不借助第三个变量来交换两个变量的值

不借助第三个变量来交换两个变量的值

public class ChangeTest {

public void changeMethodA(int a, int b){
System.out.println("changeMethodA交换之前\ta:"+a+"\tb:"+b);
a = a + b - (b = a);
System.out.println("changeMethodA交换之后\ta:"+a+"\tb:"+b);
}

public void changeMethodB(int a, int b){
System.out.println("changeMethodB交换之前\ta:"+a+"\tb:"+b);
b = a + (a = b)*0;
System.out.println("changeMethodB交换之后\ta:"+a+"\tb:"+b);
}

public void changeMethodC(int a, int b){
System.out.println("changeMethodC交换之前\ta:"+a+"\tb:"+b);
a = a + b;
b = a - b;
a = a - b;
System.out.println("changeMethodC交换之后\ta:"+a+"\tb:"+b);
}

public void changeMethodD(int a, int b){
System.out.println("changeMethodD交换之前\ta:"+a+"\tb:"+b);
a = a * b;
b = a / b;
a = a / b;
System.out.println("changeMethodD交换之后\ta:"+a+"\tb:"+b);
}

public void changeMethodE(int a, int b){
System.out.println("changeMethodE交换之前\ta:"+a+"\tb:"+b);
a = a^b;
b = a^b;
a = a^b;
System.out.println("changeMethodE交换之后\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);
}
}

运行结果：
changeMethodA交换之前 a:1 b:10
changeMethodA交换之后 a:10 b:1
-----------------------------------
changeMethodB交换之前 a:2 b:9
changeMethodB交换之后 a:9 b:2
-----------------------------------
changeMethodC交换之前 a:3 b:8
changeMethodC交换之后 a:8 b:3
-----------------------------------
changeMethodD交换之前 a:4 b:7
changeMethodD交换之后 a:7 b:4
-----------------------------------
changeMethodE交换之前 a:5 b:6
changeMethodE交换之后 a:6 b:5