java - 如何平移矩形位置？

Question

我有一个每 3 秒创建一次的矩形。

 public void newRect(){
        rect=Pools.obtain(Rectangle.class);
        rect.set(rX, Y, 90, 90);
        rectangles.add(rect);//adding to the ArrayList
    }//this method gets called when condition==true

问题是我这样做时遇到错误

while(rectIterator.hasNext()){
   Rectangle rect=rectIterator.next();
}//and I don't know how to make the rectangle move(all the rectangles that spawns).

在我的 Sprite 上我能够做到这一点

 while(sprIterator.hasNext()){
            Sprite spr=hIterator.next();
            spr.draw(batch);
            spr.translateY(600*deltaTime);
        }

更新 初始化矩形矩形时出现错误

Exception in thread "LWJGL Application" java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
    at java.util.ArrayList$Itr.next(ArrayList.java:851)
    at com.msl.explode.Bitter.draw(Bitter.java:49)
    at com.msl.explode.MyGdxGame.render(MyGdxGame.java:51)
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:215)
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:120)

Answer 1

你有一个 ConcurrentModificationException : 我建议您使用CopyOnWriteArrayList而不是经典ArrayList .