implement list use arrary

 

public class MyList<E> {
    private static final int DEFAULT_CAPACITY = 10;
    private E[] elements;
    private int size = 0;
 
    public MyList() {
        elements = new E[DEFAULT_CAPACITY];
    }
 
    public void add(E e) {
        if (size == elements.length)
            ensureCapacity();
        elements[size++] = e;
    }
 
    public void ensureCapacity() {
        int newSize = elements.length*2;
        elements = Arrays.copyOf(elements,newSize);
    }
 
    public E get(int i) {
        if (i < 0 || i >= size)
            throw new IndexOutOfBoundException("Index : " + i + " Size : " + size);
        return elements[i];
    }
}