在Java中查找调度对象列表中的空槽

import java.util.ArrayList;

public class Scheduler {
    private ArrayList<Object> scheduleList;

    public Scheduler() {
        scheduleList = new ArrayList<>();
    }

    public void addSchedule(Object schedule) {
        scheduleList.add(schedule);
    }

    public int findEmptySlot() {
        for (int i = 0; i < scheduleList.size(); i++) {
            if (scheduleList.get(i) == null) {
                return i;
            }
        }
        return -1;
    }

    public static void main(String[] args) {
        Scheduler scheduler = new Scheduler();
        scheduler.addSchedule("Schedule 1");
        scheduler.addSchedule(null);
        scheduler.addSchedule("Schedule 3");

        int emptySlotIndex = scheduler.findEmptySlot();
        if (emptySlotIndex != -1) {
            System.out.println("Found empty slot at index: " + emptySlotIndex);
        } else {
            System.out.println("No empty slot found.");
        }
    }
}