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kalavathi
java
1 Answer(s)      6 years and a month ago
Posted in : Java Interview Questions



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November 25, 2008 at 4:45 AM


Hi friend,

Wrapper class is a wrapper around a primitive data type.
It represents primitive data types in their corresponding class instances e.g. a boolean data type can be represented as a
Boolean class instance. All of the primitive wrapper classes in Java are immutable
i.e. once assigned a value to a wrapper class instance cannot be changed further.

Wrapper Classes are used broadly with Collection classes in the java.util package and
with the classes in the java.lang.reflect reflection package.

* one for each primitive type: Boolean, Byte, Character, Double, Float, Integer, Long, and Short
* Byte, Double, Float, Integer and Short extend the abstract Number class
* all are public final ie cannot be extended
* get around limitations of primitive types
* allow objects to be created from primitive types
*)all, except Character, have a valueOf(String s) method which is equivalent to new Type(String s)
*)all the classes override equals(), hashCode() and toString() in Object
* equals() returns true if the values of the compared objects are the same
* hashCode() returns the same hashcode for objects of the same type having the same value
* toString() returns the string representation of the objects value

For more information,Tutorial and Examples on Wrapper Class visit to :

http://www.roseindia.net/java/wrapper-class/wrapper-classes.shtml

Thanks


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