软件工程面试题（二十一）

1、定义两个变量a和b，不使用第三个变量，使两个值交换

public class testMain {

    public void test(int a,int b){

     System.out.println("交换前a = "+a);

     System.out.println("交换前b = "+b);

    

     a=a+b;

     b=a-b;

     a=a-b;

    

       System.out.println("交换后a = " +a);

       System.out.print("交换后b = "+b);

    }

    public static void main(String args[]){    

     new testMain().test(10,13);

    }

}

2、题目：JS树形菜单

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>