Question

I have a Jwindow, and when I added a Jtextfield to it, the textfield became uneditable.

JWindow window = new JWindow();
window.setBounds(400, 100, 700,500);
window.setVisible(true);
window.setLayout(null);
JTextField text = new JTextField();
text.setBounds(300, 300, 150, 30);
text.setEditable(true);       
window.getContentPane().add(text);

But when I tried to use Jframe as Jwindow’s owner, the textfield was now editable, but the frame showed up together with the jwindow :

JFrame frame = new JFrame();
frame.setVisible(true);
JWindow window = new JWindow();
window.setBounds(400, 100, 700,500);
window.setVisible(true);
window.setLayout(null);
JTextField text = new JTextField();
text.setBounds(300, 300, 150, 30);
text.setEditable(true);       
window.getContentPane().add(text);

So, I have 2 questions :

1. Why JTextField is uneditable in JWindow and how could I make it editable?
2. What is the main purpose of using JFrame as JWindow’s border?

Answer 1

EDIT,

• contents of JWindow is accesible only if its parent is displayed on the screen

• for editable and accesible contents use un_decorated JDialog instead of JWindow, jDialog doesn’t caused non_accesible contents,

• reason why …, I can’t explain, not undestand why, no way in this moment, the API says me nothing about caused accesible, editable …

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.
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1. Why JTextField is uneditable in JWindow and how could i let it able to edit?

really don’t know

import java.awt.*;
import javax.swing.*;

public class WindowTest {

    private JFrame frame;

    public JPanel createContentPane() {
        JTextField text = new JTextField("Whatewer");        
        JPanel panel = new JPanel();
        panel.add(text);
        createAndShowWindow();
        return panel;
    }

    void createAndShowGUI() {
        frame = new JFrame("Window Test");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setContentPane(createContentPane());
        frame.setLocation(50, 50);
        frame.pack();
        frame.setVisible(true);
    }

    private void createAndShowWindow() {
        JTextField text = new JTextField("Whatewer");
        JWindow win = new JWindow(frame);
        win.setLayout(new GridLayout(0, 1));
        win.add(text);
        win.pack();
        win.setLocation(150, 50);
        win.setVisible(true);
    }

    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                new WindowTest().createAndShowGUI();
            }
        });
    }
}

EDIT

Yes, both are editable, and i wannt only JWindow to be displayed. Thanks!! 

• by default JWindow required JFrame for correct workaround

• nobody tell that this JFrame must be visible (valid for GUI), then remove these code lines from frame.setDefaultClose…. including frame.setVisible(true); from my example

• in this form current JVM instance never gone from RAM, untill your PC restarted or swith off, you have to add separated exit JButton with code line System.exit(0) inside ActionListener