More Complex Assertions : Assertions « Development « Java Tutorial

assert logical_expression : string_expression;

public class MainClass {

  public static void main(String[] arg) {
    int value = 80;
    assert false : "value: " + value;


6.24.2.More Complex Assertions
6.24.3.Assert with an informative message
6.24.4.Compile 'assert'
6.24.5.A Program with Assertions
6.24.6.Enabling Assertions from the Command Line: -ea and -da enable and disable assertion in a package subtree or in a class.
6.24.7.Handling an Assertion Error
6.24.8.Catch assert exception with message
6.24.9.Using the class loader to enable assertions