Java Reference
In-Depth Information
PackageName... : Assertions are enabled in the specified package and its
subpackages by specifying the package name followed by ... .
... : Assertions are enabled in the unnamed package, which happens to be
whatever directory is current.
ClassName :Assertionsareenabledinthenamedclassbyspecifyingtheclass
For example, you can enable all assertions except system assertions when running
the MergeArrays application via java -ea MergeArrays . Also, you could
enable any assertions in this chapter's logging package by specifying java -
ea:logging TestLogger .
Assertions can be disabled, and also at various granularities, by specifying either of
the -disableassertions or -da command-line options. These options take the
same arguments as -enableassertions and -ea .
Forexample, java -ea -da: loneclass mainclass enables all assertions
exceptforthosein loneclass .( loneclass and mainclass areplaceholdersfor
the actual classes that you specify.)
The previous options apply to all classloaders (discussed in Appendix C). Except
ten desirable.
To enable system assertions, specify either -enablesystemassertions or -
esa ; for example, java -esa -ea:logging TestLogger . Specify either -
disablesystemassertions or -dsa to disable system assertions.
While developing a Java application, you might want to annotate various application
This section introduces you to annotations. After defining this term and presenting
ally, you discover how to process your own annotations to accomplish useful tasks.
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