java - 计数器 : Counting Between 1 and 300

Question

我有一个计数器，我想在 1 到 300 之间计数。我使用从另一个类中的计数器获得的最终变量，然后分解该数字并在屏幕上显示正确的数字(以三张图片——个位、十位、百位)。但是，我真的很难让它正确计数。每次用户点击某个区域时，我希望计数器相应地更新。这是我正在使用的两个类:

    public class Counter {

int count = 0;

public int IncreaseOnes() {

    if (count >= 0 && count < 300){
        count = count++;
        }   
    else {
        count = 0;
    }
        return count;
}

public int DecreaseOnes() {

    if (count >= 0 && count < 300){
        count = count--;
        }   
    else {
        count = 0;
    }
        return count;
}

public int IncreaseTens() {

if (count >= 0 && count < 300){
    count = count + 10;
    }   
else {
    count = 0;
}
    return count;
 }
 public int DecreaseTens() {

    if (count >= 0 && count < 300){
        count = count - 10;
        }   
    else {
        count = 0;
    }
        return count;
}

public int IncreaseHundreds() {

    if (count >= 0 && count < 300){
        count = count + 100;
        }   
    else {
        count = 0;
    }
        return count;
}

public int DecreaseHundreds() {

    if (count >= 0 && count < 300){
        count = count - 100;
        }   
    else {
        count = 0;
    }
        return count;
}

public int getFinalCount() {
    System.out.println(count);
    return count;       
}

}  

然后

public class TempoScreen extends Screen {
public TempoScreen(Game game) {
    super(game);
}

Counter counter = new Counter();
private final int number_y = 240;
private final int number_hundreds_x = 75;
private final int number_tens_x = 195;
private final int number_ones_x = 308;

@Override
public void update(float deltaTime) {

    List<TouchEvent> touchEvents = game.getInput().getTouchEvents();

    int len = touchEvents.size();
    for (int i = 0; i < len; i++) {
        TouchEvent event = touchEvents.get(i);
        if (event.type == TouchEvent.TOUCH_UP) {

            if (inBounds(event, 75,138,145,205)) {
                //Increase Tempo
                //Upper Button Left
                counter.IncreaseHundreds();

                } 
            } if (inBounds (event, 201,141,269,205)) {
                //Increase Tempo
                //Upper Button Middle
                counter.IncreaseTens();

            } if (inBounds (event, 318,143,385,203)) {
                //Increase Tempo
                //Upper Button Right
                counter.IncreaseOnes();

            } if (inBounds (event, 75,435,142,498)) {
                //Decrease Tempo
                //Lower Button Left
                counter.DecreaseHundreds();

            } if (inBounds (event, 199,437,268,499)) {
                //Decrease Tempo
                //Lower Button Middle
                counter.DecreaseTens();

            } if (inBounds (event, 319,435,382,497)) {
                //Decrease Tempo
                //Lower Button Right
                counter.DecreaseOnes();

            } if (inBounds(event, 4,662,143,794)) {
                //GO BACK TO MAINMENU
                game.setScreen(new MainMenuScreen (game));
                // TO SAVE WHICH ONE IT USE USE FILE IO CLASSES
            } if (inBounds (event, 341,665,477,794)) {
                //GO TO GAME
                game.setScreen(new GameScreen (game));

            }


        } 
    }


private boolean inBounds(TouchEvent event, int x, int y, int width,
                         int height) {
    if (event.x > x && event.x < x + width - 1 && event.y > y
            && event.y < y + height - 1)
        return true;
    else
        return false;
}


@Override
public void paint(float deltaTime) {
    Graphics g = game.getGraphics();
    int finalCount = counter.getFinalCount();

    g.drawImage(Assets.tempo, 0, 0);
    g.drawImage(Assets.zero, number_hundreds_x, number_y); //draw 0 hundreds
    g.drawImage(Assets.zero, number_tens_x, number_y); //draw 0 tens
    g.drawImage(Assets.zero, number_ones_x, number_y); //draw 0 ones

    int ones = finalCount % 10;
    int tens = finalCount / 10 % 10;
    int hundreds = finalCount / 100 % 10;

    if (ones == 2) {
        g.drawImage(Assets.two, number_ones_x, number_y);
    } 

    if (ones == 3) {
        g.drawImage(Assets.three, number_ones_x, number_y);
    } 

    if (ones == 4) {
        g.drawImage(Assets.four, number_ones_x, number_y);
    } 

    if (ones == 5) {
        g.drawImage(Assets.five, number_ones_x, number_y);
    }

    if (ones == 6) {
        g.drawImage(Assets.six, number_ones_x, number_y);
    } 

    if (ones == 7) {
        g.drawImage(Assets.seven, number_ones_x, number_y);
    } 

    if (ones == 8) {
        g.drawImage(Assets.eight, number_ones_x, number_y);
    } 

    if (ones == 9) {
        g.drawImage(Assets.nine, number_ones_x, number_y); 
    }

    if (tens == 1 && ones == 0) {
        g.drawImage(Assets.one, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 2 && ones == 0) {
        g.drawImage(Assets.two, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 3 && ones == 0) {
        g.drawImage(Assets.three, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 4 && ones == 0) {
        g.drawImage(Assets.four, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 5 && ones == 0) {
        g.drawImage(Assets.five, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 6 && ones == 0) {
        g.drawImage(Assets.six, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 7 && ones == 0) {
        g.drawImage(Assets.seven, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 8 && ones == 0) {
        g.drawImage(Assets.eight, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 9 && ones == 0) {
        g.drawImage(Assets.nine, number_tens_x, number_y);
        g.drawImage(Assets.zero, number_ones_x, number_y);
    }

    if (tens == 1) {
        g.drawImage(Assets.one, number_tens_x, number_y);
    }

    if (tens == 2) {
        g.drawImage(Assets.two, number_tens_x, number_y);
    } 

    if (tens == 3) {
        g.drawImage(Assets.three, number_tens_x, number_y);
    } 

    if (tens == 4) {
        g.drawImage(Assets.four, number_tens_x, number_y);
    } 

    if (tens == 5) {
        g.drawImage(Assets.five, number_tens_x, number_y);
    } 

    if (tens == 6) {
        g.drawImage(Assets.six, number_tens_x, number_y);
    } 

    if (tens == 7) {
        g.drawImage(Assets.seven, number_tens_x, number_y);
    } 

    if (tens == 8) {
        g.drawImage(Assets.eight, number_tens_x, number_y);
    } 

    if (tens == 9) {
        g.drawImage(Assets.nine, number_tens_x, number_y);
    } 

    if (hundreds == 1) {
        g.drawImage(Assets.one, number_hundreds_x, number_y);
    }

    if (hundreds == 2) {
        g.drawImage(Assets.two, number_hundreds_x, number_y);
    } 

    if (hundreds == 3) {
        g.drawImage(Assets.three, number_hundreds_x, number_y);
    } 

}

那么我怎样才能让我的计数器正确计数呢？而且，有没有更好的方法来格式化我的代码，这样我就不用那么多 if 语句了？谢谢!

下面是屏幕的样子:

Answer 1

改变

public int IncreaseOnes() {
    ...
    count = count++;
    ...
}

public int DecreaseOnes() {
    ...
    count = count--;
    ...
}

到

public int IncreaseOnes() {
    ...
    count++;
    ...
}

public int DecreaseOnes() {
    ...
    count--;
    ...
}

检查 this有关post-pre 递增和递减运算符的更多详细信息。