational operators is essential for decision-making in programming, used in conditions and loops.

1

Create age variables

Create two integer variables called ageAlice and ageBob with values 25 and 30 respectively.

Java

// Your code here

Need a hint?

Use int to declare whole number variables and assign the exact values.

2

Create relational boolean variables

Create boolean variables isAliceOlder, isBobOlder, and areSameAge that store the results of ageAlice > ageBob, ageBob > ageAlice, and ageAlice == ageBob respectively.

Java

public class Main {
    public static void main(String[] args) {
        int ageAlice = 25;
        int ageBob = 30;
        // Your code here
    }
}

Need a hint?

Use relational operators > and == to compare the ages and store the results in boolean variables.

3

Print the comparison results

Use System.out.println to print the values of isAliceOlder, isBobOlder, and areSameAge each on a new line.

Java

public class Main {
    public static void main(String[] args) {
        int ageAlice = 25;
        int ageBob = 30;
        boolean isAliceOlder = ageAlice > ageBob;
        boolean isBobOlder = ageBob > ageAlice;
        boolean areSameAge = ageAlice == ageBob;
        // Your code here
    }
}

Need a hint?

Use System.out.println to show each boolean result on its own line.

4

Run and check output

Run the program and confirm the output shows false, true, and false each on a new line.

Java

public class Main {
    public static void main(String[] args) {
        int ageAlice = 25;
        int ageBob = 30;
        boolean isAliceOlder = ageAlice > ageBob;
        boolean isBobOlder = ageBob > ageAlice;
        boolean areSameAge = ageAlice == ageBob;
        System.out.println(isAliceOlder);
        System.out.println(isBobOlder);
        System.out.println(areSameAge);
        // No code needed here
    }
}

Need a hint?

The output should be three lines: false, true, and false.