While Loop Statement in Java

In this tutorial, we are going to learn how to use while loop in Java. I hope you have read Java For-Loop Statement.

In Java, looping statements are used to execute instructions repeatedly when your program meets a certain condition or evaluates to true.

1. Java While Loop Statement:

Java While Loop is used to iterate part of a program repeatedly when the number of iteration is not fixed.

Syntax:

while(condition){  
//code to be executed  
}

Example:

public class DemoClass {
	public static void main(String[] args) {
		int i = 1;
		while (i <= 10) {
			System.out.println(i);
			i++;
		}
	}
}

Output:

1
2
3
4
5
6
7
8
9
10

2. Java Do-While Loop Statement:

Java do-while loop is very similar to simple while loop in Java. But the only difference is “if you want to make a program run at least once” then using do-while loop in Java is recommended.

Syntax:

do{  
//code to be executed  
}
while(condition);

Example:

public class DemoClass {
	public static void main(String[] args) {
		int i = 1;
		do {
			System.out.println(i);
			i++;
		} while (i <= 5);
	}
}

Output:

1
2
3
4
5

3. Frequently Asked Questions:

Can we have infinite while loop?

Yes, we can have an infinite while and do-while loop statement in Java. See below example:

public class DemoClass {
	public static void main(String[] args) {
		while (true) {
			System.out.println("This is an infinite loop");
		}
	}
}

Output:

This is an infinite loop
This is an infinite loop
This is an infinite loop
This is an infinite loop
This is an infinite loop
This is an infinite loop

//need to manually terminate

I hope you’ve understood while loop statement in java