困扰了一晚上的Scanner，还是不知道在哪里close？
package com.imooc;
import java.util.Scanner;
public class LibraryTest {
private static String[] books = new String[] {"语文", "数学", "英文", "政治", "历史", "物理", "化学"};
public static void main(String[] args) {
LibraryTest lt = new LibraryTest();
while(lt.searchBook() != 0) // 进入查找图书系统
System.out.println("图书不存在！");
}
public int searchBook() {
int ret = -1;
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");
try {
Scanner input = new Scanner(System.in);
int cmd = input.nextInt();
switch (cmd) {
case 1:
ret = searchBookByName();
break;
case 2:
ret = searchBookByIndex();
break;
default:
System.out.println("命令输入错误！请根据提示输入数据命令");
break;
}
} catch(Exception e) {
System.out.println("命令输入错误！请根据提示输入数据命令");
}
return ret;
}
private int searchBookByName() {
System.out.println("输入图书名称：");
Scanner input = new Scanner(System.in);
String name = input.nextLine();
for (String book : books) {
if (book.equals(name)) {
System.out.println("book: " + name);
return 0;
}
}
return -1;
}
private int searchBookByIndex() {
System.out.println("输入图书序号：");
Scanner input = new Scanner(System.in);
int index = input.nextInt();
if (index >= 0 && index < books.length) {
System.out.println("book: " + books[index]);
return 0;
}
return -1;
}
}
