Force.com Apex Code Developer's Guide

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Do-While Loops

The Apex​​ do-while loop repeatedly executes a block of code as long as a particular Boolean condition remains true. Its syntax is:
1do {
2   code_block
3} while (condition);

Curly braces ({}) are always required around a code_block.

Note

As in Java, the Apex​​ do-while loop does not check the Boolean condition statement until after the first loop is executed. Consequently, the code block always runs at least once.

As an example, the following code outputs the numbers 1 - 10 into the debug log:
1Integer count = 1;
2
3do {
4    System.debug(count);
5    count++;
6} while (count < 11);