public class Book {
private String name;
private int num;public Book(String name,int num){
this.name=name;
this.num=num;}public String getName() {return name;
}public void setName(String name) {this.name = name;
}public int getNum() {return num;
}public void setNum(int num) {this.num = num;
}}

public class NoExistException extends Exception {
public NoExistException(String message){super(message);
}
}

import java.util.*;
public class Test {Book[] book = {new Book("语文",1),new Book("数学",2),new Book("外语",3), new Book("Java编程",4)}; public List<Book> listbooks;public Test() { this.listbooks = new ArrayList<Book>(); } public void listBooksAdd() { listbooks.addAll(Arrays.asList(book)); } public void printBooks() { System.out.println("---------- 欢迎使用借书系统 ----------"); System.out.println("图书列表展示如下："); System.out.println("序号" + "\t" + "书名");for (Book bk : listbooks) { System.out.println(bk.getNum() + "\t" + bk.getName()); } }private Scanner input = new Scanner(System.in);public static void main(String[] args) {// TODO Auto-generated method stubTest fb=new Test();fb.listBooksAdd();fb.printBooks(); System.out.println();while(true){System.out.println("请输入您的命令：1.按名称查找\t2.按序号查找");switch(fb.wr()){case 2:try{System.out.println("book:"+fb.fbid());break;}catch(Exception e){System.out.println(e.getMessage());continue;}case 1:try{System.out.println("book:"+fb.fbbn());break;}catch(Exception e){System.out.println(e.getMessage());continue;}default:System.out.println("错误，请重新输入");continue;}}}
public String fbid()throws NoExistException{System.out.println("请输入书 的序号");int in=input.nextInt();for(Book bk : listbooks){if(in==bk.getNum()){return book[in-1].getName();}}throw new NoExistException("序号越界，此书籍不存在！！！");
}public String fbbn()throws NoExistException{System.out.println("请输入书的名称");String bname=input.next();for(Book bk:listbooks){if(bname.equals(bk.getName())){return bk.getName();  }}throw new NoExistException("名称错误，此书籍不存在！！！");
}
public int wr(){try{int in=input.nextInt();return in;}catch(Exception e){return -1;    }
}
}