Java text input question...why won't anything come up?

Question

So I wrote this program. I want to get a text field that a person can write text into. If you notice at the very end, I gave it a shot and I've tried a few other things. I can't even get a text box to appear. Help! Give me something I can go off of...

Thank you so much!

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.geom.Ellipse2D;
import java.text.NumberFormat;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextArea;

public class windowName {

	public static void main(String[] args) {

		EventQueue.invokeLater(new Runnable(){

			public void run(){

				SimpleFrame frame = new SimpleFrame();
				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				frame.setVisible(true);

			}

		});

	}

}



class SimpleFrame extends JFrame {
	public SimpleFrame(){

		//The following four lines create the screenWidth and screenHeight variables
		Toolkit kit = Toolkit.getDefaultToolkit();
		Dimension screenSize = kit.getScreenSize();
		int screenWidth = screenSize.width;
		int screenHeight = screenSize.height;

		//The following lines are the properties of the frame itself
		setSize(screenWidth/3, screenHeight/2);
		setTitle("We're going to take your name!");
		setLocation(screenWidth/3,screenHeight/4); //These numbers center the window on the screen
		getContentPane().setBackground(Color.black);
		getContentPane().setForeground(Color.white);

		//The following 2 lines create a new panel (which will be used to draw a circle)
		DrawComponent component = new DrawComponent();
		add(component);

	}
}



class DrawComponent extends JComponent{

		JTextArea text = new JTextArea("This is a test.",20,20); //Why isn't this creating a text field??

	}

}

Anonymous · Accepted Answer

The code is all wrong

Mark aka jack573 · Answer

There are two things you have to do to get the DrawComponent to show.

//The following 2 lines create a new panel (which will be used to draw a circle)
DrawComponent component = new DrawComponent();
add(component);

Change these lines to:
//The following 2 lines create a new panel (which will be used to draw a circle)
DrawComponent component = new DrawComponent();
getContentPane().add(component);


class DrawComponent extends JComponent{

JTextArea text = new JTextArea("This is a test.",20,20); //Why isn't this creating a text field??

Change this to:
class DrawComponent extends JComponent{

JTextArea text = new JTextArea("This is a test.",20,20); //Why isn't this creating a text field??
add(text);

That should show it.

Reasons being:
1. You are not adding the DrawComponent to the contentPane of the SimpleFrame.
2. You are not adding the text to the DrawComponent.

alpha_centauri_75 · Answer

In DrawComponent you are just subclassing JComponent and adding a field called text. That won't affect the drawing of the component. Check out the paint() method.

That said, you extremely rarely have to subclass JComponent. Instead of add(component). Just do getContentPane().add(new JTextField()). And you probably want a pack() at the end.

Anonymous · Answer

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Java text input question...why won't anything come up?

4 Answers