实现代码如下
复制粘贴格式化，我还没调试，如果有错误可以回复分享一下。
package com.booksearch;
import java.util.*;
public class BookSearch {
public static void main(String[] args) {
String[] books = { "数据结构", "高数", "论语" };
boolean flag = true;
while (flag) {
try {
System.out.println("输入命令：1.按照名称查图书；2.按照序号查图书");
Scanner input = new Scanner(System.in);
int cmdnum = input.nextInt();
if (cmdnum == 1) {
System.out.println("输入图书名称：");
String name = input.next();
for (String book : books) {
if (book.equals(name)) {
System.out.println("book:" + book);
flag = false;
break;
}
}
if (flag) {
System.out.println("图书不存在");
continue;
}
} else if (cmdnum == 2) {
System.out.println("输入图书序号：");
int id = input.nextInt();
for (int i = 0; i < books.length; i++) {
if (id > 0 && id <= books.length) {
System.out.println("book:" + books[id - 1]);
flag = false;
break;
}
}
if (flag) {
System.out.println("图书不存在");
continue;
}
}
} catch (Exception e) {
System.out.println("命令输入错误！请输入数字命令！");
continue;
}
}
}
}
