我把接口里的方法都实现了,为什么还出现这样的错误
haiye 2007-05-16 11:59:37 程序出现错误如下:
H:\Java_Test>javac MyCanvas.java
MyCanvas.java:5: MyCanvas is not abstract and does not override abstract method
keyTyped(java.awt.event.KeyEvent) in java.awt.event.KeyListener
public class MyCanvas implements KeyListener,MouseListener{
^
1 error
源程序如下:
//绘图
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class MyCanvas implements KeyListener,MouseListener{
Canvas c;
String s = "";
public static void main(String args[]){
Frame f = new Frame("Canvas");
MyCanvas mc = new MyCanvas();
mc.c = new Canvas();
f.add("Center",mc.c);
f.setSize(150,150);
mc.c.addMouseListener(mc);
mc.c.addKeyListener(mc);
f.setVisible(true);
}
public void mouseClicked(MouseEvent ev){
System.out.println("MouseClicked");
c.requestFocus();
}
public void KeyTyped(KeyEvent ev){
System.out.println("KeyTyped");
s+=ev.getKeyChar();
c.getGraphics().drawString(s,0,20);
}
public void keyPressed(KeyEvent ev){System.out.println("KeyPressed");}
public void keyReleased(KeyEvent ev){System.out.println("keyReleased");}
public void mousePressed(MouseEvent ev){System.out.println("mousePressed");}
public void mouseReleased(MouseEvent ev){System.out.println("mouseReleased");}
public void mouseEntered(MouseEvent ev){System.out.println("mouseEntered");}
public void mouseExited(MouseEvent ev){System.out.println("mouseExited");}
}
我已经把接口KeyListener,MouseListener里的方法全部实现了,为什么还是出现这样的错误?