While Loop In Java Program Rating: 6,4/10 1137 votes

The Do/While Loop. The do/while loop is a variant of the while loop. This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true. This Java Example shows how to use do while loop to iterate in Java program. */ public class DoWhileExample { public static void main (String [] args) { /*. Java Do While Loop With Examples – Java Tutoring. Def: ‘Executing a set of statements‘ process is known as looping. We have three types of looping constructs in Java. These looping statements are also called iterative statements. Check out those three Looping statements in Java – Followed Explanation part about java do while with examples and sample program with output. While Loop In Java. The while statement continually executes a block of statements while a particular condition is true. If the expression of while statement evaluates to true, then it executes the statement (s) in the while block. The while statement continues testing the expression and executing its block until the expression evaluates to false. In while loop, condition is evaluated first and if it returns true then the statements inside while loop execute. When condition returns false, the control comes out of loop and jumps to the next statement after while loop.

Java while loop is used to execute statement(s) until a condition is true. In this tutorial, we will learn to use while loop with examples. First of all, let's discuss while loop syntax:

while (condition(s)) {
// Body of loop
}

1. If the condition(s) holds true then the body of the loop is executed, after execution of the loop body condition is tested again and if the condition is still true then the body of the loop is executed again, and the process repeats until the condition(s) becomes false. The condition evaluates to true or false and if it is a constant, for example, while (c) {…}, where c is a constant, then any non zero value of c is considered to be true, and zero is considered false.

2. You can test multiple conditions such as

Loop body is executed till value of variable a is greater than value of variable b and variable c isn't equal to zero.

3. A body of a loop can contain more than one statement. For multiple statements, you need to place them in a block using {}, and if the body of a loop contains only one statement, you can optionally use {}. It is always recommended to use braces to make your program easy to read and understand.

Java while loop example

Following program asks a user to input an integer and prints it until the user enter 0 (zero).

  1. publicstaticvoid main(String[] args){
  2. System.out.println('Input an integer');
  3. while((n = input.nextInt())!=0){
  4. System.out.println('Input an integer');
  5. }

Output of program:

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Java while loop break program

We can write above program using a break statement. We test a user input and if it is zero then we use 'break' to exit or come out of the loop.

  1. publicstaticvoid main(String[] args){
  2. while(true){// Condition in while loop is always true here
  3. n = input.nextInt();
  4. if(n 0){
  5. }
  6. }
  7. }

Java while loop break continue program

  1. publicstaticvoid main(String[] args){
  2. System.out.println('Input an integer');
  3. System.out.println('You entered '+ n);
  4. }
  5. break;
  6. }
  7. }

Continue statement takes the control to the beginning of the loop and body of the loop executes again. Whatever you can do with a while loop can be done with a for loop or a do while loop.

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A do..while loop is similar to a while loop, except that a do..while loop is guaranteed to execute at least one time.

While Loop In Java Program

Syntax

Following is the syntax of a do..while loop −

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Notice that the Boolean expression appears at the end of the loop, so the statements in the loop execute once before the Boolean is tested.

If the Boolean expression is true, the control jumps back up to do statement, and the statements in the loop execute again. This process repeats until the Boolean expression is false.

Flow Diagram

Program

Example

This will produce the following result −

While Loop In Java Programming

Output

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