To clear all selections, use the List clearSelection() method in Java −JList list = new JList(sports); list.clearSelection();Above, the elements in Sports array is a String array −String sports[]= { "Cricket", "Football", "Hockey", "Rugby"};The following is an example to clear all selection in JList −Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame {    static JFrame frame;    static JList list;    public static void main(String[] args) {       frame = new JFrame("JList Demo");       SwingDemo s = new SwingDemo();       JPanel panel = new JPanel();       String sports[]= ... Read More

To select the second index, use the setSelectedIndex() method −JList new JList(sports); list.setSelectedIndex(2);The following is an example to select the second index in Java JList −Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame {    static JFrame frame;    static JList list;    public static void main(String[] args) {       frame = new JFrame("JList Demo");       SwingDemo s = new SwingDemo();       JPanel panel = new JPanel();       String sports[]= { "Cricket","Football","Hockey","Rugby"};       list = new JList(sports);       list.setSelectedIndex(2);       panel.add(list);       frame.add(panel);       frame.setSize(400,400);       frame.setVisible(true);    } }Output

The following is an example to create JRadioButton from text −Examplepackage my; import java.awt.FlowLayout; import java.awt.event.KeyEvent; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JRadioButton; public class SwingDemo {    public static void main(String[] args) {       JRadioButton radio1 = new JRadioButton("Cricket");       JRadioButton radio2 = new JRadioButton("Football");       ButtonGroup group = new ButtonGroup();       group.add(radio1);       group.add(radio2);       radio1.setSelected(true);       JFrame frame = new JFrame();       frame.setLayout(new FlowLayout());       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       frame.add(new JLabel("Fav Sports:"));       frame.add(radio1);     ... Read More

To add background image to JFrame, use the getImage() method of the Image class −Image img = Toolkit.getDefaultToolkit().getImage("E:\rahul.jpg");Now, draw the image −public void paintComponent(Graphics g) {    super.paintComponent(g);    g.drawImage(img, 0, 0, null); }The following is an example to add Background Image to JFrame −Exampleimport java.awt.Graphics; import java.awt.Image; import java.awt.Toolkit; import java.io.IOException; import javax.swing.JPanel; public class SwingDemo extends javax.swing.JFrame {    Image img = Toolkit.getDefaultToolkit().getImage("E:\rahul.jpg");    public SwingDemo() throws IOException {       this.setContentPane(new JPanel() {          @Override          public void paintComponent(Graphics g) {             super.paintComponent(g);     ... Read More

To create a JFrame with no border and title bar, use setUndecorated() −JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setPreferredSize(new Dimension(400, 300)); frame.setUndecorated(true);The following is an example to create JFrame with no border and title bar −Exampleimport java.awt.Dimension; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class SwingDemo {    public static void main(String[] args) {       JFrame frame = new JFrame();       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       frame.setPreferredSize(new Dimension(400, 300)); frame.setUndecorated(true);       JPanel panel = new JPanel();       panel.add(new JLabel("Demo!"));       panel.add(new JButton(new AbstractAction("Close") {   ... Read More

Here, we are activating a frame. For deactivation, we have used dispose −Thread.sleep(2000); frame.setVisible(false);The frame first activates and then deactivates after 2 seconds since we have set sleep to 2000 miliseconds.The following is an example to activate and deactivate JFrame −Exampleimport java.awt.Frame; import javax.swing.JFrame; import javax.swing.JLabel; public class SwingDemo {    public static void main(String[] args) throws InterruptedException {       JFrame frame = new JFrame();       frame.add(new JLabel("Demo"));       frame.pack();       frame.setVisible(true);       Thread.sleep(2000);       frame.setState(Frame.ICONIFIED);       Thread.sleep(2000);       frame.setVisible(false);       frame.dispose(); ... Read More

To get directories from JFileChoose, use the mode setFileSelectionMode −JFileChooser file = new JFileChooser(); file.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);The following is an example to get Directories from JFileChooser −Exampleimport javax.swing.JFileChooser; public class SwingDemo {    public static void main(String[] args) {       JFileChooser file = new JFileChooser(); file.setMultiSelectionEnabled(false);          file.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);       int res = file.showOpenDialog(null);       if (res == JFileChooser.APPROVE_OPTION) { java.io.File f = file.getSelectedFile();          System.err.println(f.getPath());       }    } }Output

The following is an example to display the contents of a text file in JTextArea −Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo {    private JFrame mainFrame;    private JLabel statusLabel;    private JPanel controlPanel;    public SwingDemo() {       prepareGUI();    }    public static void main(String[] args) {       SwingDemo demo = new SwingDemo();       demo.showTextAreaDemo();    }    private void prepareGUI() {       mainFrame = new JFrame("Java Swing");       mainFrame.setSize(400, 400);       mainFrame.setLayout(new GridLayout(3, 1));       mainFrame.addWindowListener(new WindowAdapter() {     ... Read More

To create FileFilter, use the FileNamExtensionFilter class. The following is an example to display File Type in JFileChooser −Exampleimport javax.swing.JFileChooser; import javax.swing.filechooser.FileNameExtensionFilter; public class SwingDemo {    public static void main(String[] args) {       JFileChooser file = new JFileChooser();       file.setAcceptAllFileFilterUsed(false);       FileNameExtensionFilter extFilter = new FileNameExtensionFilter("JPEG file", "jpg", "jpeg");       file.addChoosableFileFilter(extFilter);       file.showOpenDialog(null);    } }Output

The JDialog Modality type APPLICATION_MODAL blocks all top-level windows and it has restrictions. The following is an example to set JDialog with Modality type APPLICATION_MODAL:Exampleimport java.awt.Cursor; import java.awt.Dialog.ModalityType; import java.awt.Dimension; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; public class SwingDemo {    public static void main(String[] args) {       JFrame frame = new JFrame();       frame.setSize(new Dimension(600, 400));       JDialog dialog = new JDialog(frame, "New", ModalityType.APPLICATION_MODAL);       dialog.setSize(300, 300);       frame.add(new JButton(new AbstractAction("Click to generate") {          @Override          public void ... Read More