03_模拟DVD

package com.entity;

import java.text.SimpleDateFormat;
import java.util.Date;

public class DVD {
    private String name;
    private boolean borrowed;
    private Date borrowedTime;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Date getBorrowedTime() {
        return borrowedTime;
    }
    public void setBorrowedTime(Date borrowedTime) {
        this.borrowedTime = borrowedTime;
    }
    public DVD(String name, boolean borrowed, Date borrowedTime) {
        super();
        this.name = name;
        this.setBorrowed(borrowed);
        this.borrowedTime = borrowedTime;
    }
    public DVD() {
        super();
    }
    public String toString(){
        String status= isBorrowed()?"已借出":"可借";
        String date;
        if(getBorrowedTime()==null){
            date="";
        }else{
            date=new SimpleDateFormat("yyyy-MM-dd").format(getBorrowedTime());
        }
        return "《"+getName()+"》\t"+status+"\t"+date;
    }
    public void setBorrowed(boolean borrowed) {
        this.borrowed = borrowed;
    }
    public boolean isBorrowed() {
        return borrowed;
    }

}
package com.entity;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;

public class DVDManager {
    private ArrayList<DVD> dvdList;
    private final int price=2;//一张DVD2块钱1天
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
    Scanner input=new Scanner(System.in);

    public void setDvdList(ArrayList<DVD> dvdList) {
        this.dvdList = dvdList;
    }

    public ArrayList<DVD> getDvdList() {
        return dvdList;
    }
    public DVDManager(){

    }
    public DVDManager(ArrayList<DVD> dvdList){
        this.dvdList=dvdList;
    }
    public void initial(){
        dvdList=new ArrayList<DVD>();
        try {
            DVD d=new DVD("罗马假日",true,sdf.parse("2013-07-01"));
            DVD d2=new DVD("风声鹤唳",false,null);
            DVD d3=new DVD("浪漫满屋",false,null);
            dvdList.add(d);
            dvdList.add(d2);
            dvdList.add(d3);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }

    public void mainMenu(){
        System.out.println("欢迎使用迷你DVD管理器");
        System.out.println("-------------------------------------------------------");
        System.out.println("" +
                "1. 新增DVD\n" +
                "2. 查看DVD\n" +
                "3. 删除DVD\n" +
                "4. 借出DVD\n" +
                "5. 归还DVD\n" +
                "6. 退出DVD");
        System.out.println("-------------------------------------------------------");
        System.out.print("请选择：");
        input=new Scanner(System.in);
        String regex="^[1-6]{1}$";
        while(!input.hasNext(regex)){
            input=new Scanner(System.in);
            System.out.print("输入有误，请重新选择：");
        }
        int check_1=input.nextInt();
        switch(check_1){
            case 1:
                addDVD();
                break;
            case 2:
                queryAll();
                break;
            case 3:
                deleteDVD();
                break;
            case 4:
                borrowDVD();
                break;
            case 5:
                lend();
                break;
            case 6:
                System.out.println();
                System.out.println("谢谢使用！");
                System.exit(0);
                break;
            }
            System.out.println("********************************");
            back();
    }

    public void back(){
        System.out.print("输入0返回：");
        input=new Scanner(System.in);
        String regex="^0$";
        while(!input.hasNext(regex)){
            input=new Scanner(System.in);
            System.out.print("输入有误，输入0返回：");
        }
        mainMenu();
    }
    public void queryAll(){
        System.out.println("---->  查看DVD\n");
        System.out.println("序号\t         名称 \t\t状态\t    借出日期");
        for(int i=0;i<dvdList.size();i++){
            System.out.println((i+1)+"\t"+dvdList.get(i));
        }
    }
    public DVD findDVDByName(String name){
        //DVD dvd=null; 与DVD dvd=new DVD()；是有不同的
        DVD dvd=null;
        for(int i=0;i<dvdList.size();i++){
            if(dvdList.get(i).getName().equals(name)){
                dvd=dvdList.get(i);
                break;
            }
        }
        return dvd;
    }

    public void addDVD(){//新增DVD
        System.out.println("----> 新增DVD\n");
        System.out.print("请输入DVD名称：");
        String name=input.next();
        DVD d=findDVDByName(name);
        if(d!=null){
            System.out.println("该DVD已经存在，不能再次添加！");
            return;
        }
        d=new DVD(name,false,null);
        dvdList.add(d);
        System.out.println("新增《"+d.getName()+"》成功！");
    }

    public void borrowDVD(){
        System.out.println("----> 借出DVD\n");
        System.out.print("请输入DVD名称：");
        String name=input.next();
        DVD d=findDVDByName(name);
        if(d==null){
            System.out.println("该DVD不存在，无法借出！");
            return;
        }else if(d.isBorrowed()){
            System.out.println("不好意思，该DVD已被借出！");
        }
        System.out.print("请输入借书日期(年-月-日)：");
        String regex="\\d{4}-(([1][012])|([0][0-9]))-(([012][0-9])|([3][0]))";
        while(!input.hasNext(regex)){
            input=new Scanner(System.in);
            System.out.print("借书日期格式有误请重新输入：");
        }
        Date date = null;
        try {
            date=sdf.parse(input.next());
        } catch (ParseException e) {
            e.printStackTrace();
        }
        int index=dvdList.indexOf(d);
        d.setBorrowed(true);
        d.setBorrowedTime(date);
        dvdList.set(index, d);
        System.out.println("借出《"+name+"》成功！");
    }

    public void deleteDVD(){
        System.out.println("----> 删除DVD\n");
        System.out.print("请输入DVD名称：");
        String name=input.next();
        DVD d=findDVDByName(name);
        if(d==null){
            System.out.println("该DVD不存在，无法删除！");
            return;
        }else if(d.isBorrowed()){
            System.out.println("该DVD已被借出,无法删除");
            return;
        }
        dvdList.remove(d);//移除第一个，后面自动左移
        System.out.println("删除《"+name+"》成功！");
    }

    public void lend(){
        System.out.println("----> 归还DVD\n");
        System.out.print("请输入DVD名称：");
        String name=input.next();
        DVD d=findDVDByName(name);
        if(d==null){
            System.out.println("归还失败，该DVD不是我们店里的！");
            return;
        }else if(!d.isBorrowed()){
            System.out.println("归还失败，该DVD已经归还，您的DVD不是我们店里的！");
            return;
        }
        Date borrowDate = d.getBorrowedTime();
        Date lendDate = null;
        long spend;
        System.out.print("请输入还书日期(年-月-日)：");
        String regex="\\d{4}-(([1][012])|([0][0-9]))-(([012][0-9])|([3][0]))";
        while(true){//感觉还是玩死循环跳出爽
            while(!input.hasNext(regex)){
                input=new Scanner(System.in);
                System.out.print("还书日期格式有误请重新输入：");
            }
            try {
                lendDate=sdf.parse(input.next());
            } catch (ParseException e) {
                e.printStackTrace();
            }

            if(lendDate.before(borrowDate)){//Date的比较前者是否在后者之前的方法
                System.out.println("还书日期不可能比借出日期还早，请重新输入");
            }else{
                break;
            }
        }
        spend=lendDate.getTime()-borrowDate.getTime();
        int money=(int) Math.ceil(spend/(24*60*60*1000))*price;
        int index=dvdList.indexOf(d);
        d.setBorrowed(false);
        d.setBorrowedTime(null);
        dvdList.set(index, d);
        System.out.println("归还成功！");
        System.out.println("应付租金（元）："+money);
    }

}
package com.test;

import com.entity.DVDManager;

public class Test {
    public static void main(String[] args) {
        DVDManager dm=new DVDManager();
        dm.initial();
        dm.mainMenu();
    }
}