Scanner hasNextInt

Posted 2022-03-26 hellsino

import java.util.Scanner;

public class TestScanner 
    public static void main(String[] args) 
        Scanner in = new Scanner(System.in);
        int num;
        while (true) 
            System.out.println("输入整型数字:");
            if (in.hasNextInt()) 
                num = in.nextInt();
                break;
             else 
                System.out.println("输入有误！");
                in.next();