我下面写的代码,按字母总是没反应,好像我写的很混乱,谢谢大家帮我找找问题吧!
/**
* @(#)KeyboardEvent.java
*
*
* @author
* @version 1.00 2009/12/14
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class KeyboardEvent extends JApplet implements KeyListener{
private String indicator="please input a char:";
private char charInput='a';
private int x=0;
private int y=0; public KeyboardEvent() {
}
public void init(){
//getGraphics().drawString(indicator,10,10);
addKeyListener(this);
focus();
}
public void start(){
}
public void focus(){
this.requestFocus();
}
public void keyPressed(KeyEvent e){
}
public void keyReleased(KeyEvent e){
}
public void keyTyped(KeyEvent e){
charInput=e.getKeyChar();
repaint();
}
public void paint(Graphics g){
g.drawString("TRY THIS",150,150);
g.drawString(String.valueOf(charInput),x,y);
}
public static void main(String[] args){
KeyboardEvent kbEvent=new KeyboardEvent();
JFrame frame=new JFrame();
frame.getContentPane().add(kbEvent,BorderLayout.CENTER);
kbEvent.init();
kbEvent.start();
kbEvent.focus();
frame.setSize(400,400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
* @(#)KeyboardEvent.java
*
*
* @author
* @version 1.00 2009/12/14
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class KeyboardEvent extends JApplet implements KeyListener{
private String indicator="please input a char:";
private char charInput='a';
private int x=0;
private int y=0; public KeyboardEvent() {
}
public void init(){
//getGraphics().drawString(indicator,10,10);
addKeyListener(this);
focus();
}
public void start(){
}
public void focus(){
this.requestFocus();
}
public void keyPressed(KeyEvent e){
}
public void keyReleased(KeyEvent e){
}
public void keyTyped(KeyEvent e){
charInput=e.getKeyChar();
repaint();
}
public void paint(Graphics g){
g.drawString("TRY THIS",150,150);
g.drawString(String.valueOf(charInput),x,y);
}
public static void main(String[] args){
KeyboardEvent kbEvent=new KeyboardEvent();
JFrame frame=new JFrame();
frame.getContentPane().add(kbEvent,BorderLayout.CENTER);
kbEvent.init();
kbEvent.start();
kbEvent.focus();
frame.setSize(400,400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
* @(#)KeyboardEvent.java
*
*
* @author
* @version 1.00 2009/12/14
*/
import java.awt.*;
import java.awt.event.*;
import java.util.Random;import javax.swing.*; public class KeyboardEvent extends JApplet implements KeyListener{ private String indicator="please input a char:";
private char charInput='a';
private int x=10;
private int y=10; public KeyboardEvent() {
}
public void init(){
//getGraphics().drawString(indicator,10,10);
addKeyListener(this);
focus();
}
public void start(){
}
public void focus(){
this.requestFocus();
}
public void keyPressed(KeyEvent e){
}
public void keyReleased(KeyEvent e){
}
public void keyTyped(KeyEvent e){
System.out.println(e.getKeyChar());
charInput=e.getKeyChar();
repaint();
}
public void paint(Graphics g){
g.drawString("TRY THIS",150,150);
g.drawString(String.valueOf(charInput),new Random().nextInt(150),new Random().nextInt(150));
}
public static void main(String[] args){
KeyboardEvent kbEvent=new KeyboardEvent();
JFrame frame=new JFrame();
frame.getContentPane().add(kbEvent,BorderLayout.CENTER);
kbEvent.init();
kbEvent.start();
kbEvent.focus();
frame.setSize(400,400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}感觉下吧 这种问题 应该自己可以debug出来
* @(#)KeyboardEvent.java
*
*
* @author
* @version 1.00 2009/12/14
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*; public class KeyboardEvent extends JApplet implements KeyListener{ private String indicator="please input a char:";
private char charInput='a';
private int x=100;
private int y=100;
public KeyboardEvent()
{
JFrame frame=new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,400);
this.addKeyListener(this);
frame.setVisible(true);
}
public void keyPressed(KeyEvent e)
{
charInput=e.getKeyChar();
repaint();
}
public void keyReleased(KeyEvent e)
{}
public void keyTyped(KeyEvent e)
{}
public void paint(Graphics g)
{
g.setColor(this.getBackground());
g.fillRect(0,0,this.getWidth(),this.getHeight());
g.setColor(Color.RED);
g.drawString(indicator,10,10);
g.drawString("TRY THIS",150,150);
g.drawString(String.valueOf(charInput),x,y);
}
public static void main(String[] args)
{
new KeyboardEvent();
}
}
给你改了,你看是这样不。