这个程序运行报错是哪里出问题了？？？

Question

import java.util.Arrays;import java.util.Date;import java.util.Scanner;import java.lang.reflect.Array;import java.text.ParseException;import java.text.SimpleDateFormat;public class bookSet{public static void main(String[] args){ String[] name=new String[5]; String[] state=new String[5]; String[] date=new String[5]; //int[] count=new int[9]; Scanner input=new Scanner(System.in); SimpleDateFormat sdf=new SimpleDateFormat("yyyy-mm-dd"); public void startMenu(){ System.out.println("@@@@@@@@@@@@"); System.out.println("welcom to booksystem!"); System.out.println("1,add book"); System.out.println("2,look book"); System.out.println("3,delete book"); System.out.println("4,lend book"); System.out.println("5,return book"); System.out.println("6,exit system"); System.out.println("@@@@@@@@@@@@"); System.out.println("please to select"); int select=input.nextInt(); switch(select){ case 1: System.out.println("add new book"); System.out.println("@@@@@@@@@@@@"); Add(); startMenu(); break; case 2: System.out .println("look the book"); System.out.println("@@@@@@@@@@@@"); Look(); startMenu(); break; case 3: System.out.println("delet the book"); System.out.println("@@@@@@@@@@@@"); Delet(); startMenu(); break; case 4: System.out.println("lend the book"); System.out.println("@@@@@@@@@@@@"); Lend(); startMenu(); break; case 5: System.out.println("return the book"); System.out.println("@@@@@@@@@@@@"); Return(); startMenu(); break; case 6: System.out.println("exit the system"); break; } }} public void Look(){ System.out.println("num"+"\tstate"+"\tname"+"\tlenddate"); for(int i=0;i<name.length;i++){ if(this.name[i]==null){ break; } System.out.println((i+1)+"\t"+this.state[i]+"\t"+this.name[i]+"\t"+this.date[i]); } } /*public void Add(){ for(int i=0;i<name.length;i++){ if(name[i]==null){ System.out.println("please to input information"); name[i]=in.next(); state[i]="1"; System.out.println("yes or no"); String a=in.next(); if(a.equals("n")){ System.out.println("go back no add"); break; } } } }*/ public void Delet(){ System.out.println("input delet bookname"); String bookname=input.next(); for(int i=0;i<name.length;i++){ if(name[i]!=null&&name[i].equals(bookname)&&state[i].equals("1")){ int j=i; while(name[j=+1]!=null){ name[j]=name[j+1]; state[j]=state[j+1]; date[j]=date[j+1]; j++; } name[j]=null; state[j]=null; date[j]=null; System.out.println("delet ok"); break; }else if(name[i].equals(bookname)&&state[i].equals("0")){ System.out.println("lend out can't delet"); break; } } } public void Add(){ System.out.println("input new bookname"); String bookname=input.next(); for(int i=0;i<name.length;i++){ if(name[i]==null){ System.out.println("please to input newbook"); name[i]=input.next(); state[i]="1"; System.out.println("to go on 'y' or 'n'"); String y=input.next(); if(y.equals("n")){ System.out.println("break to add"); break; } } } } public void Lend(){ System.out.println("you want to lendname"); String bookname=input.next(); for(int i=0;i<name.length;i++){ if(name[i].equals(bookname)&&state[i].equals("1")){ System.out.println("can lend out"); state[i]="0"; System.out.println("the lend date is:"); date[i]=input.next(); break; } else if(name[i].equals(bookname)&&state[i].equals("0")){ System.out.println("the book is lendout can't lend again"); break; } else if(name[i]==null){ System.out.println("no this book"); } } } public void Return(){ System.out.println("the return bookname"); String rname=input.next(); for(int i=0;i<name.length;i++){ try{ if(name[i].equals(rname)){ state[i]="1"; Date d=sdf.parse(date[i]); System.out.println("the return date"); String q=input.next(); Date d1=sdf.parse(q); long price=((d1.getTime()-d.getTime())/(24*60*60*1000)); System.out.println("the 1 day's price:"); int danjia=input.nextInt(); int price1=(int)(danjia*price); System.out.println("return success"+"the money is"+price1); break; } }catch(ParseException ex){ } } } }

Answer 1

这么多代码，估计没人有那么多时间一行行的看代码，你应该把错误提示贴出来。

Answer 2

最好帖错误的提示。