Java Swing | JWindow with examples

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JWindow is a part of Java Swing and it can appear on any part of the users desktop. It is different from JFrame in the respect that JWindow does not have a title bar or window management buttons like minimize, maximize, and close, which JFrame has. JWindow can contain several components such as buttons and labels.
Constructor of the class are:

JWindow() : creates an empty Window without any specified owner
JWindow(Frame o) :creates an empty Window with a specified frame as its owner
JWindow(Frame o) : creates an empty Window with a specified frame as its owner
JWindow(Window o) : creates an empty Window with a specified window as its owner
JWindow(Window o, GraphicsConfiguration g) : creates an empty window with a specified window as its owner and specified graphics Configuration.
JWindow(GraphicsConfiguration g) :creates an empty window with a specified Graphics Configuration g.

Commonly used methods

setLayout(LayoutManager m) : sets the layout of the Window to specified layout manager
setContentPane(Container c) : sets the ContentPane property of the window
getContentPane() : get the container which is the ContentPane for this Window
add(Component c): adds component to the Window
isVisible(boolean b): sets the visibility of the Window, if value of the boolean is true then visible else invisible
update(Graphics g) : calls the paint(g) function
remove(Component c) : removes the component c
getGraphics() : returns the graphics context of the component.
getLayeredPane() : returns the layered pane for the window
setContentPane(Container c) :sets the content pane for the window
setLayeredPane(JLayeredPane l) : set the layered pane for the window
setRootPane(JRootPane r) : sets the rootPane for the window
setTransferHandler(TransferHandler n) : Sets the transferHandler property, which is a mechanism to support transfer of data into this component.
setRootPaneCheckingEnabled(boolean enabled) : Sets whether calls to add and setLayout are forwarded to the contentPane.
setRootPane(JRootPane root) :Sets the rootPane property of the window.
setGlassPane(Component glass) : Sets the glassPane property of the window.
repaint(long time, int x, int y, int width, int height): Repaints the specified rectangle of this component within time milliseconds.
remove(Component c): Removes the specified component from the window.
isRootPaneCheckingEnabled() : Returns whether calls to add and setLayout are forwarded to the contentPane or not .
getTransferHandler() : returns the transferHandler property.
getRootPane() : Returns the rootPane object for this window.
getGlassPane() : Returns the glassPane object for this window.
createRootPane() : Called by the constructor methods to create the default rootPane.
addImpl(Component co, Object c, int i) : Adds the specified child Component to the window.

The following programs will illustrate the use of JWindow

1. program to create a simple JWindow

// java Program to create a simple JWindow
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
  
  
class solveit extends JFrame implements ActionListener {
  
    // frame
    static JFrame f;
  
    // main class
    public static void main(String[] args)
    {
        // create a new frame
        f = new JFrame("frame");
  
        // create a object
        solveit s = new solveit();
  
        // create a panel
        JPanel p = new JPanel();
  
        JButton b = new JButton("click");
  
        // add actionlistener to button
        b.addActionListener(s);
  
        // add button to panel
        p.add(b);
  
        f.add(p);
  
        // set the size of frame
        f.setSize(400, 400);
  
        f.show();
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        String s = e.getActionCommand();
        if (s.equals("click")) {
            // create a window
            JWindow w = new JWindow(f);
  
            // set panel
            JPanel p = new JPanel();
  
            // create a label
            JLabel l = new JLabel("this is a window");
  
            // set border
            p.setBorder(BorderFactory.createLineBorder(Color.black));
  
            p.add(l);
            w.add(p);
  
            // set background
            p.setBackground(Color.red);
  
            // setsize of window
            w.setSize(200, 100);
  
            // set visibility of window
            w.setVisible(true);
  
            // set location of window
            w.setLocation(100, 100);
        }
    }
}

Output :

1. program to create a multiple JWindow .( where one window is the owner of the other )

// java program to create a multiple  JWindow .( where one window is the owner of the other )<
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solveit extends JFrame implements ActionListener {
  
    // frame
    static JFrame f;
  
    // windows
    JWindow w, w1;
  
    // object of class
    static solveit s;
  
    // main class
    public static void main(String[] args)
    {
        // create a new frame
        f = new JFrame("frame");
  
        // create a object
        s = new solveit();
  
        // create a panel
        JPanel p = new JPanel();
  
        JButton b = new JButton("click");
  
        // add actionlistener to button
        b.addActionListener(s);
  
        // add button to panel
        p.add(b);
  
        f.add(p);
  
        // set the size of frame
        f.setSize(400, 400);
  
        f.show();
    }
  
    // if button is pressed
    public void actionPerformed(ActionEvent e)
    {
        String s1 = e.getActionCommand();
        if (s1.equals("click")) {
            // create a window
            w = new JWindow(f);
  
            // set panel
            JPanel p = new JPanel();
  
            // create a label
            JLabel l = new JLabel("this is first window");
  
            // create a button
            JButton b = new JButton("Click me");
  
            // add Action listener
            b.addActionListener(s);
  
            // set border
            p.setBorder(BorderFactory.createLineBorder(Color.black));
  
            p.add(l);
            p.add(b);
            w.add(p);
  
            // set background
            p.setBackground(Color.red);
  
            // setsize of window
            w.setSize(200, 100);
  
            // set visibility of window
            w.setVisible(true);
  
            // set location of window
            w.setLocation(100, 100);
        }
        else {
            // create a window
            w1 = new JWindow(w);
  
            // set panel
            JPanel p = new JPanel();
  
            // create a label
            JLabel l = new JLabel("this is the second window");
  
            // set border
            p.setBorder(BorderFactory.createLineBorder(Color.black));
  
            p.add(l);
  
            w1.add(p);
  
            // set background
            p.setBackground(Color.blue);
  
            // setsize of window
            w1.setSize(200, 100);
  
            // set visibility of window
            w1.setVisible(true);
  
            // set location of window
            w1.setLocation(210, 210);
        }
    }
}