Krantik Chavan has Published 345 Answers

What happens when JDialog is set with Modality type APPLICATION_MODAL

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 08:38:55
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) ... Read More

How to pre-select JComboBox item by index in Java?

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 08:33:08
The following is an example to pre-select JComboBox item by index in Java. Here, we have selected the 3rd item by default i.e. whenever the Swing program will run, the third item would be visible instead of the 1st.Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; ... Read More

How to display the items in a JComboBox in Java

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 08:28:24
The following is an example to display the first element in a JComboBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextArea; public class SwingDemo {    public static void main(String[] args) {       JPanel panel = new JPanel(new BorderLayout()); ... Read More

How to hide and display JCombobox with a JCheckBox in Java?

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 08:20:07
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(){   ... Read More

Java Program to disable the first item on a JComboBox

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 08:15:30
To disable the first index, on the click of a button, let us implement for index > 0 i.e. item 2:System.out.println("Index 0 (First Item) is disabled... "); comboBox.addItemListener(e -> {    if (comboBox.getSelectedIndex() > 0) {       System.out.println("Index = " + comboBox.getSelectedIndex());    } });By implementing above, we ... Read More

How to align JLabel text vertically top in Java?

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 08:03:07
Use the setVerticalAlignment() method to align JLabel text vertically to the top:JLabel label = label.setVerticalAlignment(JLabel.TOP);The following is an example to align JLabel text vertically to the top: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 ... Read More

How to set Mnemonic key for selection of each JCheckBox in Java?

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 07:57:35
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 ... Read More

Handle JCheckBox Events with an ItemListener in Java

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 07:42:47
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 ... Read More

How to get or set the selection state of JCheckBox in Java

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 07:37:31
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 ... Read More

How to disable JCheckBox if not checked in Java

Krantik Chavan
Krantik Chavan
Published on 06-May-2019 07:33:21
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() {         ... Read More
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