Swing KeyAdapter類

KeyAdapter類是一個抽象類（適配器）用於接收鍵盤事件。這個類的所有方法都是空的。這個類是方便類創建監聽器對象。

類聲明

以下是聲明 java.awt.event.KeyAdapter類：

public abstract class KeyAdapter extends Object implements KeyListener

類構造函數

S.N.

構造函數 & 描述

1

KeyAdapter()

類方法

S.N.

方法 & 描述

1

void keyPressed(KeyEvent e)
Invoked when a key has been pressed.

2

void keyReleased(KeyEvent e)
Invoked when a key has been released.

3

void keyTyped(KeyEvent e)
Invoked when a key has been typed.

方法繼承

這個類從以下類繼承的方法：

• java.lang.Object

KeyAdapter 例子

選擇使用任何編輯器創建以下java程序在 D:/ > SWING > com > yiibai > gui >

SwingAdapterDemo.java

package com.yiibai.gui; import java.awt.*; import java.awt.event.*; public class SwingAdapterDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingAdapterDemo(){ prepareGUI(); } public static void main(String[] args){ SwingAdapterDemo swingAdapterDemo = new SwingAdapterDemo(); swingAdapterDemo.showKeyAdapterDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java SWING Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); headerLabel = new JLabel("",JLabel.CENTER ); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showKeyAdapterDemo(){ headerLabel.setText("Listener in action: KeyAdapter"); final JTextField textField = new JTextField(10); textField.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e) { if(e.getKeyCode() == KeyEvent.VK_ENTER){ statusLabel.setText("Entered text: " + textField.getText()); } } }); JButton okButton = new JButton("OK"); okButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { statusLabel.setText("Entered text: " + textField.getText()); } }); controlPanel.add(textField); controlPanel.add(okButton); mainFrame.setVisible(true); } }

編譯程序，使用命令提示符。到 D:/ > SWING 然後輸出以下命令。

D:SWING>javac comyiibaiguiSwingAdapterDemo.java

如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。

D:SWING>java com.yiibai.gui.SwingAdapterDemo

驗證下面的輸出