迷你图书器

package bms;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Scanner;//图书类public class Book {  Scanner input=new Scanner(System.in);  Book[] books=new Book[20];  String bookName;//图书名  boolean rentStatus;//是否借出  int count;//借出次数  String date;//借出时间    public void init(){books[0]=new Book();books[0].bookName="宫";books[0].rentStatus=false;books[0].count=0;books[0].date="";books[1]=new Book();books[1].bookName="海贼王";books[1].rentStatus=true;books[1].count=300;books[1].date="2017-03-22";books[2]=new Book();books[2].bookName="老人与海";books[2].rentStatus=true;books[2].count=80;books[2].date="2017-03-12";  }  //0.查看所有  public void selectAll(){  System.out.println("图书名"+"\t"+"是否借出"+"\t"+"借出次数"+"\t"+"借出时间");  for(int i=0;i<books.length;i++){if(books[i]!=null){  System.out.println(books[i].bookName+"\t"+         (books[i].rentStatus?"已借出":"未借出")+"\t"     +books[i].count+"\t"+books[i].date);}  }  }  //1.添加图书  public void Add(){ boolean isOK=false;//是否添加成功 for(int i=0;i<books.length;i++){ if(books[i]==null){ System.out.println("图书添加失败!"); }else{ books[i]=new Book(); System.out.print("请输入要添加的图书名:"); books[i].bookName=input.next(); books[i].rentStatus=false; books[i].count=0; books[i].date=""; System.out.println(books[i].bookName+"添加成功!"); isOK=true; break; } }  }  //2.查询某本图书  public void select(){  System.out.print("请输入要查看的图书名称:");  String lookBK=input.next();  int index=-1;//是否找到了  for(int i=0;i<books.length;i++){if(books[i]!=null){if(lookBK.equals(books[i].bookName)){index=i;break;}}  }  System.out.println("图书名:"+"\t"+"是否借出"+"\t"+"借出次数"+"\t"+"借出时间");  System.out.println(books[index].bookName+"\t"+        (books[index].rentStatus?"已借出":"未借出")+"\t"+  books[index].count+"\t"+books[index].date);  }  //3.删除图书  public void delete(){  boolean flage=false;//标识是否找到  System.out.print("请输入要删除的图书名:");  String dName=input.next();  for(int i=0;i<books.length;i++){if(books[i]!=null){//书名一样并且没有被借出if(dName.equals(books[i].bookName)&&(!books[i].rentStatus)){  int j=i;  while(books[j+1]!=null){//找到的后一项不为空  books[j].bookName=books[j+1].bookName;  books[j].count=books[j+1].count;  books[j].rentStatus=books[j+1].rentStatus;  books[j].date=books[j+1].date;  j++;  }  books[j]=null;//找到的当前项赋值为空  System.out.println(dName+"删除成功!");  flage=true;//找到了要删除的图书  break;  } }  }  if(!flage){  System.out.println("没有找到该图书，或图书已借出，借书失败!");  System.out.println("***************************");  }  }  //4.借出图书  public void Jie(){boolean flage=false;//是否找到System.out.print("请输入要借出图书的名称:");String jName=input.next();for(int i=0;i<books.length;i++){//遍历数组,查找要借的图书名  if(books[i]!=null){  if(jName.equals(books[i].bookName)&&(!books[i].rentStatus)){  books[i].rentStatus=true;//修改借书状态  books[i].count+=1;//借出后,次数加1  System.out.println("借书成功!");  flage=true;}    }}if(!flage){System.out.println("借书失败,图书不存在或已借出!");}  }  //5.归还图书  public void guiHuan(){System.out.print("请输入要归还的图书名称:");String ghName=input.next();int index=-1;//是否找到int i;for(i=0;i<books.length;i++){//遍历数组找到图书,修改图书借出状态if(ghName.equals(books[i].bookName)){index=i;break;}}books[i].rentStatus=false;SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");Date d1=new Date();//归还时间sdf.format(d1);//格式化当前时间String jTime=books[i].date;try {Date d2=sdf.parse(jTime);//从数组中取出借书时间sdf.format(d2);//格式化化借书时间long s=(d1.getTime()-d2.getTime())/(1000*60*60*24);System.out.println("总共借书"+s+"天!");int mony=0;//租金for(int j=0;j<s;j++){mony+=1;}System.out.println("借书总金额为:"+mony+"元");} catch (ParseException e) {System.out.println("你输入的时间格式不正确!");}  }}

package bms;import java.util.Scanner;public class Test {  public static void main(String[] args){  Scanner input=new Scanner(System.in);  Book bk=new Book();  bk.init();  String isGo;//是否继续  do{  System.out.println("欢迎使用迷你图书器");   System.out.println("------------------------------------");  System.out.println("               0.列表                                                 ");  System.out.println("               1.新增                                                 ");  System.out.println("               2.查看                                                 ");  System.out.println("               3.删除                                                 ");  System.out.println("               4.借出                                                 ");  System.out.println("               5.归还                                                 ");  System.out.println("------------------------------------");  System.out.print("请选择:");  int op=input.nextInt();  switch(op){  case 0:  bk.selectAll();//查看所有  break;  case 1:  bk.Add();//添加  break;  case 2:  bk.select();//查看  break;  case 3:  bk.delete();//删除  break;  case 4:  bk.Jie();  break;//借出  default:  bk.guiHuan();  break;//归还  }  System.out.print("是否继续?(y/n):");  isGo=input.next();  }while(isGo.equalsIgnoreCase("y"));{  System.out.println("感谢使用迷你图书器,再见!");  }  }}