Java 如何跟踪我在数组中的位置

您的方法是正确的，有一种方法可以管理当前活动的摄像机，而无需使用额外变量(例如i)显式跟踪其索引.一种方法是直接存储对CameraSystem类中当前活动摄像机的引用.

class CameraSystem {
    private User user;
    private Camera[] cameraList;
    private Camera activeCamera; // Store the reference (not index) of the camera

    public CameraSystem(User user, Camera[] cameraList) {
        this.user = user;
        this.cameraList = cameraList;
        this.activeCamera = cameraList[0]; 
        // basic setup
    }

    public void goToNextCamera() {
        int nextIndex = (getIndex(activeCamera) + 1) % cameraList.length; // This is where you can store the next camera in its new index.
        activeCamera = cameraList[nextIndex];
        user.setCamera(activeCamera);
    }

    private int getIndex(Camera camera) {
        for (int i = 0; i < cameraList.length; i++) {
            if (cameraList[i] == camera) {
                return i;
            }
        }
        return -1; // If camera isn't there
    }
}

这里，在CameraSystem类中，它直接存储对活动摄像机(activeCamera)的引用.当您想要切换到下一个摄像机时，您可以迭代cameraList数组以找到当前活动摄像机的索引，然后移动到下一个索引(在到达数组的末尾时进行循环迭代).最后，更新activeCamera引用并为用户设置它.这种方法避免了对cameraIndex等额外变量的需要.