java - 从矩形数组中检索矩形时出现空指针异常

Question

所以我有一个处理按钮的类，我有一个矩形数组，其中包含 2 个单独的矩形形状。现在，当我创建一个变量来检索数组的第 0 个索引时，它会给我一个 nullpointerexception 我一直在挠头，我已经明确声明并初始化了数组，并使其大小适合包含 2 个矩形，并且已将这些分配给索引。我一定是错过了一些我似乎无法弄清楚的非常小的东西。

下面我放了相关的代码:

public class MenuButton {

private int height;
private int width;
private float positionX;
private float positionY;

//private ArrayList<Rectangle> rects;
private Rectangle rects[];

private Rectangle play;
private Rectangle touchToPlay;

private boolean isTouched;

public MenuButton(int height, int width, float positionX, float positionY){

    this.height = height;
    this.width = width;
    this.positionX = positionX;
    this.positionY = positionY;

    isTouched = false;
    Rectangle rects[] = new Rectangle[2];
    play = new Rectangle(positionX, positionY, width, height);
    touchToPlay = new Rectangle(positionX, positionY, width, height);


    //can clean this up by introducing initButtons() to assign buttons to
    //indexes of the array
    rects[0] = play;
    rects[1] = touchToPlay;

}   


public boolean isClicked(int index,float screenX, float screenY){

    //ERROR IS BELOW THIS LINE  
    Rectangle rect = rects[0];

    return rect.contains(screenX, screenY);
} 

Answer 1

你是 shadowing变量 rects。替换

Rectangle rects[] = new Rectangle[2];

与

rects = new Rectangle[2];