freehandframe.java~5~

applet java 的编程程序

package chapter11;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;



public class FreeHandFrame extends JFrame
{
  JPanel infoPnl = new JPanel();
  JLabel totalLbl_1 = new JLabel("总数");
  JLabel totalLbl_2 = new JLabel();//计算总共下落的字母数标签
  JLabel rightLbl_1 = new JLabel("正确数");
  JLabel rightLbl_2 = new JLabel("");//计算正确击中的字母数标签
  JLabel errorLbl_1 = new JLabel("失败数");
  JLabel errorLbl_2 = new JLabel("");//计算未击中的字母数标签
  JLabel startLbl   = new JLabel("按F2开始");
  JLabel stopLbl    = new JLabel("按F3结束");

  Canvas canvas = new Canvas();//画板

  static int STEP_LEN  = 2  ;//每次下落的步长
  static int STEP_TIMEOUT      = 50;//每移动一个像素的间隔时间，以毫秒为单位
  static int DROP_THREAD_COUNT = 10;//下落字体线程数
  int colWidth;//每栏的宽度

  int totalCount = 0;
  int rightCount = 0;
  int errorCount = 0;

  char pressKeyChar ;//记录按下的按键
  boolean isStart = false;//是否开始游戏
  Stack dealThreadColStack = new Stack();//记录死亡线程所在的位置

  static String ALPHABET="abcdefghijklmnopqrstuvwxyz";//字母表
  Random random = new Random();//随机数

  public FreeHandFrame()
  {
      jinit();
      this.addKeyListener(new MyKeyListener());
  }

  /**
   * <b>功能说明：</b><br>
   * 为页面添加组件
   */
  private void jinit()
  {
    infoPnl.setBackground(Color.cyan);
    infoPnl.setLayout(new GridLayout(8,1));
    infoPnl.add(startLbl);
    infoPnl.add(stopLbl);
    infoPnl.add(totalLbl_1);
    infoPnl.add(totalLbl_2);
    infoPnl.add(rightLbl_1);
    infoPnl.add(rightLbl_2);
    infoPnl.add(errorLbl_1);
    infoPnl.add(errorLbl_2);
    getContentPane().add(infoPnl,BorderLayout.EAST);

    canvas.setBackground(Color.yellow);
    getContentPane().add(canvas,BorderLayout.CENTER);
  }

  /**
   * <b>功能说明：</b><br>
   * 返回一个随机字符
   * @return 随机字符
   */
  private char getRandomChar()
  {
     int temp = random.nextInt(26);
     return ALPHABET.charAt(temp);
  }
  /**
   * <b>功能说明：</b><br>
   * 将统计结果画到界面上
   */
  private void drawResult()
  {
     totalLbl_2.setText(""+totalCount);
     rightLbl_2.setText(""+rightCount);
     errorLbl_2.setText(""+errorCount);
  }
  public static void main(String[] args)
  {
     FreeHandFrame frm = new FreeHandFrame();
     frm.setSize(400,400);
     frm.show();
  }

  /**下落字体线程*/
  //////////////////////////////////////////////////////////////////////////////
  public class DropChar extends Thread
  {
    char c ;//对应的字线
    int colIndex;//在哪列下落

    int x,y;//行列的坐标
    public DropChar(char c,int colIndex)
    {
       this.c = c;
       this.colIndex = colIndex;
       this.x = (colIndex-1) * colWidth +colWidth/2;//所在的横坐标
    }
    public void run()
    {
        draw(1);
        while(c != pressKeyChar && y < 400 && isStart)
        {
          move();
          try
          {
            Thread.sleep(STEP_TIMEOUT);
          }
          catch (InterruptedException ex)
          {
             ex.printStackTrace();
          }
        }
        pressKeyChar = ' ';
        draw(2);
        if(isStart)
        {
           totalCount++;//统计总数
           if(y < 400) rightCount++;//打中
           else errorCount++;//打不中
        }
        drawResult();
        synchronized (canvas)
        {
          dealThreadColStack.push(new Integer(colIndex));//记录哪一列线程死亡
          canvas.notify();//通知总控线程创建一个新的下落线程
        }
    }

    /**向下移动一个像素*/
    private void move()
    {
      draw(2);
      y += STEP_LEN;
      draw(1);
    }
    /**
     * <b>功能说明：</b><br>
     * 画字母
     * @param actionType 1:画字母 2: 清除字母
     */
    private void draw(int actionType)
    {
       synchronized (canvas)//必须对资源canvas进行同步，否则会产生线程不安全
       {
          Graphics g = canvas.getGraphics();
          if(actionType == 2) g.setXORMode(canvas.getBackground());//清除
          g.setFont(new Font("Times New Roman",Font.PLAIN,12));
          g.drawString(""+c,x,y);
       }
    }
  }
  //////////////////////////////////////////////////////////////////////////////

  /**创建下落字体线程的主线程*/
  //////////////////////////////////////////////////////////////////////////////
  public class GenerateDropThread extends Thread
  {
    public void run()
    {
      for (int i = 0; i < DROP_THREAD_COUNT; i++) //产生下落线程
      {
        DropChar dropCharThread = new DropChar(getRandomChar(),i+1);
        dropCharThread.start();
        try
        {
          Thread.sleep(500);
        }
        catch (InterruptedException ex1) {
        }
      }
      while(isStart)
      {
          synchronized (canvas)
          {
              try
              {
                canvas.wait();
              }
              catch (InterruptedException ex) {
                ex.printStackTrace();
              }
          }
          while(!dealThreadColStack.empty())//在死亡线程的栏上产生新下落线程
          {
             int colInt = ((Integer)dealThreadColStack.pop()).intValue();
             DropChar dropCharThread = new DropChar(getRandomChar(),colInt);
             dropCharThread.start();
          }
      }
    }
  }
 //////////////////////////////////////////////////////////////////////////////

 /**响应键盘的监听器*/
 class MyKeyListener extends KeyAdapter
 {
    public void keyPressed(KeyEvent e)
    {
       if(e.getKeyCode() == KeyEvent.VK_F2)
       {
          isStart = true;//开始
          colWidth = canvas.getWidth()/ DROP_THREAD_COUNT;
          GenerateDropThread gdThread = new GenerateDropThread();//总控线程运行
          gdThread.start();
       }
       else if(e.getKeyCode() == KeyEvent.VK_F3)
       {
          isStart = false;//停止
       }
       else if(!e.isActionKey())
       {
          pressKeyChar = e.getKeyChar();
       }
    }
 }
}