wrapper : Java Glossary


Java won’t let you change a caller’s variable. However, it will let you change the fields inside a caller’s object passed to you as a parameter. To get around the limitation that you can’t change the caller’s variables, (or return multiple values), you create a dummy class. You can then have the caller pass you an object of that dummy class and you fiddle its fields. Alternatively you create such an object, fill in its fields and return it to the caller. That dummy class is called a wrapper. The term is also used for an immutable Integer — a wrapper around an int to turn it into an object. Wrappers are sometimes called holders.

Wrapper has a totally different meaning. If you create a facade or decorator class, that just calls methods from other classes without doing any work itself, that class is called a wrapper.

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