在对话框中和java打个招呼吧

import javax.swing.*;
import java.util.Scanner;

public class hi {
    
    
    public static void main(String[] args) {
    
    
        Scanner sc = new Scanner(System.in);
        JOptionPane.showMessageDialog(null, "hi!");
        String yourname=JOptionPane.showInputDialog(null, "你叫什么名字？");
        JOptionPane.showMessageDialog(null, "hi!"+yourname);
        System.exit(0);
    }
}