ArrayLists.java

public class ArrayLists
{
    int[] alist;
    int size;

    public ArrayLists()
    {
        alist = new int[0];
        size = 0;
    }

    public void add(int value){
        int[] temp = new int[size+1];
        for(int i = 0; i<size; i++){
            temp[i] = alist[i];
        }
        temp[size] = value;
        alist = temp;
        size += 1;
    }

    public void add(int spot, int value){
        int[] temp = new int[size+1];
        for(int i = 0; i<size+1; i++){
            if(i == spot){
                temp[i] = value;
            }else if(i < spot){
                temp[i] = alist[i];
            }else{
                temp[i] = alist[i-1];
            }
        }
        alist = temp;
        size += 1;
    }

    public void set(int spot, int value){
        alist[spot] = value;
    }

    public int size(){
        return size;
    }

    public int get(int spot){
        return alist[spot];
    }

    public int remove(int spot){
        int[] temp = new int[size-1];
        int hold = -1;
        for(int i = 0; i<size; i++){
            if(i < spot){
                temp[i] = alist[i];
            }else if(i>spot){
                temp[i-1] = alist[i];
            }else{
                hold = alist[i];
            }
        }
        alist = temp;
        size -= 1;
        return hold;
    }
}

arrayListsRunner.java

public class arrayListRunner
{
    ArrayLists a;
    public arrayListRunner(){
        a = new ArrayLists();
        for(int i = 0; i < 10; i++){
            a.add(50-i);
        }
        print();
        a.add(5,200);
        a.set(4,500);
        a.set(10,300);
        print();
        a.remove(6);
        a.remove(2);
        print();
    }
    public void print(){
        for(int i = 0; i < a.size(); i++){
            System.out.print(a.get(i)+", ");
        }
        System.out.println(" ");
        System.out.println(a.size());
    }
}