如何创建数组列表的类并在颤动中获取数据

public class ArrayList {
    private int[] data;
    private int size;

    public ArrayList(int capacity) {
        data = new int[capacity];
        size = 0;
    }

    public void add(int value) {
        if (size == data.length) {
            // 数组已满，需要扩容
            int[] newData = new int[data.length * 2];
            System.arraycopy(data, 0, newData, 0, data.length);
            data = newData;
        }
        data[size] = value;
        size++;
    }

    public int get(int index) {
        if (index < 0 || index >= size) {
            throw new IndexOutOfBoundsException("Index out of range");
        }
        return data[index];
    }

    // 其他操作方法...

    public static void main(String[] args) {
        ArrayList list = new ArrayList(10);
        list.add(1);
        list.add(2);
        list.add(3);

        System.out.println(list.get(0)); // 输出：1
        System.out.println(list.get(1)); // 输出：2
        System.out.println(list.get(2)); // 输出：3
    }
}