题

package demo01;

public class demo001 {

public static void main(String[] args) {
// TODO Auto-generated method stub
int a = 1;
int b = 2;
int c;

// 进行数据交换
c = a;
a = b;
b = c;

System.out.println("交换后的 a:" + a + "，b:" + b);
}

}