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 JWindowimport 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);        }    }} |
Output :
Note : the above programs might nor run in an online compiler please use an offline IDE
