Wrappers

[James Tharakan]

class test{  
    	int i;
        public static void main (  String [] args )
	{
	      final test t= new test();
              final Integer I= new Integer(2000);  
              
              t.i++;  
              I++; 
        }
}

Both t and I are reference variables, holding the memory location of their respective objects.
Using final(for the test object) ,implies that the contents of the reference cannot be changed BUT the object state can be changed.
Isn't it the same for Integer reference. If not why??

[Wouter Oet]

Because the increment operation tries to unbox the Integer, increment it, create a new Integer with that value and assign it to I.

Edit: wrapper classes are immutable

[kshitij dogra]

What is actually happening is that the Integer i , is being unboxed and then incremented , and then again boxed back to the value.......

[James Tharakan]

got it..