Swap two character without using any variable

 Swap  two character with out using any variable:

public class SwapTwoCharacterWithoutUsingVaraible {
public static void main(String[] args) {
    char ch1='A';
    char  ch2='d';
    System.out.println("ch1="+ch1+"  ch2="+ch2);
    ch1=(char) ((ch1-'a')+(ch2-'a'));
    ch2= (char) (('a')+ch1-(ch2-'a'));
    ch1= (char) ('a'+ch1-(ch2-'a'));
    System.out.println("after swap");
    System.out.println("ch1="+ch1+"   ch2="+ch2);
 }       
}