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Control Flow

Do-While Loop in Java

The do-while loop executes a block of code while a boolean expression evaluates to true. It checks the boolean expression after each iteration. It terminates as soon as the expression evaluates to false.

Syntax

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

Notes

Because the do-while loop evaluates the boolean expression at the end of the iteration, the block of code within the loop is guaranteed to run at least once.

booleanExpression results in either a true or false output. It is created using comparing operators (==, >, =, <=, !=).

There can also be multiple boolean expressions within the parentheses (booleanExpression). The boolean expressions are connected through logical operators (&&, ||, !).

Example

int x = 0; 
do { 
    System.out.println(x); 
    x++; 
} while(x < 10);