Mastering the Java Do/While Loop: A Comprehensive Guide

Learn about the Java do/while loop, a powerful control structure that guarantees at least one execution of a code block. This guide explains its syntax, behavior compared to the while loop, and practical examples to help you effectively utilize the do/while loop in your Java applications.

Java Do/While Loop

The do/while loop in Java executes a block of code once, and then repeats the loop as long as a specified condition is true. Unlike the while loop, the do/while loop ensures that the code block executes at least once, even if the condition is initially false.

Syntax

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

Example

int i = 0;
do {
System.out.println(i);
i++;
}
while (i < 5);

0
1
2
3
4

Explanation: In this example, the do block executes first, printing the value of i and then incrementing it. The loop continues to execute as long as i is less than 5.

Note: The condition in the while statement is checked after the execution of the do block. This guarantees that the code within the do block executes at least once, regardless of the initial condition's value.