Stats

69 Contributors: 5
2016-12-22
Licensed under: CC-BY-SA

Not affiliated with Stack Overflow
Rip Tutorial: info@zzzprojects.com

Download eBook

Asserting

Download java eBook

Syntax

  • assert expression1;
  • assert expression1 : expression2;

Parameters

ParameterDetails
expression1The assertion statement throws an AssertionError if this expression evaluates to false.
expression2Optional. When used, AssertionErrors thrown by the assert statement have this message.

Remarks

By default, assertions are disabled at runtime.

To enable assertions, you must run java with -ea flag.

java -ea com.example.AssertionExample

Assertions are statements that will throw an error if their expression evaluates to false. Assertions should only be used to test code; they should never be used in production.

Related Examples