Question

我正在制作一款能产生三角星（3PS）和四角星（4PS）的游戏。您必须使3PS向右下降，向左移动4PS。我使用if语句来检查它们是否已经落入正确的路线但是它无法正常工作。我为3PS创建了一个星级，并且为4PS类创建了一个类4PS。我有一个变量，每当一颗星落在屏幕下方时增量，3PS似乎没问题，但4PS增加了4PS和3PS的变量。我该如何解决这个问题？

这是我的代码

           if (0 <= starW && starW <= (.5 * dimension[0]) && starH <= 0) {
                    if (star[a] instanceof fourStar) {
                        if (count4Check == false) {
                        count4C++;
                        count4Check = true;
                        starAdded = 0;
                        Log.i("count4C", String.valueOf(count4C));
                   }count4Check = false;
                }
            }
            if (0 <= starW && starW <= (.5 * dimension[0]) && starH <= 0) {
                    if (star[a] instanceof Star) {
                        if (count3Check == false) {
                        count3W++;
                        count3Check = true;
                        starAdded = 0;
                        Log.i("count3W", String.valueOf(count3W));
                   }count3Check = false;
                }
            }
            if ((.5 * dimension[0]) <= starW && starW <= dimension[0] && starH <= 0) {
                    if (star[a] instanceof Star) {
                        if (count3Check == false) {
                        count3C++;
                        count3Check = true;
                        starAdded = 0;
                        Log.i("count3C", String.valueOf(count3C));
                    }count3Check = false;
                }
            }
            if ((.5 * dimension[0]) <= starW && starW <= dimension[0] && starH <= 0) {
                    if (star[a] instanceof fourStar) {
                        if (count4Check == false) {
                        count4W++;
                        count4Check = true;
                        starAdded = 0;
                        Log.i("count4W", String.valueOf(count4W));
                    }count4Check = false;
                }
            }

这是logcat

03-21 20:06:36.620  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 3 star added
03-21 20:06:39.623  24716-25725/com.example.james.sata I/count3C﹕ 9
03-21 20:06:39.713  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 4 star added
03-21 20:06:42.276  24716-25725/com.example.james.sata I/count4C﹕ 2
03-21 20:06:42.276  24716-25725/com.example.james.sata I/count3W﹕ 5
03-21 20:06:42.356  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 3 star added
03-21 20:06:45.149  24716-25725/com.example.james.sata I/count3W﹕ 6
03-21 20:06:45.239  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 4 star added
03-21 20:06:48.592  24716-25725/com.example.james.sata I/count4C﹕ 3
03-21 20:06:48.592  24716-25725/com.example.james.sata I/count3W﹕ 7
03-21 20:06:48.692  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 4 star added
03-21 20:06:51.726  24716-25725/com.example.james.sata I/count4C﹕ 4
03-21 20:06:51.726  24716-25725/com.example.james.sata I/count3W﹕ 8
03-21 20:06:51.776  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 3 star added
03-21 20:06:54.779  24716-25725/com.example.james.sata I/count3C﹕ 10
03-21 20:06:54.859  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 3 star added
03-21 20:07:10.446  24716-25725/com.example.james.sata I/count3C﹕ 11
03-21 20:07:10.526  24716-25725/com.example.james.sata I/MyGLRenderer﹕ 4 star added
03-21 20:07:25.772  24716-25725/com.example.james.sata I/count3C﹕ 12
03-21 20:07:25.772  24716-25725/com.example.james.sata I/count4W﹕ 3

Answer 1

四星是星的子类，所以如果

也会传递它

if (star[a] instanceof Star) {

例如，您可以拥有代码：

boolnea isOnLeft = starW <= (.5 * dimension[0]);
boolean isOut = starH <= 0;

if (star[a] instanceof fourStar) {
  if (isOnLeft && isOut) {
  ...
  }
} else { //3ps
  if (!isOnLeft && isOut) {
  ...
  }
}

然而，如果你检查实际课程，它不是很好。你应该有Star class，有两个subpcasses 3PS和4PS。然后在星级类中定义抽象方法boolean shouldCount(position)，在3PS中你实现了shouldCount（），如果位置在右侧和屏幕之外，则返回true，以4PS反过来。然后，您只需致电shouldCount并提高分数。

if语句产生不正确的结果

1 个答案: