为什么给增加了键盘监听器后，按上键盘都没反应

package gameFrame;

import gameServices.Services;
import gameTool.Prices;
import gameTool.Prices1;
import gameTool.Squares;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class GameFrame extends JFrame{

	public static final int GAMEPANEL_WIDTH = 400;
	public static final int GAMEPANEL_HEIGHT = 700;
	
	public static final int TOOLPANEL_WIDTH = 200;
	public static final int TOOLPANEL_HEIGHT = 700;
	
	private JPanel nextSquares ;
	private JLabel score;
	private JButton gameStart;
	private JButton gameStop;
	private JButton gameResume;
	
	//现在下落的大方块
	Prices currentPrices = null;

	//游戏窗口
	GamePanel gp;
	//工具窗口
	ToolPanel tp;
	
	public GameFrame(){

		gp = new GamePanel();
		tp = new ToolPanel();
		JSplitPane jsp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT ,gp,tp);	
		jsp.setDividerLocation(GAMEPANEL_WIDTH);
		this.add(jsp);
		
		System.out.println(this.getKeyListeners().length);  //打印0
		this.addKeyListener(new KeyBoardListener());
		System.out.println(this.getKeyListeners().length);  //打印1
	
		currentPrices = new Prices1();
		Timer timer = new Timer(1000,new PricesFallDowmListener());
		timer.start();
		
	}
	
	/*
	 * 监听器：游戏自动控制大方块下落 
	 */
	class PricesFallDowmListener implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			Services.fallDowm(currentPrices);
			gp.repaint();
		}
	}
	
	/*
	 * 键盘监听器
	 */
	class KeyBoardListener extends KeyAdapter{
		public void keyPressed(KeyEvent e){
			System.out.println("dfs");
			if(e.getKeyCode() == KeyEvent.VK_K){
				System.out.println("ldsfk");
			}
		}
		public void keyReleased(KeyEvent e){
			System.out.println("dfs");
		}
		public void keyTyped(KeyEvent e) {
			System.out.println("dfs");
		}
	}
	
	/*
	 * 游戏主窗口
	 */
	class GamePanel extends JPanel{
		public GamePanel(){
			this.setPreferredSize(new Dimension(GAMEPANEL_WIDTH,GAMEPANEL_HEIGHT));
			this.setBackground(Color.PINK);
		}
		public void paint(Graphics g){
			super.paint(g);
			if(currentPrices != null){
				java.util.List<Squares> list = currentPrices.getCurrentSquares();
				if(list == null)
					System.out.println("sdlf");
				for(int i = 0 ; i < list.size() ; i++){
					Squares squares  = list.get(i);
//					System.out.println(squares.getCurrentX() +":"+squares.getCurrentY());
					g.drawImage(squares.getImage(), squares.getCurrentX(), squares.getCurrentY(), 
							Squares.SQUARES_WIDTH, Squares.SQUARES_HIGHT, null);
			
				}
			}
		}
	}
	
	/*
	 * 工具窗口
	 * 用来显示  开始游戏，暂停游戏，继续游戏，下一个方块，分数 
	 */
	class ToolPanel extends JPanel{	
		public ToolPanel(){
			nextSquares = new JPanel();
			nextSquares.setPreferredSize(new Dimension(200,200));