package operator;
//不用第三个辅助变量，实现两个数的交换
public class Demo08 {public static void change(int a, int b){a = a+b;b = a-b;a = a-b;System.out.println(a);System.out.println(b);}public static void main(String[] args) {change(900,3000);}
}

后续可能会补充别的算法。