关于抽象类的问题！

[mummy188]

我用JCREACTOR编译这两个程序时，她都说“类不是抽象的，和方法不能被重写”！请师兄师姐帮我看看，错在哪？在线等待你的回答！！先谢谢大家了！
程序1：
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class MyCanvas
implements KeyListener,MouseListener{
Canvas c;
String s="";
TextField t;

public static void main(String args[]){
Frame f=new Frame("Canvas");
MyCanvas mc=new MyCanvas();
mc.c=new Canvas();
mc.t=new TextField();
f.add("South",mc.t);
f.setSize(500,300);
mc.c.addMouseListener(mc);
mc.c.addKeyListener(mc);
f.setVisible(true);
}
//实现KeyListener接口中的方法

public void KeyTyped(KeyEvent ev){
t.setText("keyTyped");
s+=ev.getKeyChar();

//将用户键入的字符写到画布上
c.getGraphics().drawString(s,0,20);
}

public void keyPressed(KeyEvent ev){}

public void keyReleased(KeyEvent ev){
t.setText("keyReleased");
}

//实现MouseListener接口中的方法
public void mouseClicked(MouseEvent ev){
t.setText("mouseClicked");
//强制画布获取输入焦点
c.requestFocus();
}

public void mousePressed(MouseEvent ev){
t.setText("mousePressed");
}

public void mouseReleased(MouseEvent ev){
t.setText("mouseReleased");
}

public void mouseEntered(MouseEvent ev){
t.setText("mouseEntered");
}

public void mouseExited(MouseEvent ev){
t.setText("mouseExited");
}
}




程序2：
import java.awt.*;
import java.awt.event.*;

public class TextExample
implements ActionListener,TextListener{
Frame f;
TextField tf1;
TextArea ta1,ta2;

static public void main(String args[]){
TextExample te=new TextExample();
te.go();
}

public void go(){
f=new Frame("Text Example");
f.setLayout(new FlowLayout());

tf1=new TextField("Init",20);
tf1.addActionListener(this);
tf1.addTextListener(this);

ta1=new TextArea("Inital text",4,30);
ta1.addTextListener(this);
ta2=new TextArea("Only horizontal scrollbar",4,30,
TextArea.SCROLLBARS_HORIZONTAL_ONLY);

f.add(tf1);
f.add(ta1);
f.add(ta2);
f.setSize(300,300);
f.setVisible(true);
}

public void actionPerformed(ActionEvent e){
ta2.append("\nActionPerformed");
}

public void textValuChanged(TextEvent e){
ta2.append("\nTextValueChanged");
}
}