For 循环在遍历向量数组时只给出一个值 (libGDX)

Question

我只是一个初学者，所以这可能是一些我能识别的小错误，但是是的...我正在使用 libGDX 库，这是我的方法代码：

public Vector2[] initCollisionStart() {

    int i = 0;

    for (int row = 0; row < currentMapHeightTiles; row++) {
        for (int col = 0; col < 9; col++) {
            if (currentMap[row][col] == 4) {
                i++;
            } else if (currentMap[row][col] == 3) {
                i++;
            }
        }
    }

    Gdx.app.log("initCollisionStart", "works");

    Vector2[] collisionStart = new Vector2[i];

    for (int row = 0; row < currentMapHeightTiles; row++) {
        for (int col = 0; col < 9; col++) {
            if (currentMap[row][col] == 4) {
                position.x = col * 40;
                position.y = row * 40;
                collisionStart[i - 1] = position;
                System.out.println("CollisionStart[" + i + "] = " + collisionStart[i - 1]);
                i--;
            } else if (currentMap[row][col] == 3) {
                position.x = col * 40;
                position.y = row * 40;
                collisionStart[i - 1] = position;
                System.out.println("CollisionStart[" + i + "] = " + collisionStart[i - 1]);
                i--;
            }
        }
    }

    collisionInitialized = true;
    System.out.print("\n");
    for (int z = 0; z < collisionStart.length; z++) {
        System.out.println("CollisionStart[" + z + "] = " + collisionStart[z]);
    }
    return collisionStart;
}

我的输出看起来像这样：

initCollisionStart: works
CollisionStart[7] = [40.0:5760.0]
CollisionStart[6] = [80.0:5760.0]
CollisionStart[5] = [120.0:5760.0]
CollisionStart[4] = [160.0:5760.0]
CollisionStart[3] = [200.0:5760.0]
CollisionStart[2] = [240.0:5760.0]
CollisionStart[1] = [280.0:5760.0]

CollisionStart[0] = [280.0:5760.0]
CollisionStart[1] = [280.0:5760.0]
CollisionStart[2] = [280.0:5760.0]
CollisionStart[3] = [280.0:5760.0]
CollisionStart[4] = [280.0:5760.0]
CollisionStart[5] = [280.0:5760.0]
CollisionStart[6] = [280.0:5760.0]

这是我的问题。当我在这个双 for 循环之外使用它时，为什么这个 collisionStart 数组的每个值都等于 [280.0:5760.0]？我希望它与之前初始化的 return 相同的值。有办法吗？

在此先感谢您的帮助<3

Answer 1

在你的第二个双 for 循环中

 collisionStart[i - 1] = position;

应该改为

collisionStart[i - 1] = new Vector2(...);

我不确定你从哪里得到位置。
但我假设您分配给 Vector2 数组的 每个元素 的是一些 Vector2。
整个数组 指向同一个对象 ，因此你的输出在 for 循环之外。

For 循环在遍历向量数组时只给出一个值 (libGDX)

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