Java General Java Assertions Tutorial

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Tutorial: Java General Java Assertions Tutorial

An assertion is a statement containing a boolean expression that is assumed to be true when the statement is executed. The system reports an AssertionError if the expression evaluates to false.

Tutorial Details:

Java Assertions

An assertion is a statement containing a boolean expression that is assumed to be true when the statement is executed. The system reports an AssertionError if the expression evaluates to false.

the assertion expression is true if a is negative. If a is positive, an AssertionError is thrown with the message "a is positive."

Assertions are disabled by default. To compile with assertions enabled, you need to use the source 1.4 flag:

javac -source 1.4 Test.java
To enable assertions at runtime, use the -enableassertions or -ea flags.

For selective disabling of assertions at runtime, use the -da or -disableassertions flags.

For enabling assertions in the system classes, use the -esa or -dsa flags. Assertions can also be enabled or disabled on a package basis.

Appropriate and inappropriate use of assertions
You can place an assertion at any location that you don't expect to be reached normally. Assertions can be used to validate the parameters passed to a private method. However, assertions should not be used to validate parameters passed to public methods because a public method must check its arguments regardless of whether assertions are enabled or not.

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