用List接口实现类（ArrayList和LinkedList）实现员工信息简单的增删改查。

柔光的暖阳◎ 2022-05-15 00:23 206阅读 0赞

**任务需求2：**

参考图中的模式，模拟员工管理系统，用List接口实现类（ArrayList和LinkedList）实现员工信息的增删改查。

**所需知识点：**  
1.List接口的实现类ArrayList；  
2.对集合信息的增删改查；  
3.增强for循环；  
**运行截图：**

![70][]

**代码如下：**

package cn.demo.main;
    
    import java.util.LinkedList;
    import java.util.Scanner;
    
    import cn.demo.person.Person;
    
    public class Main {
    
    	public static void main(String[] args) {
    
    		Demo();
    }
    
    	private static void Demo() {
    		Scanner scr = new Scanner(System.in);
    		LinkedList<Person> list = new LinkedList<>() ;
    		int newflag = 0 ; 
    		while(newflag==0){
    		MainShow();
    		int number = scr.nextInt() ; 
    		if(number==1){
    			Demo1(scr, list);
    		}else if(number==2){
    			Demo2(scr, list);
    		}else if(number==3){
    			Demo3(scr, list);
    		}else if(number==4){
    			Demo4(scr, list);
    		}else if(number==5){
    			Demo5(list);
    		}else{
    			System.out.println("退出！");
    			newflag = 1 ; 
    		}
    	}
    	}
    
    	private static void Demo5(LinkedList<Person> list) {
    		System.out.println("员工的全部信息如下：");
    		for (Person person : list) {
    			System.out.println("编号："+person.getId()+" , "+"姓名："+person.getName()+" , "+"工资："+person.getMoney());
    		}
    	}
    
    	private static void Demo4(Scanner scr, LinkedList<Person> list) {
    		System.out.println("请输入所要删除员工的编号：");
    		int numberid = scr.nextInt() ; 
    		int flag = 0 ; 
    		int index = 0 ; 
    		for (Person person : list) {
    			if(person.getId()==numberid){
    				list.remove(index);
    				System.out.println("删除完成！");
    				flag = 1 ;
    				break;
    			}
    			index++;
    		}
    		if(flag==0){
    			System.out.println("没找到此员工!");
    		}
    	}
    
    	private static void Demo3(Scanner scr, LinkedList<Person> list) {
    		System.out.println("输入需要修改工资的员工编号：");
    		int idMoney = scr.nextInt() ; 
    		int flag = 0 ; 
    		for (Person person : list) {
    			if(person.getId()==idMoney){
    				System.out.println("请输入修改的工资：");
    				double moneyNumber = scr.nextDouble() ; 
    				person.setMoney(moneyNumber);
    				System.out.println("修改完成！");
    				flag = 1 ; 
    				break ;
    			}
    		}
    		if(flag==0){
    			System.out.println("没有此员工！");
    		}
    	}
    
    	private static void Demo2(Scanner scr, LinkedList<Person> list) {
    		System.out.println("请输入所要查询员工的编号：");
    		int newid = scr.nextInt() ;
    		int flag = 0 ;
    		for (Person p : list) {
    			if(p.getId()==newid){
    				System.out.println("此员工信息如下：");
    				System.out.println("编号："+p.getId()+" , "+"姓名："+p.getName()+" , "+"工资："+p.getMoney());
    				flag = 1 ;
    				break;
    			}
    		}
    		if(flag==0){
    			System.out.println("没有找到此员工！");
    		}
    	}
    
    	private static void Demo1(Scanner scr, LinkedList<Person> list) {
    		System.out.println("请输入新增员工的编号：");
    		int newid = scr.nextInt() ;
    		System.out.println("请输入新增员工的姓名：");
    		String newname = scr.next() ; 
    		System.out.println("请输入新增员工的工资：");
    		double newmoney = scr.nextDouble() ; 
    		Person p = new Person(newid,newname,newmoney);
    		list.add(p);
    		System.out.println("添加成功！");
    	}
    
    	private static void MainShow() {
    		System.out.println("功能选择：");
    		System.out.println("1.添加员工");
    		System.out.println("2.查找员工");
    		System.out.println("3.修改员工工资");
    		System.out.println("4.删除员工");
    		System.out.println("5.输出员工的个人全部信息");
    		System.out.println("6.退出系统");
    		System.out.println("请输入您的选择：");
    	}
    
    }

[70]: /images/20220515/f9b51f0dcf5641198c0e7cbdcf0561d5.png