1.不使用额外变量而变换两个变量值

public static void main(String[] args) {        int a = 3;        int b = 4;        a = b +(b = a)*0;        System.out.println("a = "+a);        System.out.println("b = "+b);    }

2.斐波那契数列

public static void main(String[] args) {        int a  =1;        int b = 1;        while(b > 0){ //b溢出时终止            System.out.println(a);            b = a+(a = b);        }    }