$1.$Create an interface called Items. It

should define at least the following

methods:

a$.$ public void add$($ Object

item $)-$ adds a single

object to the collection.

b$.$ public Object get $($ int

index $)-$ returns an item at

a specific index.

c$.$ public int size$()-$

returns the number of items

stored in the collection.

d$.$ public void addAll$($

Object$[]$ items $)-$ adds

all of the elements in the

array to the collection.

$2.$Write a class called

AbstractItems that implements

the Items interface. It should

provide concrete implementations

of at least the following methods:

a$.$ public void addAll$($

Object$[]$ items $)-$This

should simply loop and call

the add method for each

item in the array.

b$.$ public String

toString$()-$ returns a

string that lists all of the

items on a single line. For

example, if the collection

contained the strings "abc",

$"123",$ and "cat" the

toString method should

return something like "abc

$123$ cat". This method

should use a loop and call

the get method.