作业写完了

package Demo;

import java.util.Scanner;

public class BorrowBook {

public static void main(String[] args) {

BorrowBook test=new BorrowBook();

test.bobo();

}

public void bobo(){

String Books[]= {"数据结构","高数","java语言","英语"};

System.out.println("*******欢迎来到慕课网借书系统*******");

System.out.println("输入命令：1-按照名称查找图书；2-按照序号查找图书");

Scanner input=new Scanner(System.in);

try{

int num=input.nextInt();

if(num==1){

System.out.println("输入图书名称：");

Scanner input1=new Scanner(System.in);

String Bookname =input1.nextLine();

int a=-1;

for(int i=0;i<Books.length;i++) {

if(Books[i].equals(Bookname)) {

System.out.println("book:"+Books[i]);

System.out.println("*************您借书成功*************");

a=1;

}

}

if(a==-1) {

throw new NobookException("图书不存在!");

}

}else if(num==2){

System.out.println("输入图书名序号：");

Scanner input2=new Scanner(System.in);

    int Booknum =input2.nextInt();

if(Booknum>0&&Booknum<=Books.length) {

System.out.println("book:"+Books[Booknum-1]);

System.out.println("*************您借书成功*************");

}else {

throw new NobookException("图书不存在!");

}

}

}catch(NobookException e) {

System.out.println(e.getMessage());

bobo();

// }catch(ErrorCodeException e){

//     System.out.println("命令输入错误！请根据提示输入数字命令");

// bobo();

}catch(Exception e){

    System.out.println("命令输入错误！请根据提示输入数字命令");

bobo();

}

}

}