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Java Articles
Page 379 of 450
How to select the second index in Java JList?
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
Read MoreHow can we clear all selections in Java Swing JList?
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 MoreGet JFrame window size information in Java
To get JFrame window size information, you can use the following −environment.getMaximumWindowBounds();For Screen Size −config.getBounds()For Frame Size −frame.getSize());The following is an example to get JFrame window size information −Exampleimport java.awt.GraphicsConfiguration; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import java.awt.Rectangle; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) { GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment(); Rectangle bounds = environment.getMaximumWindowBounds(); System.out.println("Screen Bounds = " + bounds); GraphicsDevice device = environment.getDefaultScreenDevice(); GraphicsConfiguration config = device.getDefaultConfiguration(); System.out.println("Screen Size = " + config.getBounds()); JFrame frame ...
Read MoreHow to set minimum size limit for a JFrame in Java
Use the setMinimumSize() method to set the minimum size limit for a JFrame −JFrame frame = new JFrame(); frame.setMinimumSize(new Dimension(500, 300));The following is an example to set minimum size limit for a JFrame −Exampleimport java.awt.Color; import java.awt.Dimension; import javax.swing.JButton; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame(); JButton button = new JButton("Close!"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setContentPane(button); button.addActionListener(e -> { frame.dispose(); }); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setMinimumSize(new Dimension(500, ...
Read MoreHow to set default button for JFrame in Java?
To set default button for JFrame, use the setDefaultButton() method −JFrame frame = new JFrame(); frame.getRootPane().setDefaultButton(button);The following is an example to set default button for JFrame −Exampleimport java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.JButton; import javax.swing.JFrame; public class SwingDemo { public static void main(String args[]) { JButton button = new JButton("Demo Button!"); JFrame frame = new JFrame(); frame.setSize(500, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getRootPane().setDefaultButton(button); button.setMnemonic(KeyEvent.VK_A); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { ...
Read MoreDraw a border around an undecorated JFrame in Java
At first, set an undecorated frame −setUndecorated(true);Now draw a border −getRootPane().setBorder (.createMatteBorder(3, 3, 3, 3, Color.ORANGE));The following is an example to draw a border around an undecorated JFrame −Exampleimport java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; public class SwingDemo extends JFrame { JLabel label = new JLabel("Welcome!", JLabel.CENTER); public SwingDemo() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(new Dimension(500, 300)); add(label, BorderLayout.CENTER); setUndecorated(true); getRootPane().setBorder( BorderFactory.createMatteBorder(3, 3, 3, 3, Color.ORANGE)); setVisible(true); } public static void main(String[] args) { new SwingDemo(); } }Output
Read MoreHow to create modeless and model JDialog in Java?
MODELESS TypeThe following is an example to set JDialog with Modality type MODELESS −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.MODELESS); dialog.setSize(300, 300); frame.add(new JButton(new AbstractAction("Click to generate") { @Override public void actionPerformed(ActionEvent e) { frame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); ...
Read MoreHow to change JLabel font in Java
To change JLabel font, use the setFont() method −JLabel lable = label.setFont(new Font("Verdana", Font.PLAIN, 18));Examplepackage my; import java.awt.Font; import javax.swing.*; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Label Example"); JLabel label; label = new JLabel("First Label"); label.setBounds(50, 50, 100, 30); label.setFont(new Font("Verdana", Font.PLAIN, 18)); frame.add(label); frame.setSize(300,300); frame.setLayout(null); frame.setVisible(true); } }Output
Read MoreHow to add tooltip to JLabel in Java?
Tooltip is visible whenever you will place the mouse cursor on the label. Use the setToolTipText() method to add tooltip to JLabel −label.setToolTipText("This is a demo tooltip");The following is an example to add tooltip to JLabel −Exampleimport java.awt.Color; import java.awt.Font; import javax.swing.*; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); JLabel label; label = new JLabel("Demo Label!"); label.setFont(new Font("Verdana", Font.PLAIN, 14)); label.setToolTipText("This is a demo tooltip"); Border border = BorderFactory.createLineBorder(Color.ORANGE); ...
Read MoreHow to filter String list by starting value in Java?
Let’s first create a String list −List list = new ArrayList(); list.add("wxy"); list.add("zabc"); list.add("ddd2"); list.add("def"); list.add("ghi"); list.add("wer"); list.add("uij"); list.add("wqy");To filter String list by starting value, use filter() and startsWith() −list.stream().filter((b) -> b.startsWith("w"))The following is an example to filter string list by starting value −Exampleimport java.util.ArrayList; import java.util.List; public class Demo { public static void main(final String[] args) { List list = new ArrayList(); list.add("wxy"); list.add("zabc"); list.add("ddd2"); list.add("def"); list.add("ghi"); list.add("wer"); list.add("uij"); list.add("wqy"); ...
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