TWS笔试题---回家想了想答案，但愿对jobseeker有帮助

1，jsp的9大内置对象

request,response,session,application,page,pageContext,out,config,exception

查过资料了，如今补充一下；

JSP中九大内置对象为： 
request            请求对象                 类型 javax.servlet.ServletRequest        做用域 Request 
response          响应对象                   类型 javax.servlet.SrvletResponse       做用域  Page 
pageContext    页面上下文对象       类型 javax.servlet.jsp.PageContext      做用域    Page 
session            会话对象                   类型 javax.servlet.http.HttpSession       做用域    Session 
application       应用程序对象          类型 javax.servlet.ServletContext          做用域    Application 
out                   输出对象                   类型 javax.servlet.jsp.JspWriter             做用域    Page 
config              配置对象                  类型 javax.servlet.ServletConfig            做用域    Page 
page               页面对象                  类型 javax.lang.Object                            做用域    Page 
exception        例外对象                 类型 javax.lang.Throwable                     做用域    page

2，哪一个标签点击文字会聚焦到text文本输入框，答案是<input type="text" id="text1"><label for="text1">text1</label>

3，输出乘法口诀

public static void pringChengfakoujue() 
   {

       System.out.println("乘法口诀表");

       for(int outNum=1;outNum<=9;outNum++) 
       { 
           for(int innerNum=1;innerNum<=9;innerNum++) 
           {

               if(outNum>=innerNum) 
               { 
                   System.out.print("[" + innerNum + "*" + outNum + "=" + (outNum * innerNum) + "]"); 
               }

           } 
           System.out.println(); 
       }

   }

4，用数组实现一个栈，接口以下：

public interface IStatck {

    Object pop();

    int size();

    void push(Object obj);

}

 

实现代码：

package org.tws;

/** 
* Created with IntelliJ IDEA. 
* User: cutter.li 
* Date: 14-3-4 
* Time: 下午4:25 
* To change this template use File | Settings | File Templates. 
*/ 
public class ArrayStack implements IStatck {

    private Object[] objArray;

    public ArrayStack(Object[] objArray) 
    { 
        this.objArray=objArray; 
    }

    @Override 
    public Object pop() { 
        if(null==objArray){ 
            return null; 
        } 
        return  objArray[objArray.length-1]; 
    }

    @Override 
    public int size() {

        if(null==objArray) { 
            return 0; 
        } 
        return objArray.length;

    }

    @Override 
    public void push(Object obj) {

        int length=size();

        if(length==0) 
        { 
            objArray=new Object[]{obj}; 
        } else 
        { 
            Object[] objArray2=new Object[length+1]; 
            System.arraycopy(objArray,0,objArray2,0,length-1); 
            objArray2[length]=obj; 
            objArray=objArray2; 
        }

    } 
}

5，sql的行列转换

select departmentname as  '部门' 
, sum(if(monthName=1,icome,0)) as '一月份' 
, sum(if(monthName=2,icome,0)) as '二月份' 
, sum(if(monthName=3,icome,0)) as '三月份'  
, sum(icome) as '总收入' 
from t_icome group by departmentName ;

 

数据准备：

CREATE TABLE `t_icome` ( 
  `id` int(11) NOT NULL AUTO_INCREMENT, 
  `departmentName` varchar(3) NOT NULL, 
  `monthName` int(11) NOT NULL, 
  `icome` float NOT NULL, 
  PRIMARY KEY (`id`) 
) ENGINE=InnoDB;

INSERT INTO `t_icome` VALUES ('1', 'a', '1', '2000'); 
INSERT INTO `t_icome` VALUES ('2', 'a', '2', '2500'); 
INSERT INTO `t_icome` VALUES ('3', 'b', '1', '2500'); 
INSERT INTO `t_icome` VALUES ('4', 'b', '2', '2600'); 
INSERT INTO `t_icome` VALUES ('5', 'a', '3', '2600'); 
INSERT INTO `t_icome` VALUES ('6', 'b', '3', '2900'); 
INSERT INTO `t_icome` VALUES ('7', 'c', '1', '2900'); 
INSERT INTO `t_icome` VALUES ('8', 'c', '2', '2900');

 

6，数据去重

两张结构相同的表，查找在表a中不在表b的数据；

数据和表：

DROP TABLE IF EXISTS `t_a`; 
CREATE TABLE `t_a` ( 
  `id` int(11) NOT NULL AUTO_INCREMENT, 
  `no` varchar(20) DEFAULT NULL, 
  `product` varchar(20) DEFAULT NULL, 
  PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;

INSERT INTO `t_a` VALUES ('1', 'aaa', 'xxx'); 
INSERT INTO `t_a` VALUES ('2', 'bbb', 'xyz'); 
INSERT INTO `t_a` VALUES ('3', 'aaa', 'aaa'); 
INSERT INTO `t_a` VALUES ('4', 'aaa', 'ddd');

DROP TABLE IF EXISTS `t_b`; 
CREATE TABLE `t_b` ( 
  `id` int(11) NOT NULL DEFAULT '0', 
  `no` varchar(20) DEFAULT NULL, 
  `product` varchar(20) DEFAULT NULL, 
  PRIMARY KEY (`id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `t_b` VALUES ('1', 'aaa', 'xyz'); 
INSERT INTO `t_b` VALUES ('2', 'aaa', 'aaa'); 
INSERT INTO `t_b` VALUES ('3', 'aaa', 'fuck'); 
INSERT INTO `t_b` VALUES ('4', 'bbb', 'ccc'); 
INSERT INTO `t_b` VALUES ('5', 'bbb', 'nimei');

 

sql写法：

SELECT a.* FROM 
t_a a 
LEFT JOIN 
t_b b ON a.no = b.no  and a.product=b.product 
WHERE b.no IS NULL and b.product is null;