Hello!

I need help with these following exercises:

Setup

Create a Java class called ListProcessor

ListProcessor should contain all of the following methods specified in the below exercises. (*I've done this)

I need help with:

Exercise 1: Populating Lists

Implement methods with the following headers:

public int[] filledArray(int from, int to) 

and

public List filledList(int from, int to)` 

These methods should return populated lists with integer values in the range from the lower bound from (inclusive) until the upper bound to (exclusive).

e.g. filledArray(0, 5); should return the following array [0,1,2,3,4]

Special cases:

If from == to, an empty list should be returned.

If to < from, an IllegalArgumentException should be thrown.

Exercise 2: Shuffling Lists

Implement methods with the following headers:

public int[] shuffled(int[] numbers) 

and

public List shuffled(List numbers) 

These methods should return a shuffled list of numbers, by randomly swapping elements to randomise the ordering.

requirement: You are not allowed to use Collections.shuffle(), and the argument list should notbe mutated. That is to say, you must make a local copy of the argument.

note: These two methods, as well as the pairs in exercise 3 and 4 are overloaded. In short, the compiler can distinguish between two methods with the same name based on the type(s) of the parameter(s) it is passed. Overloading should be used sparingly as it can affect readability, but in this case, it is reasonable to say that the programmer should know whether he/she is shuffling a list or an array, so naming the methods shuffleArray and shuffleList instead adds no extra information. Note that you cannot overload by return type, as overloading works only by looking at different signatures. For the official definition (with examples), please see Overloading Methods section at the bottom of this page.

I don't really understand Arrays and ArrayLists so please explain it in a simple manner so I can understand. How do I solve these exercises?

Appreciate the help! Thank you :)