Listy Generyczne - Tablica V2

public interface IMyList<T> {
    void add(T element);
    public void add(int index, T element);
    public void clear();
    public T pop();
    public T get(int index);
    public int size();
    public T remove(int index);
}

import java.util.Arrays;
public class MyCustomList<T> implements IMyList<T>
{
    T[] ListOb;

    final int DefaultLenght = 10;
    int PositionIndex;
    int ListMaxIndex;


    public MyCustomList()
    {
        ListOb = (T[])new Object[DefaultLenght];
        ListMaxIndex = DefaultLenght;
        PositionIndex = 0;
    }

    @Override
    public void add(T Element)
    {
        if (PositionIndex >= ListMaxIndex)
        {
            resizeList(ListOb.length + 1);

        }
        ListOb[PositionIndex] = Element;
        PositionIndex++;
    }

    @Override
    public void add(int Index, T Element)
    {
        if(Index >= ListMaxIndex)
        {
            resizeList(Index + 1);
        }
        ListOb[Index] = Element;
        if(Index >= PositionIndex)
        {
            PositionIndex = Index + 1;
        }
    }

    @Override
    public void clear()
    {
        ListOb = (T[])new Object[DefaultLenght];
        ListMaxIndex = DefaultLenght;
        PositionIndex = 0;
    }

    @Override
    public T pop()
    {
        if(PositionIndex == 0)
        {
            return null;
        }
        T TempOb = ListOb[PositionIndex - 1];
        ListOb[PositionIndex - 1] = null;
        PositionIndex--;
        return TempOb;
    }

    @Override
    public T get(int Index)
    {
        if(Index <= ListMaxIndex)
        {
            return ListOb[Index];
        }
        else return null;
    }

    @Override
    public int size()
    {
        return PositionIndex;
    }

    @Override
    public T remove(int Index)
    {
        if(Index > ListMaxIndex)
        {
            return null;
        }
        T TempOb = ListOb[Index];
        ListOb[Index] = null;
        if(Index == PositionIndex - 1)
        {
            PositionIndex--;
        }
        return TempOb;
    }

    public void resizeList(int NewSize)
    {
        ListOb = Arrays.copyOf(ListOb, NewSize);
        ListMaxIndex = NewSize - 1;
    }
}

public class GenericList{
    public static void main(String[] args){
    IMyList<Integer>list;
    list = new MyCustomList<>();
    for(int TempNumber = 0; TempNumber < 20;i++)
    {
        list.add(TempNumber);
    }
    list.add(25,25);
    System.out.println(list.pop());
    System.out.println(list.pop(20));
    System.out.println(list.get(20));
    list.remove(10);
    list.clear();
    list.add(10);
    System.out.println(list.pop());
    }
}