java编译时出现Window不是抽象的，如何解决

java编译时出现Window不是抽象的，怎么解决？
//java程序如下

public class Example15_8{
public static void main(String args[]){
WindowWord win=new WindowWord();
win.setTitle("带滚动字幕的小词典");
}}

//
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class WindowWord extends JFrame implements ActionListener,Runnable{
JTextField inputText,showText;
JLabel lable=new JLabel("欢迎使用本字典");
JButton fast=new JButton("加速滚动");
Thread scrollWord=null;
Police police;
WindowWord(){
setLayout(new FlowLayout());
scrollWord=new Thread(this);
inputText=new JTextField(6);
showText=new JTextField(6);
lable.setFont(new Font("楷体_GB2312",Font.BOLD,24));
add(inputText);
add(showText);
add(fast);
add(lable);
police=new Police();
police.setJTextField(showText);
inputText.addActionListener(police);
fast.addActionListener(this);
setBounds(100,100,400,280);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
scrollWord.start();
}
public void run(){
while(true){
int x=lable.getBounds().x;
int y=50;
x=x+5;
lable.setLocation(x,y);
if(x>380){
x=10;
lable.setLocation(x,y);
try{Thread.sleep(200);}
catch(InterruptedException e){}
String str=inputText.getText();
if(str.equals("end"))
{return;}
}}}
public void actionperformed(ActionEvent e)
{scrollWord.interrupt();}}
//
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
public class Police implements ActionListener{
JTextField showText;
HashMap<String,String>hashtable;
File file=new File("word.txt");
Scanner sc=null;
Police(){
hashtable=new HashMap<String,String>();
try{sc=new Scanner(file);
while(sc.hasNext()){
String englishWord=sc.next();
String chineseWord=sc.next();
hashtable.put(englishWord,chineseWord);
}
}
catch(Exception e){}
}
public void setJTextField(JTextField showText){
this.showText=showText;}
public void actionPerformed(ActionEvent e){
String englishWord=e.getActionCommand();
if(hashtable.containsKey(englishWord))
{String chineseWord=hashtable.get(englishWord);
showText.setText(chineseWord);
}
else{showText.setText("没有此单词");}
}}

------解决方案--------------------
我标注 红的了！！！！！！