Web Reference: Object Wrapper (Java) In Java, there is a class provided in the java.lang package to provide object methods for the eight primitive types. All of the primitive wrapper classes in Java are immutable. So Wrapper classes are used to represent primitive values when an Object is required. May 20, 2009 · A wrapper class (as adapter) is used when the wrapper must respect a particular interface and must support a polymorphic behavior. On the other hand, a facade is used when one wants an easier or simpler interface to work with. 2 Wrapper Class: Java uses primitive types, such as int, char, double to hold the basic data types supported by the language. Sometimes it is required to create an object representation of these primitive types. These are collection classes that deal only with such objects. One needs to wrap the primitive type in a class.
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