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How Does the do-while Loop Differ from the while Loop in Java?

Ashutosh Patel 479 20-Mar-2025

How Does the do-while Loop Differ from the while Loop in Java?

java java  loop  do-while loop 
Updated on 28-Mar-2025
Ashutosh Patel

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I am a professional .NET developer with over 4 years of hands-on industry experience in designing, developing, and maintaining scalable web applications. I specialize in .NET Core, C#, RESTful APIs, and database-driven systems using SQL Server.

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Khushi Singh

Khushi Singh

28-Mar-2025

The Java programming language contains both while and do-while loop syntax to allow a code segment to be executed based on specified conditions. The main distinction exists in the way these loops check the condition.

A while loop first checks the condition before starting its loop body execution. At the beginning, when the condition turns out to be false, the loop body fails to perform any execution. The unknown number of iterations only depends on this specific condition, so this loop functionality is useful.

In contrast, the do-while loop executes the loop body at least once, regardless of the condition. After the first pass through the loop, the condition will be evaluated and checked. The do-while loop provides a valuable functionality for running a block of code once before evaluating the condition, since it checks after the first execution.

Example: Difference Between while and do-while

public class LoopExample {
   public static void main(String[] args) {
       int count = 5;
       // While loop: Condition checked before execution
       while (count < 5) {
           System.out.println("This will not execute because count is 5.");
       }
       // Do-while loop: Executes at least once
       do {
           System.out.println("This will execute at least once.");
       } while (count < 5);
   }
}

The while loop does not activate because count has reached the value of 5. The executable code block in a do-while loop executes once before the condition evaluation enables at least one execution of the print statement.

The while loop functions best when program execution depends completely on a validating condition, while the do-while loop performs at least one statement execution before conducting validation tests.

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