学步园

public class swap {
	public static void main(String[] args) {
		int a = 4, b = 10;
		System.out.println("a="+a+"  b="+b);
		//swap
		a=a^b;
		b=a^b;
		a=a^b;
		System.out.println("a="+a+" b="+b);
	}

}