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user defined wrapper class

 
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What does it mean when somebody says "you can accomplish this by writing a wrapper class". I believe a wrapper class is something that converts from primitive to references/objects.

why is it called wrapper class? how do you define the word wrapper class... wrapper means?
 
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FOLDOC's definition.

The Java classes, such as java.lang.Integer, for holding primitive data are correctly called "wrappers". However, they are not the only thing that can correctly by called a "wrapper". Jay-Z is not involved, however.
 
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