感觉不需要抛出

package com.qmx;

import java.util.Scanner;

public class FindBook {

String book[] = {"高数","数据结构"};

public static void main(String[] args) {

// TODO Auto-generated method stub

FindBook fb = new FindBook();

fb.findb();

}

public void findb() {

try {

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 input1 = new Scanner(System.in);

int type = input1.nextInt();

chooseBookBy(type);

} catch (Exception e) {

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

findb();

}

}

public void chooseBookBy(int type) {

if(type == 1) {

System.out.println("输入图书名称");

Scanner input = new Scanner(System.in);

String bookName = input.nextLine();

if(container(book, bookName) == true) {

System.out.println("book:" + bookName);

} else {

System.out.println("图书不存在");

findb();

}

} else {

try {

System.out.println("输入图书序号");

Scanner input = new Scanner(System.in);

int index = input.nextInt();

if(index>=0 && index < book.length) {

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

} else {

System.out.println("图书不存在");

findb();

}

} catch (Exception e) {

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

chooseBookBy(2);

}

}

}

public boolean container (String[] arr, String str) {

for(String s: arr) {

if(s.equals(str)) {

return true;

}

}

return false;

}

}