JFrame doesn't show

Question

I have the next problem: I'm calling a class from my Main, that have to show a JFrame. I can't even continue with my program because when I try to run it, the JFrame doesn't show. I'm using Eclipse.

Main:

package System;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.awt.Menu;
import java.awt.*;

import javax.*;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;

public class Main {


    public static void main(String[] args) {

        new Menu();

    }   
}

Second class:

package System;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.awt.*;
import javax.*;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;

public class Menu {

    private JFrame ventana = new JFrame("Sistema de Productos Químicos");
    private JButton sup = new JButton("Supervisor");
    private JButton oper = new JButton("Operario");

    Menu()
    {
        ventana.setSize(500,500);
        ventana.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        ventana.add(sup);
        ventana.add(oper);

        ventana.setVisible(true);
    }

}

Thanks!

Answer 1

because your jframe class name is Menu and you have import

import java.awt.Menu;

this create a new awt menu instead of your Menu class which create a jframe

new Menu();

to fix this change the name of the Menu class to something different.

for instance

public class MyMenu { //

Answer 2

如果你玩弄 System.out.println("Say something random")，这是当你的程序不工作并且不是语法错误时要做的事情，你会发现 Main 类甚至没有调用 Menu 类，以便“减少”您的搜索区域，我还没有发现问题，当我发现时会更新答案。