Java Exercise: Create a class called OurArrayList and implement the following methods. Do NOT create any auxiliary memory. Include a main method and test all your methods with appropriate examples. Assume the following classes have been defined: a. Write a method called scaleByK() that takes an ArrayList of integers as a parameter and replaces every integer of value K with K copies of itself. For example, if the list stores the values (4, 1 , 2, 0 ,3) before the method is called, it should store the values (4, 4, 4, 4, 1, 2, 2, 3, 3, 3) after the method finishes executing. Zeroes and negative numbers should be removed from the list by this method.

Java Exercise:

Create a class called OurArrayList and implement the following methods. Do NOT create
any auxiliary memory.
Include a main method and test all your methods with appropriate examples.
Assume the following classes have been defined:
a. Write a method called scaleByK() that takes an ArrayList of integers as a
parameter and replaces every integer of value K with K copies of itself. For
example, if the list stores the values (4, 1 , 2, 0 ,3) before the method is called, it
should store the values (4, 4, 4, 4, 1, 2, 2, 3, 3, 3) after the method finishes
executing. Zeroes and negative numbers should be removed from the list by this
method.
b. Write a method markLength4() that takes an ArrayList of Strings as a parameter
and that places a String of four asterisks ("****") in front of every String of length
4. For example, suppose that an ArrayList called "list" contains the following
values:
(this, is, lots, of, fun, for, every, Java, programmer)
And you make the following call:
markLength4(list);
Then list should store the following values after the call:
(****, this, is, ****, lots, of, fun, for, every, ****, Java,
programmer)
Notice that you leave the original Strings in the list (this, lots, Java) but include
the four-asterisk String in front of each to mark it. You may assume that the
ArrayList contains only String values, but it might be empty.