Java

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//不好的例子，不要这么做：
class TetrisCanvas extends Canvas {
    int leftKey, rightKey, downKey, rotateKey;
    void init (){
        //FOLLOWING MUST NOT BE DONE
        leftKey = getKeyCode(LEFT);
        rightKey = getKeyCode(RIGHT);
        downKey = getKeyCode(DOWN);
        rotateKey = getKeyCode(FIRE);
    }

    public void keyPressed(int keyCode) {
        if (keyCode == leftKey) {
            moveBlockLeft();
        } else if (keyCode = rightKey) {
...
        }
    }
}

class TetrisCanvas extends Canvas {
    void init (){
    }
    public void keyPressed(int keyCode) {
        int action = getGameAction(keyCode);
        switch (action){
            case Canvas.LEFT:
                moveBlockLeft();
                break;
            case Canvas.RIGHT:
                moveBlockRight();
                break;
        }
}
}