I have created three classes(one for main, frame, for panel) in java swing. After adding components they are not visible in the frame. Why?

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Java

//Main Class:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Order
{
	public static void main(String[] args)
	{
		OrderFrame frame = new OrderFrame();
	}
}

//Frame Class:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class OrderFrame extends JFrame
{
	OrderFrame()
	{
		setTitle("Place Order");
		setLayout(null);
		setSize(500,500);
		this.add(new OrderPanel());
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

//Panel Class:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class OrderPanel extends JPanel implements ActionListener
{	
	JLabel l1,l2;
	JButton b1;
	public OrderPanel()
	{
		l1 = new JLabel("Welcome to Online Food Delivery System");
		b1 = new JButton("Close Window");
		b1.addActionListener(this);
		add(l1);
		add(b1);
	}
	public void actionPerformed(ActionEvent e) 
	{
		System.exit(0);
	}
}

What I have tried:

I still have to write a lot of code, but I if I run the Main Class(Class name - order) I should get a GUI with a Label and a button. But I get a blank GUI. I tried writing this.add(b1) and this.add(l1) but with no change. What am I missing?

Posted 26-May-17 18:39pm

Member 13225387

Updated 26-May-17 21:20pm

Maciej Los

v2

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Maciej Los · Accepted Answer · 2017-05-26T21:20:00

I'd suggest to read this: Java JButton - javatpoint[^]

Java

import java.awt.event.*;
import javax.swing.*;
public class ButtonExample {
public static void main(String[] args) {
    JFrame f=new JFrame("Button Example");
    final JTextField tf=new JTextField();
    tf.setBounds(50,50, 150,20);
    JButton b=new JButton("Click Here");
    b.setBounds(50,100,95,30);
    b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
            tf.setText("Welcome to Javatpoint.");
        }
    });
    f.add(b);f.add(tf);
    f.setSize(400,400);
    f.setLayout(null);
    f.setVisible(true);
}
}

Based on above code, you missed this line:

Java

jcontrol.setBounds(50,50, 150,20);