借书系统 -java 第三季自定义异常类

public class Book {
     private  int id =0;
     private String name = null;
     public  int getId() {
        return id;
    }
    public String getName() {
        return name;
    }
//Book构造方法
    public Book(int ID,String NAME){
         this.id =ID;
         this.name =NAME;
     }
//toString 方法
    public String toString(){
        return "ID:"+id +"\t书名" + name ;
    }
}

public class MyException extends Exception {
//自定义异常类
    String message;
    public MyException(String EMessage){
        message =EMessage;
    }
    public String getMessage() {
        return message;
    }
}

import java.util.Scanner;
public class Test {
//创建对象与array数组
    static  Book b1 =new Book(1,"书1");
    static  Book b2 =new Book(2,"书2");
    static  Book b3 =new Book(3,"书3");
    static  Book[] array =new Book[]{b1,b2,b3};
//判断查找方式(input1())  
    public static int input1() throws MyException{
        System.out.println("请输入数字命令：");
        System.out.println("1-按照书名查找图书\t2-按照序号查找图书");
        Scanner input1 =new Scanner(System.in);
        int in1 =input1.nextInt();
        if(in1!=1 && in1!=2){
            throw new MyException("错误命令异常");
        }
        return in1;
    }
//通过书名
    public static String input2() throws MyException{
        System.out.println("请输入书名:");
        Scanner input2 =new Scanner(System.in);
        String in2 =input2.nextLine();
//创建新字符串数组
        String[] n =new String[3];
        boolean torf =true;
//循环遍历数组,新数组与array对比,判断书是否存在
        for(int i =0;i<array.length;i++){
            n[i]=array[i].getName();
            if(n[i].equals(in2)==true){
                torf =false; 
            }else if(i ==array.length-1){
                System.out.println(array[i].toString());
            }
            break;
        }
        if(torf ==true){
            throw new MyException("图书不存在异常");
        }
        return in2;
    }
//通过序号
    public static int input3() throws MyException{
        System.out.println("请输入序号:");
        Scanner input3 =new Scanner(System.in);
        int in3 =input3.nextInt();
        if(in3<=0||in3>array.length){
            throw new MyException("图书不存在异常");
        }else{
            System.out.println(array[in3-1].toString());
        }
        return in3;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        boolean judge = false;
//循环try-catch
        do{
            try{
                switch(input1()){
                case 1: 
                    input2();
                    break;
                case 2:
                    input3();
                    break;
                }
                System.out.println("谢谢使用!");
                judge =true;
            }catch(MyException e){
                //e.printStackTrace();
                System.out.println(e.getMessage());
                System.out.println("请重新输入!");
            }
        }while(judge ==false);
        }
}