java打字游戏如何添加暂停

Question

各位大佬下面这代码添加实现按下空格暂停，再按下一次继续

public class TypeFrame extends Frame {

public long start,end;//游戏开始与刷新时的时间，用于统计打字速度
public int typecount=0;//打字个数
public Image paintplace = null;  //绘制其他图形的底图
public static final int GAME_HEIGHT = 666;// 游戏高度
public static final int GAME_WIDTH = 956; // 游戏宽度
public ArrayList<Emery> apples = new ArrayList<>();  //放置所有存活的苹果的容器
public static int score = 0;    //分数
public Image bg = Toolkit.getDefaultToolkit().getImage("bg.jpg");//背景图片

TypeFrame tf=this;  //得到当前对象以便后面使用

public TypeFrame() {
    setTitle("拯救苹果");
    start=System.currentTimeMillis();  //获取系统当前的毫秒
    setVisible(true);
    setBounds(200, 20, GAME_WIDTH, GAME_HEIGHT);//设置界面

    addWindowListener(new WindowAdapter() {  //设置关闭监听
        public void windowClosing(WindowEvent e) {
            dispose();
        }
    });

    addKeyListener(new KeyAdapter() {
        public void keyReleased(KeyEvent e) {

            for (int i = 0; i < apples.size(); ) {
                if (e.getKeyChar() == apples.get(i).c) {//如果与输入的字母一致，则移除苹果并加10分
                    apples.get(i).alive = false;
                    apples.remove(i);
                    score+=10;
                    typecount++;
                    apples.add(new Emery(tf));
                }
                i++;
            }
        }
    });

    for (int i = 0; i < 10; i++) {
        apples.add(new Emery(this));
    }
    new Thread(new PaintThread()).start();
}

public void update(Graphics g) {
    if (paintplace == null) {
        paintplace = createImage(GAME_WIDTH, GAME_HEIGHT);
    }
    Graphics gback = paintplace.getGraphics(); // 得到背景图片画笔
    Color c = gback.getColor();
    gback.setColor(Color.gray);
    gback.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
    gback.setColor(c);

    gback.drawImage(bg, 0, 0, null);  //绘制背景图片
    gback.setColor(Color.black);
    gback.setFont(new Font("Dialog", 5, 25));
    gback.drawString("Score:"+score, 30, 70);//绘制分数
    end=System.currentTimeMillis();   //获取系统此刻的毫秒数
    gback.drawString("打字速度:"+(typecount*60000/(end-start))+"字/分", 30, 100);
    paint(gback);

    g.drawImage(paintplace, 0, 0, null);    //绘制画板

}

public void paint(Graphics g) {
    for (int i = 0; i < apples.size(); ) {
        if(apples.get(i).y<=GAME_HEIGHT+20){   //如果苹果还在界内，则正常绘制
        apples.get(i).draw(g);
        i++;
        }
        else{       //否则移除出容器，扣5分，并且加入新的苹果
            apples.get(i).alive = false;
            apples.remove(i);
            score-=5;
            apples.add(new Emery(tf));
        }
    }

}

class PaintThread implements Runnable {

    @Override
    public void run() {
        Emery emery = null;
        while (true) {           //控制苹果坐标改变
            for (int i = 0; i < apples.size(); i++) {
                emery = apples.get(i);
                emery.y += emery.YSPEED;
                if (emery.turnleft) {
                    emery.x -= emery.XSPEED;
                    if (Math.abs((emery.center - emery.x)) > 20) {
                        emery.turnleft = false;
                    }
                } else {
                    emery.x += emery.XSPEED;
                    if (Math.abs((emery.center - emery.x)) > 20) {
                        emery.turnleft = true;
                    }
                }
            }
            repaint();   //重绘整个界面
            try {
                Thread.sleep(40);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}

public static void main(String[] args) {
    TypeFrame tf = new TypeFrame();
}

}
苹果类

public class Emery {
public char c; //苹果上的字母
public int x = 60, y = 0; // 敌人出现的坐标
public final int XSPEED=5,YSPEED=2; //苹果xy方向移动的速度
public int center; //初始中心值
public boolean turnleft = true; //是否向左移动
public boolean alive = true; //是否活着
public Random ran = new Random(); //随机数的种子

public TypeFrame tf=null;    //所属的框架
public Image appleimg = null;   //苹果的图片
public Image bg = Toolkit.getDefaultToolkit().getImage("bg.jpg"); //背景图片

public Emery(TypeFrame tf) {
    this.tf=tf;
    x = randomlocation();  //得到随机合格的随机x坐标
    y=ran.nextInt(20);  //得到随机的y坐标
    if(ran.nextInt(2)==0){
        turnleft=true;
    }else
    {
        turnleft=false;
    }
    center = x;   //设置初始中心值为x
    c=randomchar();  //得到随机的字母值
    try {
        appleimg = ImageIO.read(new File("apple.gif"));  //苹果的图片
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

public void draw(Graphics g) {
    Color color = g.getColor();  //得到上下文颜色
    g.setColor(Color.red);   //设置上下文颜色
    g.setFont(new Font("Dialog", 4, 40));   //设置字体


    if (alive) {
        g.drawImage(appleimg, x, y, null);    //绘制苹果图片
        g.drawString(c+ "", x + 20, y + 60);   //绘制苹果字母
    }
    g.setColor(color);  //将上下文颜色设置回去
}

public int randomlocation(){  //产生苹果的随机横坐标的函数
    int x1=ran.nextInt(TypeFrame.GAME_WIDTH - 40);
    for (int i = 0; i < tf.apples.size(); i++) {
        if(Math.abs(x1-tf.apples.get(i).x)<60){
            return randomlocation();
        }
    }
    return x1;
}

public char randomchar(){   //产生不与存在的苹果字母相同的字母的方法
    char ch=(char)('a'+ran.nextInt(26));
    for (int i = 0; i < tf.apples.size(); i++) {
        if(ch==tf.apples.get(i).c)
            return randomchar();
    }
    return ch;
}

}

Answer 1

使用线程控制暂停和开始。。