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How 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:
Example
import 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(){ mainFrame = new JFrame("Java Swing"); mainFrame.setSize(600,400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); headerLabel = new JLabel("", JLabel.CENTER); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showCheckBoxDemo(){ headerLabel.setText("Favourite Sports"); final JCheckBox checkBox1 = new JCheckBox("Football"); final JCheckBox checkBox2 = new JCheckBox("Tennis"); final JCheckBox checkBox3 = new JCheckBox("Rugby"); final JCheckBox checkBox4 = new JCheckBox("Cricket"); final JCheckBox checkBox5 = new JCheckBox("Racing"); 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); checkBox1.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Football Checkbox: "+ (e.getStateChange()==1?"checked":"unchecked")); } }); checkBox2.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Tennis Checkbox: "+ (e.getStateChange()==1?"checked":"unchecked")); } }); checkBox3.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Rugby Checkbox is "+ (e.getStateChange()==1?"checked":"unchecked")); } }); checkBox4.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Cricket Checkbox is "+ (e.getStateChange()==1?"checked":"unchecked")); } }); checkBox5.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Racing Checkbox is "+ (e.getStateChange()==1?"checked":"unchecked")); } }); controlPanel.add(checkBox1); controlPanel.add(checkBox2); controlPanel.add(checkBox3); controlPanel.add(checkBox4); controlPanel.add(checkBox5); mainFrame.setVisible(true); } }
Output
Now, Press and the key which is set for checkbox. Let’s say first for Football, we will press Alt+F, since the same we have set under the code (setMnemonic(KeyEvent.VK_F)):
Above, now the Football checkbox is checked since we used the key Alt+F
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