實現兩個整數變量的互換

 

1.須要添加第三方變量(開發中經常使用):

class Hello2 {
    public static void main(String[] args) {
             int x = 10;
             int y = 5;
             int temp;
             temp = x ;
             x = y;
             y = temp;
             System.out.println("x = " + x + ",y = " + y); 
    }

}

 

結果:

2.不須要第三方變量(1)(有弊端,有可能超過int的取值範圍):

class Hello2 {
    public static void main(String[] args) {
             int x = 10;
             int y = 5;
             x = x + y;
             y = x - y;
             x = x - y;
             System.out.println("x = " + x + ",y = " + y); 
    }

}

結果:

  不須要第三方變量(2)(用^來作):

class Hello2 {
    public static void main(String[] args) {
             int x = 10;
             int y = 5;
             x = x ^ y;
             y = x ^ y;
             x = x ^ y;
             System.out.println("x = " + x + ",y = " + y); 
    }

}

結果: