学步园

public class ChangeTwoNumber{
	public static void main(String[] args){
		changeTwoNumber(1,2);
	}
	
	/**
	 * 交换两个int数的值
	 */
	static void changeTwoNumber(int a, int b){
		System.out.println("what user input is: a = " + a + ", b = " + b);
		a = a ^ b;
		b = a ^ b;
		a = a ^ b;
		System.out.println("what the program output is: a = " + a + ", b = " + b);
	}
}

执行的结果：

what user input is : a = 1, b = 2

what the program output is: a = 2, b = 1