首页 > 代码库 > JavaSE 键盘事件类(KeyEvent)实现

JavaSE 键盘事件类(KeyEvent)实现

{相关信息}
键盘事件类(KeyEvent)是容器内的任意组件获得焦点时,组件发生键击事件,当按下释放或键入某一个键时,组件对象将产生该事件。使用键盘事件必须给组件添加一个KeyListener 接口的事件处理器,该接口包含以下 3 个方法:
void keyPressed(KeyEvent e):按下按键时发生。
void keyReleased(KeyEvent e):松开按键时发生。
void keyTyped(KeyEvent e):敲击键盘,发生在按键按下后,按键放开前。

{效果图}

技术分享

 

{实现代码}

package sup.orange.learn;import java.awt.*;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;/** * Created by re-x on 10/31/14. */public class KeyEventDemo extends Frame implements KeyListener {    TextArea textarea, textarea1;    Button button;    public KeyEventDemo () {        super();        init();    }    public static void main(String[] args) {        new KeyEventDemo();    }    public void init() {        setLayout(new GridLayout(3, 1));        textarea = new TextArea();        textarea1 = new TextArea();        add(textarea);        button = new Button("click me first, then click any other key");        add(button);        button.addKeyListener(this);        add(textarea1);        addWindowListener(new WindowAdapter() {            @Override            public void windowClosing(WindowEvent e) {                super.windowClosing(e);                dispose();                System.exit(0);            }        });        setSize(200, 300);        setVisible(true);    }    public void keyPressed(KeyEvent e) {        textarea.setText("key pressed");    }    public void keyReleased(KeyEvent e) {        textarea.setText("key released");    }    public void keyTyped(KeyEvent e) {        textarea1.setText(String.valueOf(e.getKeyChar()));    }}

 

JavaSE 键盘事件类(KeyEvent)实现