Question

我有一个爆米花的arraylist由以下制作：

public class Popcorn
{
int posX;
int posY;
int speed;
int taps;

public Popcorn(int x, int y)
{
    posX = x;
    posY = y;
    speed = PowerConstants.popcorn_speed;
    taps = 0;
}

public void tick()
{
    posY += speed;
}

public int getX()
{
    return posX;
}

public int getY()
{
    return posY;
}

public void addTap()
{
    taps++;
}

public int getTaps()
{
    return taps;
}
}

我想在这些爆米花上使用不同的通电，其中一个涉及使爆米花在屏幕上下降得更快（因此处理速度）一段时间。通电工作（定时系统也是如此）;然而，它只会影响新创建的爆米花，而不会影响屏幕上已有的爆米花。以下是相关代码：

ArrayList <Popcorn> popcorns;
Image happyPopcorn;

popcorns = new ArrayList<Popcorn>();
happyPopcorn = Assets.happyPopcorn;

//This section is in the updateRunning() section of my code

if ((PowersScreen3.getDecodedChoice() == Assets.powerup_speedup && System.currentTimeMillis() - power_start_3 <= 10000) ||
            (PowersScreen2.getDecodedChoice() == Assets.powerup_speedup && System.currentTimeMillis() - power_start_2 <= 10000) ||
            (PowersScreen.getDecodedChoice() == Assets.powerup_speedup && System.currentTimeMillis() - power_start <= 10000)) {
 //The above if-state is just checking the timing system and deciding which powerup was chosen
        PowerConstants.popcorn_speed = 4;
        Log.d("Powerups", "all popcorn speed up");
    }

有意义的是，通过改变速度常数，新形成的爆米花的速度会发生变化。但是，我也希望arraylist中的当前爆米花也能改变它们的速度。我怎样才能做到这一点？

更改Arraylist中所有项目的速度值

0 个答案: