刚学java的小白想问个关于读取键盘输入数字的问题

import java.util.*;

public class Main {

public static void main(String[] args) {

Main main= new Main();

Menu start = new Menu();

main.checkId();

System.out.println("欢迎。。");

Scanner sc = new Scanner(System.in);

int select = sc.nextInt();

switch(select) {

case 1:;

}

}

//检查登录

private void checkId() {

//用来读取输入

Scanner input = new Scanner(System.in);

Boolean loginStatus = false;

//记录密码错误次数

int count = 0;

while(loginStatus == false) {

if(count >= 3) {

System.out.println("错误超过三次，账号冻结");

System.exit(-1);

}

System.out.println("请输入账号:");

String name = input.next();

System.out.println("请输入密码:");

String password = input.next();

if("admin".equals(name) && "admin".equals(password)) {

loginStatus = true;

//记得关闭扫描器

input.close(); 

System.out.println("登录成功");

break;

} else {

System.out.println("账号或密码错误，请重新输入");

count++;

}

}

}

Exception in thread "main" java.util.NoSuchElementException

at java.util.Scanner.throwFor(Scanner.java:907)

at java.util.Scanner.next(Scanner.java:1530)

at java.util.Scanner.nextInt(Scanner.java:2160)

at java.util.Scanner.nextInt(Scanner.java:2119)更多0

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原文：http://www.cnblogs.com/xsns/p/6680935.html