Java While Loop Examples

Here are multiple real-world and practical examples to help you fully understand how while loops work in Java.

Example 1: Print 1 to 10

Example 2: Print Even Numbers

Example 3: Reverse Countdown

Example 4: Sum of Numbers (1 to 5)

Example 5: Table of a Number

Example 6: Stop when user enters 0

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int number;

System.out.println("Enter numbers (Press 0 to stop):");

do {
number = input.nextInt();
} while (number != 0);

System.out.println("Program Ended.");
}
}

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int number;

System.out.println("Enter numbers (Press 0 to stop):");

do {

number = input.nextInt();

} while (number != 0);

System.out.println("Program Ended.");

}

Example 7: While Loop with Condition Check

public class Main {
public static void main(String[] args) {
int password = 1234;
int attempt = 0000;while (attempt != password) {
System.out.println("Wrong password!");
attempt = password; // Simulating input change
}System.out.println("Access Granted!");
}
}

public class Main {

public static void main(String[] args) {

int password = 1234;

int attempt = 0000;while (attempt != password) {

System.out.println("Wrong password!");

attempt = password; // Simulating input change

}System.out.println("Access Granted!");

}

🧠 Summary

Example Type	Purpose
Counting	Basic repetition
Even numbers	Increment patterns
Countdown	Loop backward
Sum	Accumulation
Table	Multiplication logic
User input	Exit condition
Condition check	Validation

Java While Loop Examples