Object Oriented Programming Through Java by Pearson

5.12 Class Objects and Methods

13. int x=10;int y=100;

14. CallByVal val = new CallByVal();

15. val.SwapData(x,y);

16. System.out.println(“Inside main :return from SwapData, “);

17. System.out.println(“x:” + x + “y:”+y);}

18. }

Output: Inside SwapDataBefore Swap……… x:10y:100

Inside SwapData, After Swap ………. x:100y:10

Inside main on return from SwapData, x:10y:100

Line No. 15:   we have passed data by call by value. Line Nos. 8 and 9 show that

values inside Swapdata have indeed been swapped. These are local

changes.

Line Nos. 16 and 17:    show that values of x and y remain unchanged after return from

SwapData. This is characteristic of Call by ...