Java setMnemonic() 并通过按键调用方法
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setMnemonic() and call a method by pressing the key
提问by Yithirash
I have to run a method() manually when pressing the key (Alt+H).
按下键 (Alt+H) 时，我必须手动运行 method()。
if("The key pressed==(Alt+H)"){
callMethod();
}
public void callMethod(){
//Some codes here
}
How I can actually do this in Java. Please give me a simple way to do this.
我如何在 Java 中真正做到这一点。请给我一个简单的方法来做到这一点。
采纳答案by Braj
It's worth reading here about Oracle Tutorial - Enabling Keyboard Operationwhere it is explained in details along with sample.
值得在此处阅读有关Oracle 教程 - 启用键盘操作的内容，其中详细解释了该教程并附有示例。
Read more about on Oracle Tutorial - How to Use Key Bindings
Some example directly from the above tutorial:
直接来自上述教程的一些示例：
//Setting the mnemonic when constructing a menu item:
menuItem = new JMenuItem("A text-only menu item",
KeyEvent.VK_H);
//Setting the mnemonic after creation time:
menuItem.setMnemonic(KeyEvent.VK_H);
//Setting the accelerator:
menuItem.setAccelerator(KeyStroke.getKeyStroke(
KeyEvent.VK_H, ActionEvent.ALT_MASK));
Read more here Oracle Tutorial - How to Use Buttons, Check Boxes, and Radio Buttons
在此处阅读更多内容Oracle 教程 - 如何使用按钮、复选框和单选按钮
Sample code: (Alt-Hwould click the Middle button)
示例代码：（Alt-H将单击中间按钮）
JButton b2 = new JButton("Middle button", middleButtonIcon);
b2.setMnemonic(KeyEvent.VK_H);
回答by tenorsax
If using menus then you can use setMnemonic(), see How to Use Menusfor examples. Another option is to use Key Bindings. For example:
如果使用菜单，则可以使用setMnemonic()，请参阅如何使用菜单以获取示例。另一种选择是使用Key Bindings。例如：
import java.awt.event.*;
import javax.swing.*;
public class TestKeys {
private static void createAndShowGUI() {
final JFrame frame = new JFrame("Keys");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
KeyStroke escapeKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_H, InputEvent.ALT_MASK);
Action testAction = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(frame, "Alt-H pressed");
}
};
frame.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(escapeKeyStroke, "TestAction");
frame.getRootPane().getActionMap().put("TestAction", testAction);
JLabel label = new JLabel("Hit Alt-H");
label.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
frame.add(label);
frame.setLocationByPlatform(true);
frame.pack();
frame.setVisible(true);
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
回答by CodeSession
Best method is to use setMnemonic() because its the the simplest.
最好的方法是使用 setMnemonic() 因为它是最简单的。
check this article for more http://www.herongyang.com/Swing/JMenuBar-Set-Keyboard-Mnemonics-on-Menu-Items.html
查看这篇文章了解更多http://www.herongyang.com/Swing/JMenuBar-Set-Keyboard-Mnemonics-on-Menu-Items.html
private JMenu getColorMenu() {
JMenu myMenu = new JMenu("Color");
ButtonGroup myGroup = new ButtonGroup();
JRadioButtonMenuItem myItem = new JRadioButtonMenuItem("Red");
myItem.setSelected(true);
myItem.setMnemonic(KeyEvent.VK_R);
myItem.addActionListener(this);
myItem.addMenuKeyListener(this);
myGroup.add(myItem);
myMenu.add(myItem);
myItem = new JRadioButtonMenuItem("Green");
myItem.setMnemonic(KeyEvent.VK_G);
myItem.addActionListener(this);
myItem.addMenuKeyListener(this);
myGroup.add(myItem);
myMenu.add(myItem);
myItem = new JRadioButtonMenuItem("Blue");
myItem.setMnemonic(KeyEvent.VK_B);
myItem.addActionListener(this);
myItem.addMenuKeyListener(this);
myGroup.add(myItem);
myMenu.add(myItem);
return myMenu;
