Java无法读取输入

import java.util.Scanner;

public class InputExample {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入一个整数：");
        int num = scanner.nextInt();
        System.out.println("您输入的整数是：" + num);
        scanner.close();
    }
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class InputExample {
    public static void main(String[] args) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        try {
            System.out.print("请输入一行文本：");
            String line = reader.readLine();
            System.out.println("您输入的文本是：" + line);
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class InputExample {
    public static void main(String[] args) {
        if (args.length > 0) {
            int num = Integer.parseInt(args[0]);
            System.out.println("您输入的整数是：" + num);
        } else {
            System.out.println("请在命令行参数中输入一个整数。");
        }
    }
}