Java图书查询系统实例（简化精炼版及部分更正）

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);

}
public NoExistException(){

}
}

import java.util.*;
public class Test2 {
private Scanner input = new Scanner(System.in);
Book[] book={
new Book("语文",1),
new Book("数学",2),
new Book("英语",3),
new Book("专业课",4)

};
//	 public List<Book> listbooks;
//	 public Test2() {
//         this.listbooks = new ArrayList<Book>();
//         }
//     public void listBooksAdd() {
//         listbooks.addAll(Arrays.asList(book));
//         }
public void printbook(){
System.out.println("====欢迎使用选书系统====");
System.out.println("=====书本信息如下：=====");
System.out.println("序号"+"\t"+"书名");
for(Book bk:book){
System.out.println(bk.getNum()+"\t"+bk.getName());
}
}

public static void main(String[] args) {
Test2 tc=new Test2();
//			tc.listBooksAdd();
tc.printbook();

while(true){
System.out.println("请选择查书方式1-通过序号2-通过书名：");
switch(tc.back()){
case 1:
try{
System.out.println("您的书为："+tc.fbid());
break;
}catch(Exception e){
System.out.println(e.getMessage());
continue;
}
case 2:
try{
System.out.println("您的书为："+tc.fbbn());
break;
}catch(Exception e){
System.out.println(e.getMessage());
continue;
}
default:
System.out.println("输入错误！请重新输入！！！");
continue;
}break;
}

}
public String fbid() throws NoExistException{
System.out.println("请输入图书的序号：");
int in=input.nextInt();
for(Book bk:book){
if(in==bk.getNum()){
return book[in-1].getName();
}
}
throw new NoExistException("序号越界请重新输入");
}
public String fbbn()throws NoExistException{
System.out.println("请输入图书的书名：");
String in=input.next();
for(Book bk:book){
if(in.equals(bk.getName())){
return bk.getName();
}
}
throw new NoExistException("此书不存在");

}
public int back(){
int in=input.nextInt();
return in;
}
}