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  Tutorial: Java General Java Assertions in Java Tutorial

This article describes how assertion works in java. This feature is added in JDK1.4. This article also shows how one can enable and disable assertions in Java programs.

Tutorial Details:

Assertions in Java

Assertion facility is added in J2SE 1.4. In order to support this facility J2SE 1.4 added the keyword assert to the language, and AssertionError class. An assertion checks a boolean-typed expression that must be true during program runtime execution. The assertion facility can be enabled or disable at runtime.

Declaring Assertion

Assertion statements have two forms as given below
1. assert expression;
2. assert expression1 : expression2;

The first form is simple form of assertion, while second form takes another expression. In both of the form boolean expression represents condition that must be evaluate to true runtime.

If the condition evaluates to false and assertions are enabled, AssertionError will be thrown at runtime.


 

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