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Java Articles
Page 377 of 450
How to set action command to JButton in Java
With set action command, here we are displaying a message in the console on the click of a button.Set the button first:JButton btn = new JButton("Demo Button");Now, set Action Listener to fire when the button is clicked:ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent event) { String str = event.getActionCommand(); System.out.println("Clicked = " + str); } };The following is an example to set action command to JButton:Exampleimport java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JOptionPane; public class SwingDemo { public static void main(final String args[]) { JButton btn ...
Read MoreI want to call JButton doClick() method to simulate a click action in Java
Let us first set a JButton:JButton btn = new JButton("DemoButton");Now, attach action listener:btn.addActionListener(new ClickListener());If you have an ActionListener attached to your button it'll fire when you call the method doClick():btn.doClick();The following is an example to call JButton doClick() method to simulate a click action:Exampleimport java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JOptionPane; public class SwingDemo { public static void main(final String args[]) { JButton btn = new JButton("DemoButton"); btn.addActionListener(new ClickListener()); JOptionPane.showMessageDialog(null, btn); btn.doClick(); } } class ClickListener implements ActionListener { public void actionPerformed(ActionEvent e) { ...
Read MoreHow to change JButton font dynamically in Java?
The following is an example to change JButton font dynamically:Exampleimport java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; public class SwingDemo extends JFrame { JButton button = new JButton("Change"); int fontSize = 10; public SwingDemo() { setSize(500, 400); setDefaultCloseOperation(EXIT_ON_CLOSE); add(button); // changing font size dynamically on button click button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ev) { button.setFont(new Font("Dialog", Font.PLAIN, ++fontSize)); button.revalidate(); } }); setVisible(true); } public static void main(String[] args) { new SwingDemo(); } }OutputClick “Change” button above to change the font:
Read MoreHow to disable JCheckBox if not checked in Java
The following is an example to disable JCheckBox if not checked in Java:Exampleimport java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JCheckBox; import javax.swing.JOptionPane; public class SwingDemo { public static void main(String[] args) { JCheckBox checkBox = new JCheckBox("Demo", true); checkBox.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (checkBox.isEnabled()) checkBox.setEnabled(false); else checkBox.setEnabled(true); } }); JOptionPane.showMessageDialog(null, checkBox); } }OutputNow, when you will uncheck the above checkbox, it will get disabled:
Read MoreHow to get or set the selection state of JCheckBox in Java
The following is an example to get or set the selection state of JCheckBox:Exampleimport java.awt.FlowLayout; import javax.swing.JCheckBox; import javax.swing.JFrame; public class SwingDemo extends JFrame { public SwingDemo() { setSize(500, 500); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLayout(new FlowLayout(FlowLayout.CENTER)); JCheckBox checkBox = new JCheckBox("Demo"); checkBox.setSelected(true); boolean sel = checkBox.isSelected(); if (sel) System.out.println("Check box selected!"); getContentPane().add(checkBox); } public static void main(String[] args) { new SwingDemo().setVisible(true); } }OutputSince the checkbox is selected by default, the following output would be visible in EclipseIDE:
Read MoreHow to change JLabel background and foreground color in Java?
To change the JLabel foreground and background color, use the following methods:JLabel label; label.setForeground(new Color(120, 90, 40)); label.setBackground(new Color(100, 20, 70));The following is an example to change JLabel background and foreground color: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("This is demo label!", JLabel.RIGHT); label.setVerticalAlignment(JLabel.TOP); label.setFont(new Font("Verdana", Font.PLAIN, 15)); label.setForeground(new Color(120, 90, 40)); label.setBackground(new Color(100, 20, 70)); ...
Read MoreHow to hide and display JCombobox with a JCheckBox in Java?
To toggle visibility with JCheckBox, use isVisible() method:JCheckBox toggleVisibility = new JCheckBox("Hide/Show"); toggleVisibility.setSelected(comboBox.isVisible()); toggleVisibility.addItemListener(e -> { comboBox.setVisible(e.getStateChange() == ItemEvent.SELECTED); });The following is an example to hide and display JCombobox with a JCheckBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ItemEvent; import javax.swing.*; public class SwingDemo { JFrame frame; SwingDemo(){ frame = new JFrame("ComboBox"); String Sports[]={"Select", "Tennis", "Cricket", "Football"}; JComboBox comboBox = new JComboBox(Sports); comboBox.setBounds(50, 50, 90, 20); frame.add(comboBox, BorderLayout.CENTER); JCheckBox toggleVisibility = new JCheckBox("Hide/Show"); toggleVisibility.setSelected(comboBox.isVisible()); toggleVisibility.addItemListener(e ...
Read MoreHandle JCheckBox Events with an ItemListener in Java
Here, we have used ItemListener to handle JCheckBox events i.e. whenever any of the CheckBox is selected.For example; When any of the sports like Football CheckBox is checked, event is fired and a message is visible in the botton.The following is an example to handle JCheckBox events with an ItemListener:Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingDemo(){ prepareGUI(); } public static void main(String[] args){ SwingDemo swingControlDemo = new SwingDemo(); ...
Read MoreHow to set Mnemonic key for selection of each JCheckBox in Java?
Mnemonic key is set so that a user can use Keyboard keys to check a CheckBox. For example, a key can be set with ALT:checkBox1.setMnemonic(KeyEvent.VK_F); checkBox2.setMnemonic(KeyEvent.VK_T); checkBox3.setMnemonic(KeyEvent.VK_R); checkBox4.setMnemonic(KeyEvent.VK_C); checkBox5.setMnemonic(KeyEvent.VK_A);Above, we have set key ALT+F for checkbox 1, key ALT+T for checkBox2, etc.The following is an example. Here, we have set Mnemonic key for selection of each CheckBox:Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingDemo(){ prepareGUI(); } public static void main(String[] args){ ...
Read MoreHow to set tooltip text for JCheckBox in Java?
For JCheckBox, use the following to set tooltip text:checkBox1.setToolTipText("Sports Football"); checkBox2.setToolTipText("Sports Tennis");Tooltip text is visible whenever you will place cursor on that particular text.The following is an example. Here, we have set the tooltip text for both the sports:Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingDemo(){ prepareGUI(); } public static void main(String[] args){ SwingDemo swingControlDemo = new SwingDemo(); swingControlDemo.showCheckBoxDemo(); } private void prepareGUI(){ ...
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