import javax.swing.JFrame;
import java.awt.event.*;
//想测试每个键的keycode值,但是为什么报错呢?
class MyFrame extends JFrame{
MyFrame mf=null;
public MyFrame(){
mf=new MyFrame();
mf.setTitle("测试监听");
mf.addKeyListener(new KeyAdapter(){
public void KeyPressed(final KeyEvent e){
System.out.println(e.getKeyCode());
}
});
}
}
public class TestListener {
public static void main(String args[]){
new MyFrame();
}
}
我想实现当我按一个键的时候打印出他的keycode值。
但是运行要报错,请问怎么修改?
import java.awt.event.*;
//想测试每个键的keycode值,但是为什么报错呢?
class MyFrame extends JFrame{
MyFrame mf=null;
public MyFrame(){
mf=new MyFrame();
mf.setTitle("测试监听");
mf.addKeyListener(new KeyAdapter(){
public void KeyPressed(final KeyEvent e){
System.out.println(e.getKeyCode());
}
});
}
}
public class TestListener {
public static void main(String args[]){
new MyFrame();
}
}
我想实现当我按一个键的时候打印出他的keycode值。
但是运行要报错,请问怎么修改?
解决方案 »
- 请问这个正则表达式要怎么写?
- Textpad运行时找不到头文件
- 很细小的问题,但是有少人关注的问题
- 读入相同的文件,会占用更多的内存吗?
- 程序错误,请求支援~!!!
- Java中使用switch语句的话是否必须加break?
- 输入输出流的问题
- setVisible之后如何动态修改JFrame的大小?
- JB为何点用资源程序大,运行速度太慢,而borland系列产品象DELPHI,BCB都比它快。
- 这个numberOfObjects不是应该为3么?求解释
- struts中碰到的问题,急问!!
- 写一个函数,去掉一段html字符串中的标签,取得其中的纯文本。例:<<<<img src=’1.jsp’>test<bbb>test1</bbb>><<aaa>test2结果为<<<testte
import javax.swing.JFrame;
import java.awt.event.*;
//想测试没个键的keycode值,但是为什么报错呢?
class MyFrame extends JFrame{
//MyFrame mf=new MyFrame();
public MyFrame(){
//mf=new MyFrame();
this.setTitle("测试监听");
this.setSize(240, 320);
this.addKeyListener(new KeyAdapter(){
public void KeyPressed(final KeyEvent e){
System.out.println(e.getKeyCode());
}
});
this.setVisible(true);
}
}
public class TestListener {
public static void main(String args[]){
new MyFrame();
}
}
可是我想实现的功能还是没有实现,哪里还有问题?
new TestKeyListenerFrame().setVisible(true);
} public TestKeyListenerFrame() throws HeadlessException {
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setSize(200, 100);
this.setLocation(200, 200); this.addKeyListener(new KeyListener() {
public void keyTyped(KeyEvent e) {
displayInfo(e, "KEY TYPED: ");
} public void keyPressed(KeyEvent e) {
displayInfo(e, "KEY PRESSED: ");
} public void keyReleased(KeyEvent e) {
displayInfo(e, "KEY RELEASED: ");
}
});
} private void displayInfo(KeyEvent e, String keyStatus) { //You should only rely on the key char if the event
//is a key typed event.
int id = e.getID();
String keyString;
if (id == KeyEvent.KEY_TYPED) {
char c = e.getKeyChar();
keyString = "key character = '" + c + "'";
} else {
int keyCode = e.getKeyCode();
keyString = "key code = " + keyCode
+ " ("
+ KeyEvent.getKeyText(keyCode)
+ ")";
} int modifiersEx = e.getModifiersEx();
String modString = "extended modifiers = " + modifiersEx;
String tmpString = KeyEvent.getModifiersExText(modifiersEx);
if (tmpString.length() > 0) {
modString += " (" + tmpString + ")";
} else {
modString += " (no extended modifiers)";
} String actionString = "action key? ";
if (e.isActionKey()) {
actionString += "YES";
} else {
actionString += "NO";
} String locationString = "key location: ";
int location = e.getKeyLocation();
if (location == KeyEvent.KEY_LOCATION_STANDARD) {
locationString += "standard";
} else if (location == KeyEvent.KEY_LOCATION_LEFT) {
locationString += "left";
} else if (location == KeyEvent.KEY_LOCATION_RIGHT) {
locationString += "right";
} else if (location == KeyEvent.KEY_LOCATION_NUMPAD) {
locationString += "numpad";
} else { // (location == KeyEvent.KEY_LOCATION_UNKNOWN)
locationString += "unknown";
} System.out.println("------- " + keyStatus + " -------\n" +
keyString + "\n" +
modString + "\n" +
actionString + "\n" +
locationString);
}
}