Java基础练习之用数组写一个员工管理系统

package homework1;

//员工类

public class Employee {
public static Employee[] employees = new Employee[10000];
protected Integer id;
private String name;
private  String address;
private String sex;

public Employee(){

}

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

public void show() {
System.out.println(id+"\t"+name+"\t"+sex+"\t"+address);
}

}

package homework1;

//方法类

import java.util.Scanner;

public class Method {
Scanner input = new Scanner(System.in);
public void main(){
System.out.println("请输入     1增加员工     2删除员工     3修改员工     4查询员工     5显示全部员工     6退出程序");
System.out.println("请选择：");
choice();
}
//增加员工
public void addEmployee(){

Employee e = new Employee();
System.out.println("添加员工：");
System.out.println("输入id,该Id值应为0~9999之间:");
int idnumber = input.nextInt();
e.setId(idnumber);
if(0<idnumber&&idnumber>9999){
System.out.println("请输入0~9999之间的数，请重新输入");
}else{

//判断输入的id是否已经存在
if(Employee.employees[e.getId()]!=null){
System.out.println("已有id,请重新输入!若要修改该id的员工信息，请输入3进入修改。");
}else{
System.out.println("输入姓名:");
e.setName(input.next());
System.out.println("输入性别:");
e.setSex(input.next());
System.out.println("输入地址:");
e.setAddress(input.next());
Employee.employees[e.getId()] = e;
System.out.println("添加成功");

}
}

}
//删除员工的方法
public void deleteEmployee(){
System.out.println("请输入要删除员工的id：");
int id = input.nextInt();
//判断输入id是否存在
seachID(id);
if(Employee.employees[id]!=null){
Employee.employees[id]=null;
System.out.println("删除成功！");
}
}
//修改
public void changeEmployee(){
//显示全部

// showEmployee();
System.out.println("输入需要修改的员工的id：");
int id = input.nextInt();
//判断输入id是否存在
seachID(id);
//如果存在就继续
if(Employee.employees[id]!=null){
System.out.println("请输入你要修改的选项1)id 2)姓名 3)性别 4)地址");
int change = input.nextInt();

switch(change){
case 1:
System.out.println("修改为id：");
int in = input.nextInt();
for(int i=0;i < Employee.employees.length; i++){
if(Employee.employees[in]!=null){
System.out.println("该id已存在，请重新赋值！");
System.out.println("修改失败！");
break;
}else{
Employee.employees[id].setId(in);
System.out.println("修改成功");
break;
}
}

break;
case 2:
System.out.println("修改为姓名：");
String j = input.next();
Employee.employees[id].setName(j);
System.out.println("修改成功");

break;
case 3:
System.out.println("修改为性别：");
String k = input.next();
Employee.employees[id].setSex(k);
System.out.println("修改成功");

break;
case 4:
System.out.println("修改为地址：");
String l = input.next();
Employee.employees[id].setAddress(l);
System.out.println("修改成功");

break;
default:
System.out.println("请输入1-4的数！！！");
}

}

}
//查询
public void seachEmployee(){
System.out.println("输入需要查询的员工的id：");
int id = input.nextInt();
seachID(id);

}

//显示全部
public void showEmployee(){
System.out.println("id\t姓名\t性别\t地址");
for(int i=0;i < Employee.employees.length; i++){
if(Employee.employees[i]!=null){
Employee.employees[i].show();
}
}
}

//判断id是否存在的方法
public void seachID(int b){
for(int i=0;i < Employee.employees.length; i++){
if(Employee.employees[b]!=null){
System.out.println("id\t姓名\t性别\t地址");
Employee.employees[b].show();
break;
}else{
System.out.println("未找到id为"+b+"的员工信息！");
System.out.println("操作失败！");
break;
}
}
}

public void choice(){
int i = input.nextInt();
switch(i){
case 1:
//增加员工
addEmployee();
main();
break;
case 2:
//删除员工
deleteEmployee();
main();
break;
case 3:
//修改员工
changeEmployee();
main();
break;

case 4:
//查询员工
seachEmployee();
main();
break;

case 5:
//显示全部
showEmployee();
main();
break;
case 6:
//退出程序
System.out.println("************************退出成功************************");
break;
default:
System.out.println("输入有误，请重新输入！");
main();

}
}

}

package homework1;

//测试类

public class Test {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("***********************************欢迎使用员工管理系统***********************************");
Method method = new Method();
method.main();

}

}