Java 有一个员工类,一个项目组类,用ArrayList怎么弄,要求完成添加查询删除.控制台输出就行.

Employee employee1 = new

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Employee();

List employees = new ArrayList();

// add employee

employees.add(employee1);

// delete employee

employees.remove(employee1);

// search employee

for each ( emp : employee){

if (emp.name.equals("Ken")){

print("cool");

}

}

JAVA员工管理小程序

Employee类:

public class Employee {

private int id;

private String name;

private int age;

private String email;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

}

Manager类:

import java.util.ArrayList;

import java.util.List;

public class Manager {

public static ListEmployee employees = new ArrayListEmployee();

public static void addEmployee(Employee employee){

employees.add(employee);

}

public static void deleteEmployee(Employee employee){

employees.remove(employee);

}

public static void updateEmployee(Employee employee){

int len = employees.size();

for(int i=0;ilen;i++){

Employee e = employees.get(i);

if(e.getId() == employee.getId()){

deleteEmployee(e);

addEmployee(employee);

}

}

}

public static Employee selectEmployeeById(int id){

int len = employees.size();

if(len!=0){

Employee emp = new Employee();

for(int i=0;ilen;i++){

Employee e = employees.get(i);

if(e.getId() == id){

emp = e;

}

}

return emp;

}else{

return null;

}

}

public static Employee selectEmployeeByName(String name){

int len = employees.size();

if(len!=0){

Employee emp = new Employee();

for(int i=0;ilen;i++){

Employee e = employees.get(i);

if(e.getName().equals(name)){

emp = e;

}

}

return emp;

}else{

return null;

}

}

public static void printEmployees(){

int len = employees.size();

if(len != 0){

for(int i=0;ilen;i++){

System.out.println(employees.get(i).getId()+":\t"+

employees.get(i).getName()+"\t"+

employees.get(i).getAge()+"\t"+

employees.get(i).getEmail());

}

}else{

System.out.println("无员工");

}

}

}

测试EmpManaTest类：

public class EmpManaTest {

public static void main(String[] args) {

Employee e = new Employee();

e.setId(1);

e.setName("zz");

e.setAge(20);

e.setEmail("zz@163.com");

Manager.addEmployee(e);

Employee e2 = new Employee();

e2.setId(2);

e2.setName("scof");

e2.setAge(18);

e2.setEmail("scofield@mail.com");

Manager.addEmployee(e2);

System.out.println("添加员工后：");

Manager.printEmployees();

System.out.println("----------------------------------------------");

Employee emp = new Employee();

emp.setId(1);

emp.setName("virus");

emp.setAge(30);

emp.setEmail("virus@163.com");

Manager.updateEmployee(emp);

System.out.println("修改员工后：");

Manager.printEmployees();

System.out.println("----------------------------------------------");

System.out.println("查询员工ByID：");

Employee empSelectId = Manager.selectEmployeeById(1);

System.out.println(empSelectId.getName());

System.out.println("----------------------------------------------");

System.out.println("查询员工ByName：");

Employee empSelectName = Manager.selectEmployeeByName("virus");

System.out.println(empSelectName.getEmail());

System.out.println("----------------------------------------------");

System.out.println("删除一个员工后：");

Manager.deleteEmployee(emp);

Manager.printEmployees();

}

}

这个是不是你想要的...........

利用java代码,编写JDBC连接数据库新增员工信息的步骤. 员工信息表:t_emp(id int？

第一步：新建数据库

连接的是本地localhost，新建一个新的数据库名是jdbctest

然后建表t_emp

不会的话可通过执行下方的sql语句建表

CREATE TABLE `t_emp` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`name` varchar(255) DEFAULT NULL,

`salary` double DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

第二步：新建java项目

新建完以后添加mysql驱动的jar包，jar包自己下载

在项目上右键鼠标属性，然后

添加jar包，我这里已经加载过了

第三步：编写代码

package com.gf;

import java.sql.DriverManager;

import java.sql.SQLException;

import com.mysql.jdbc.Connection;

import com.mysql.jdbc.Statement;

public class Test {

public static void main(String[] args) throws Exception {

int flag=0;

//1.加载驱动

Class.forName("com.mysql.jdbc.Driver");

//2.获取连接

Connection conn=(Connection) DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/jdbctest?user=rootpassword=123456useUnicode=truecharacterEncoding=UTF-8");

//3.创建statement

Statement sm=(Statement) conn.createStatement();

//4.执行sql语句

flag=sm.executeUpdate("insert into t_emp(name,salary) values('菲菲',34.9)");

if(flag!=0) {

System.out.println("员工信息增加成功");

}else {

System.out.println("添加失败");

}

}

}

注意点：

---------------------------------------------------------------------------------

DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/jdbctest?user=rootpassword=123456useUnicode=truecharacterEncoding=UTF-8");

这里需要修改自己本机的连接信息，不然会出现连接失败

最后的执行结果

java eclipse3.2

从无到有这么编写比较好。我老师给了我一堆东西。叫我往里面添加。我现在都弄不明白里面哪里有错。eclipse太高级了太难学了。

求一段简单的JAVA代码 要求员工工资管理系统的一个增删改查代码，谢谢了

对数据库进行增删改查？

以下是 sql server 2013+java.实现的是对MSC对象的增删改查.

需要下载连接驱动程序：com.microsoft.sqlserver.jdbc.SQLServerDriver

网上搜一下就行

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

class MSC

{

public String MscID;

public String MscName;

public String MscCompany;

public float MscLongitude;

public float MscLatitude;

public float MscAltitude;

public MSC(String MscID, String MscName, String MscCompany,

float MscLongitude, float MscLatitude,float MscAltitude){

this.MscID = MscID;

this.MscName = MscName;

this.MscCompany = MscCompany;

this.MscLongitude =MscLongitude;

this.MscLatitude = MscLatitude;

this.MscAltitude = MscAltitude;

}

}

public class sqlserverjdbc {

public Connection getConnection(){

String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; //加载JDBC驱动

String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=gsm"; //连接服务器和数据库sample

String userName = "sa"; //默认用户名

String userPwd = "123"; //密码

Connection dbConn = null;

try {

Class.forName(driverName);

dbConn =DriverManager.getConnection(dbURL, userName, userPwd);

} catch (Exception e) {

e.printStackTrace();

}

return dbConn;

}

public void printUserInfo(){

Connection con = getConnection();

Statement sta = null;

ResultSet rs = null;

System.out.println("打印表格MSC信息");

try {

sta = con.createStatement();

rs = sta.executeQuery("select * from MSC信息");

System.out.println("MscID\tMscName\tMscCompany\tMscLongitude\tMscLatitude\tMscAltitude");

while(rs.next()){

System.out.println(rs.getString("MscID")+"\t"+

rs.getString("MscName")+"\t"+

rs.getString("MscCompany")+"\t"+

rs.getFloat("MscLongitude")+"\t"+

rs.getFloat("MscLatitude")+"\t"+

rs.getFloat("MscAltitude"));

}

con.close();

sta.close();

rs.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("打印完成\n");

}

public void delete(String MscID){

Connection con = getConnection();

String sql = "delete from MSC信息 where MscID = " + MscID;

PreparedStatement pst;

System.out.println("删除表格MSC信息中 ID = "+MscID+"的记录");

try {

pst = con.prepareStatement(sql);

pst.execute();

pst.close();

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("记录删除失败！！！");

}

System.out.println("记录删除成功！！！\n");

}

public void insert(MSC msc){

Connection con = getConnection();

String sql = "insert into MSC信息 values(?,?,?,?,?,?)";

PreparedStatement pst;

System.out.println("插入一条记录");

try {

pst = con.prepareStatement(sql);

pst.setString(1, msc.MscID);

pst.setString(2, msc.MscName);

pst.setString(3, msc.MscCompany);

pst.setFloat(4, msc.MscLongitude);

pst.setFloat(5, msc.MscLatitude);

pst.setFloat(6, msc.MscAltitude);

pst.execute();

pst.close();

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("插入失败！！！");

}

System.out.println("插入成功！！！\n");

}

//更新MscID的MscName

public void updateMscName(String MscID, String MscName){

Connection con = getConnection();

String sql = "update MSC信息 set MscName = ? where MscID = ?";

PreparedStatement pst;

System.out.println("修改一条记录");

try {

pst = con.prepareStatement(sql);

pst.setString(1, MscName);

pst.setString(2, MscID);

pst.execute();

pst.close();

con.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println("修改失败！！！");

}

System.out.println("修改成功！！！\n");

}

public static void main(String args[]){

sqlserverjdbc sql = new sqlserverjdbc();

sql.printUserInfo();

sql.delete("1111");

sql.printUserInfo();

sql.updateMscName("5215", "联想");

sql.printUserInfo();

sql.insert(new MSC("1111", "中兴" ," 中兴", (float)12.2, (float)3.4,(float)45.5));

sql.printUserInfo();

}

}

使用Java的框架类实现员工信息的增删改！

传不上去。文字太多。

我把代码写到博客上了，你到博客看吧。

jsp+servlet

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