Widening and Autooboxing

[Robert Darling]

Hi,

I read a statement once that you box and widen, but not widen and then box. Could you please give me an example of these 2 statements.

Kind Regards,
Muhammad Mateen

[Ravinderjit Singh]

Have a look on this Link for widening and boxing

[Frits Walraven]

Hi Muhammad,

Boxing and Widening is allowed

   
static void go (Object o) {
   Byte b2 = (Byte) o;
   System.out.println(b2);
}
public static void main (String args[]){
   byte b= 5;
   go(b);  // boxing to Byte ( Byte is-a Number is-a Object ) 
}
 

Widening an Boxing is not allowed

 
public void increase (Long i){}

public static void main (String args[]){
   int b= 5;
   increase(b); // IS NOT LEGAL
}

Regards,
Frits