ava is an object-oriented language and as said everything in java is an
object. But what about the primitives? They are sort of left out in the
world of objects, that is, they cannot participate in the object
activities, such as being returned from a method as an object, and being
added to a Collection of objects, etc. . As a solution to this problem,
Java allows you to include the primitives in the family of objects by
using what are called wrapper classes.
There is a wrapper class for every primitive date type in Java. This class encapsulates a single value for the primitive data type. For instance the wrapper class for int is Integer, for float is Float, and so on. Remember that the primitive name is simply the lowercase name of the wrapper except for char, which maps to Character, and int, which maps to Integer.
The wrapper classes in the Java API serve two primary purposes:
There is a wrapper class for every primitive date type in Java. This class encapsulates a single value for the primitive data type. For instance the wrapper class for int is Integer, for float is Float, and so on. Remember that the primitive name is simply the lowercase name of the wrapper except for char, which maps to Character, and int, which maps to Integer.
The wrapper classes in the Java API serve two primary purposes:
- To provide a mechanism to “wrap” primitive values in an object so that the primitives can be included in activities reserved for objects, like as being added to Collections, or returned from a method with an object return value. more...
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