/**
*
* @Title: test_exchange
* @Description: 该方法的主要作用:交换两个数
* @param 设定文件
* @return 返回类型:void
* @throws
*/
@Test
public void test_exchange(){
int num1 = 10;
int num2 = 20;
int exchange = 0;
System.out.println("原来的数:"+num1+" "+num2);
exchange = num1;
num1 = num2;
num2 = exchange;
System.out.println("交换之后的数:"+num1+" "+num2);
}