Wrappers

[Chetan Dodiya]

this q is from ExamLab

  public class Fex2{
          public static void main(String args[]){
               byte b1=12;
               Byte B1=new Byte(b1);
               short s1=6;
               Short S1=new Short(s1);
               int i1=7;
               Integer I1=new Integer(i1);
               Long l1=new Long(45L);
               Number nm=new Short("4");
     
               capture(b1);
               capture(B1);    //...1
               capture(s1);
               capture(s1+=20000);
               capture(S1);
               capture(nm);
               capture(I1.intValue());
               capture(Short.valueOf("110110",2));
               capture(Short.parseShort("110110",2));
               capture();
          }
     
          static void capture(short x){
               System.out.print("A");
          }
          static void capture(int x){
               System.out.print("B");
          }
          static void capture(long x){
               System.out.print("C");
          }
          static void capture(Short x){
               System.out.print("D");
          }
          static void capture(Integer x){
               System.out.print("E");
          }
          static void capture(Long... x){
               System.out.print("F");
          }
          static void capture(Number x){
               System.out.print("G");
          }
     }  

OUTPUT IS
AGAADGBDAF

why in this program wrapper Byte is widen to Number
because Wrapper type cant widen...
so why this program works fine???

[Markus Klein]

Widening of reference variable depends on inheritance(so, Integer cannot be widened to Long. But, Integer widened to Number)