【交作业啦】
//自定义异常1：命令错误异常
package com.imooc.exceptionTest;
public class wrongCommandException extends Exception {
public wrongCommandException() {
}
public wrongCommandException(String message) {
super(message);
}
}
//自定义异常2：图书不存在异常
package com.imooc.exceptionTest;
public class wrongNameException extends Exception {
public wrongNameException() {
}
public wrongNameException(String message) {
super(message);
}
}
//测试类
package com.imooc.exceptionTest;
import java.util.Arrays;
import java.util.Scanner;
public class BorrowE {
public static void main(String[] args) {
BorrowE borrow = new BorrowE();
borrow.select();
}
public void select() {
String[] books = new String[] {"数据结构","Java从入门到精通","计算机网络","操作系统","数字图像处理"};
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{
if(input.hasNextInt()) {
int in = input.nextInt();
if(in==1) {
System.out.println("输入图书名称：");
Scanner input2 = new Scanner(System.in);
String inM = input2.nextLine();
boolean flag = Arrays.asList(books).contains(inM);
if(flag) {
System.out.println(inM+"存在！");
}else {
throw new wrongNameException();
}
}else if(in==2) {
System.out.println("输入图书序号：");
int inN = input.nextInt();
if(inN>=0 && inN<books.length) {
System.out.println("你要查询的图书名称为："+books[inN]);
}else {
throw new wrongNameException();
}
}else {
throw new wrongCommandException();
}
}else {
throw new wrongCommandException();
}
}catch(wrongCommandException e){
System.out.println("命令错误！请根据提示输入数字命令！");
select();
}catch(wrongNameException e) {
System.out.println("图书不存在！");
select();
}
}
}
