不借助第三個變量實作兩個變量之間的值傳遞和交換

public class ChangeTest {   
       
    public void changeMethodA(int a, int b){   
        System.out.println("changeMethodA交換之前\ta:"+a+"\tb:"+b);   
        a = a + b - (b = a);   
       System.out.println("changeMethodA交換之後\ta:"+a+"\tb:"+b);   
    }   
       
    public void changeMethodB(int a, int b){   
        System.out.println("changeMethodB交換之前\ta:"+a+"\tb:"+b);   
        b = a + (a = b)*0;   
        System.out.println("changeMethodB交換之後\ta:"+a+"\tb:"+b);   
    }   
       
    public void changeMethodC(int a, int b){   
        System.out.println("changeMethodC交換之前\ta:"+a+"\tb:"+b);   
        a = a + b;   
        b = a - b;   
        a = a - b;   
        System.out.println("changeMethodC交換之後\ta:"+a+"\tb:"+b);   
    }   
       
    public void changeMethodD(int a, int b){   
        System.out.println("changeMethodD交換之前\ta:"+a+"\tb:"+b);   
        a = a * b;   
        b = a / b;   
        a = a / b;   
        System.out.println("changeMethodD交換之後\ta:"+a+"\tb:"+b);   
    }   
       
    public void changeMethodE(int a, int b){   
        System.out.println("changeMethodE交換之前\ta:"+a+"\tb:"+b);   
        a = a^b;   
        b = a^b;   
        a = a^b;   
        System.out.println("changeMethodE交換之後\ta:"+a+"\tb:"+b);   
    }   
       
    public static void main(String[] args) {   
        ChangeTest changeTest = new ChangeTest();   
        changeTest.changeMethodA(1, 10);   
        System.out.println("-----------------------------------");   
        changeTest.changeMethodB(2, 9);   
        System.out.println("-----------------------------------");   
        changeTest.changeMethodC(3, 8);   
        System.out.println("-----------------------------------");   
        changeTest.changeMethodD(4, 7);   
        System.out.println("-----------------------------------");   
        changeTest.changeMethodE(5, 6);   
    }   
  }  





運作結果：
changeMethodA交換之前 a:1 b:10 
changeMethodA交換之後 a:10 b:1 
----------------------------------- 
changeMethodB交換之前 a:2 b:9 
changeMethodB交換之後 a:9 b:2 
----------------------------------- 
changeMethodC交換之前 a:3 b:8 
changeMethodC交換之後 a:8 b:3 
----------------------------------- 
changeMethodD交換之前 a:4 b:7 
changeMethodD交換之後 a:7 b:4 
----------------------------------- 
changeMethodE交換之前 a:5 b:6 
changeMethodE交換之後 a:6 b:5