Wrapper class Wrapping and Unwrapping

Java Programming Language / OOPs concept more

6065

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Program:

 
public class WrappingUnwrapping
{
  public static void main(String args[])
  {	
  	  //  data types
    byte grade = 12;
    int marks = 58;
    float price = 9.6f;       	// observe a suffix of f for float
    double rate = 60.5;
 	  // data types to objects
    Byte g1 = new Byte(grade);           // wrapping
    Integer m1 = new Integer(marks);
    Float f1 = new Float(price);
    Double r1 = new Double(rate);
        // let us print the values from objects
    System.out.println("Values of Wrapper objects (printing as objects)");
    System.out.println("Byte object g1:  " + g1);
    System.out.println("Integer object m1:  " + m1);
    System.out.println("Float object f1:  " + f1);
    System.out.println("Double object r1:  " + r1);
	  // objects to data types (retrieving data types from objects)
    byte bv = g1.byteValue();               // unwrapping
    int iv = m1.intValue();
    float fv = f1.floatValue();
    double dv = r1.doubleValue();
       // let us print the values from data types
    System.out.println("Unwrapped values (printing as data types)");
    System.out.println("byte value, bv: " + bv);
    System.out.println("int value, iv: " + iv);
    System.out.println("float value, fv: " + fv);
    System.out.println("double value, dv: " + dv);
  }
}

  

Output:

Values of Wrapper objects (printing as objects)
Byte object g1:  12
Integer object m1:  58
Float object f1:  9.6
Double object r1:  60.5
Unwrapped values (printing as data types)
byte value, bv: 12
int value, iv: 58
float value, fv: 9.6
double value, dv: 60.5
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