代码有抛出异常，但是运行是没有显示异常语句，是什么情况
package com.imooc.proj_1;
import java.util.Scanner;
public class BookManagerEasy {
private static Scanner console = new Scanner(System.in);
public static void main(String[] args) {
//定义”图书“数组
String[] books = { "C语言", "数据结构", "汇编语言", "高数", "大学语文", "毛概" };
while (true) {
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");
String book;
try {
//取得整型命令
int command = inputCommand();
//根据不同命令值，进行不同操作
switch (command) {
case 1://按照图书名称选择图书
book = getBookByName(books);
System.out.println("book:" + book);
break;
case 2://按照图书序号（数组下标）选择图书
book = getBookByNumber(books);
System.out.println("book:" + book);
break;
case -1://返回值为-1，说明输入有误
System.out.println("命令输入错误！请根据提示输入数字命令！");
continue;
default://其他值的命令均认为是错误命令
System.out.println("命令输入错误！");
continue;
}
break;//退出程序
} catch (Exception bne) {
//捕获”图书不存在异常“时，要求重新输入命令
System.out.println(bne.getMessage());
continue;
}
}
}
//按照图书名称查询图书
private static String getBookByName(String[] books)
throws Exception {
System.out.println("输入图书名称：");
//获取输入的图书名称
String name = console.next();
for (int i = 0; i < books.length; i++) {
if (name.equals(books[i]))
//输入的名称与某一图书名称匹配，返回该图书
return books[i];
}
//若无匹配，抛出”图书不存在异常“
throw new Exception("图书不存在！");
}
//根据图书序号（数组下标）查询图书
private static String getBookByNumber(String[] books)
throws Exception {
while (true) {
System.out.println("输入图书序号：");
try {
//获取输入的图书序号（数组下标）
int index = inputCommand();
//若返回值为-1
if(index == -1){
System.out.println("命令输入错误！请根据提示输入数字命令！");
continue;
}
//若不出现”数组下标越界异常“，则返回相应位置的图书
String book = books[index];
return book;
} catch (ArrayIndexOutOfBoundsException e) {
//输入的序号不存在（引发”数组下标越界异常“），则抛出”图书不存在异常“
Exception bookNotExists = new Exception("图书不存在！");
bookNotExists.initCause(e);
throw bookNotExists;
}
}
}
//从控制台输入命令，用于输入命令和输入图书序号
private static int inputCommand(){
int command;
try {
command = console.nextInt();
return command;
} catch (Exception e) {
//若输入字符型或者字符串，则抛出异常，捕获该异常，抛出”错误命令异常“
console = new Scanner(System.in);
//返回-1
return -1;
}
}
}
package imooc.com;
import java.util.Scanner;
public class Name {
public Name() {
}
public void findName(String[] book) throws Exception {
System.out.println("请输入图书名：");
Scanner scan = new Scanner(System.in);
try {
String name = scan.next();
for (int i = 0; i < book.length; i++) {
if (name.equals(book[i]))
System.out.println("book:" + book[i]);
}
} catch (Exception e) {
throw new Exception("图书不存在！");
}
}
public void findId(String[] book) throws Exception {
System.out.println("请输入图书序号：");
Scanner scan = new Scanner(System.in);
try {
int i = scan.nextInt();
if (i >= 0 && i < book.length) {
System.out.println("book:"+book[i]);
}
} catch (Exception e) {
throw new Exception("图书不存在！");
}
}
}
********************************
package imooc.com;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
String[] book = { "高数", "数据结构", "英语", "c++" };
while (true) {
int i;
System.out.println("请按照提示输入：1-根据序号查书，2-根据书名查书");
try {
Scanner scan = new Scanner(System.in);
i = scan.nextInt();
Name n = new Name();
switch (i) {
case 1:
try {
n.findId(book);
} catch (Exception e) {
System.out.println(e.getMessage());
continue;
}
break;
case 2:
try {
n.findName(book);
} catch (Exception e) {
System.out.println(e.getMessage());
continue;
}
break;
default:
break;
}
} catch (Exception e) {
System.out.println("命令输入错误，请根据提示输入！");
continue;
}
}
}
}
可以看看代码吗？
试试在软件上自己敲一遍