Wrapper objects: The wrapper classes discussed in Chapter 5 also provide you with the abil...

Wrapper objects: The wrapper classes discussed in Chapter 5 also provide you with the ability to instantiate objects that are wrapped versions of primitive variables. For example, to create a wrapped version of the 

double

 number x, you can do this:

double x = 55.0;Double xWrapped = new Double (x)

This instantiates an object of type 

Double,

 which is a wrapped version of the primitive variable, x. Then it assigns a reference to that object to the reference variable, 

xWrapped.

 The 

Double

 class has a number of prebuilt methods that work with 

Double

 objects. You can read about these methods in the Java API documentation on the 

Double

 class. The following program illustrates some of these methods:

/************************************************************** Wrapper.java* Dean&Dean** This program exercises some wrapped primitive numbers.*************************************************************/public class Wrapper {   Public static void main(String[] args)   {     double x = 44.5;     double y = 44.5;     Double xW = new Double(x);	  // the object: wrapped x     Double yW = new Double(y);	  // the object: wrapped y     System.out.println(“object == object? “ + (xW == yW));     System.out.println(“value == value? “ +          (xW.doubleValue( ) == yW.doubleValue( ))) ;     System.out.println(          “object.equals(object)? “ + xW.equals(yW) ) ;     System.out.println(“object.compareTo(object) ? “ +          xW.compareTo (yW) ) ;     yW = new Double(y + 3.0);     System.out.println(“object.compareTo(largerObject) ? “ +          xW.compareTo (yW) ) ;     yW = new Double(Double.NEGATIVE _ INFINITY);     System.out.println(“-infinity isInfinite() ? “ + yW.isInfinite() ) ;  } // end main } // end Wrapper class

Compile and run this program, and display the output. Read about the 

Double

 class in the Java API documentation, and explain why each of the outputs comes out the way it does.