Do-While statement

Overview

do-while statement is a post-test loop. The condition will be evaluated at the tail of loop. This loop will be performed 1 time at least.

do {
    // loop while a equals 0.
} while (a == 0);

Infinite loop

If you put true or non-zero value at the condition, it means infinite loop. break statement is needed to exit an infinite loop.

do {
    // infinite loop.
    if (codition) break;
} while (true);

This is exactly the same as while, therefore you had better use while for readability.

Examples

Example 1. Normal case

Code

var a = 5;
do {
    System.println(a);
} while (a--);

Result

5
4
3
2
1
0

Example 2. Infinaite loop

Code

var i = 0;
do {
    if (i > 1000) break;
    ++i;
} while (true);
System.println(i);

Result

1001