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Java While Loop Examples

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✅ 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

public class Main {
public static void main(String[] args) {
int i = 1;

while (i <= 10) {
System.out.println(i);
i++;
}
}
}

📌 Example 2: Print Even Numbers

public class Main {
public static void main(String[] args) {
int num = 2;

while (num <= 20) {
System.out.println(num);
num += 2;
}
}
}

📌 Example 3: Reverse Countdown

public class Main {
public static void main(String[] args) {
int countdown = 5;

while (countdown >= 1) {
System.out.println("Time left: " + countdown);
countdown--;
}
}
}

📌 Example 4: Sum of Numbers (1 to 5)

public class Main {
public static void main(String[] args) {
int sum = 0;
int i = 1;

while (i <= 5) {
sum = sum + i;
i++;
}

System.out.println("Sum: " + sum);
}
}

📌 Example 5: Table of a Number

public class Main {
public static void main(String[] args) {
int num = 7;
int i = 1;

while (i <= 10) {
System.out.println(num + " x " + i + " = " + (num * i));
i++;
}
}
}

📌 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.");
}
}

📌 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!");
}
}

🧠 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

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Sanjit Sinha — Web Developer | PHP • Laravel • CodeIgniter • MySQL • Bootstrap Founder, CodeCapsule — Student projects & practical coding guides. Email: info@codecapsule.in • Website: CodeCapsule.in

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