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