打字母小游戏

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键盘的 code：左37，上38，右39，下40。顺时针排列。

同时KeyEvent类也给我们提供了上、下、左、右的常量：KeyEvent.VK_DOWN、KeyEvent.VK_RIGHT、KeyEvent.VK_UP、KeyEvent.VK_LEFT。

有了键盘的code，我们就可以实现一个简单的小游戏：打字母。

游戏框架，主函数类：

//Main.javapackage HitCharacter;import java.awt.*;public class Main {    public static void main(String[] args) {        Frame f = new Frame();        f.setSize(300, 400);        MyPanel mp = new MyPanel();        f.add(mp);        Thread t = new Thread(mp);        t.start();        f.addKeyListener(mp);        mp.addKeyListener(mp);        f.show();    }}

画板类，用于实现打字母的功能：

//MyPanel.javapackage HitCharacter;import java.awt.*;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;/*** Created by JiajieZhuo on 2017/4/2.*/public class MyPanel extends Panel implements Runnable, KeyListener {    private int[] x = new int[10];    private int[] y = new int[10];    private char[] c = new char[10];    private int score = 1000;    public MyPanel() {        for (int i = 0; i < 10; i++) {            x[i] = (int)(Math.random() * 300);            y[i] = (int)(Math.random() * 300);            c[i] = (char)(Math.random() * 26 + 97);        }    }    @Override    public void paint(Graphics g) {        for (int i = 0; i < 10; i++) {            g.drawString(new Character(c[i]).toString(), x[i], y[i]);        }        g.setColor(Color.RED);        g.drawString("Your score is " + score, 5, 15);    }    @Override    public void run() {        while (true) {            for (int i = 0; i < 10; i++) {                y[i]++;                if (y[i] > 400) {                    y[i] = 0;                    x[i] = (int)(Math.random() * 300);                    c[i] = (char)(Math.random() * 26 + 97);                    score -= 100;                }            }            try {                Thread.sleep(30);            } catch (InterruptedException e) {                e.printStackTrace();            }            repaint();        }    }    @Override    public void keyTyped(KeyEvent e) {    }    @Override    public void keyPressed(KeyEvent e) {        char keyC = e.getKeyChar();        int nowY = -1;        int nowIndex = -1;        for (int i = 0; i < 10; i++) {            if (keyC == c[i]) {                if (y[i] > nowY) {                    nowY = y[i];                    nowIndex = i;                }            }        }        if (nowIndex != -1) {            y[nowIndex] = 0;            x[nowIndex] = (int)(Math.random() * 300);            c[nowIndex] = (char)(Math.random() * 26 + 97);            score += 10;        } else {            score -= 100;        }    }    @Override    public void keyReleased(KeyEvent e) {    }}

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