import java.util.Collection;

/**
 * ListInterface
 */
public interface ListInterface<E> extends Collection<E>{

    /**
     * Checks if the value is inside our List
     * @param i value to check
     * @return boolean value of the presence of the value
     */
    public abstract boolean contains(Object i);

    /**
     * Remove the value at a certain index
     * @param i index to remove
     * @return status of the removal
     */
    public abstract boolean remove(Integer i);

    /**
     * Get the first value of our List
     * @return the first value of our List
     */
    public abstract E getFirst();

    /**
     * Get the last value of our List
     * @return the last value of our List
     */
    public abstract E getLast();

    /**
     * add a value to our List
     * @param elem value to add
     * @return status of the adding
     */
    public abstract boolean add(E elem);
}