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## BJP5 Exercise 15.22: fromCounts

Author: Marty Stepp (on 2019/09/19)

Write a method called `fromCounts` that constructs and returns a new `ArrayIntList` of values given an existing `ArrayIntList` of counts. Assume that the `ArrayIntList` that is passed as a parameter stores a sequence of integer pairs that each indicate a count and a number. For example, suppose that an `ArrayIntList` called `list` stores `[5, 2, 2, -5, 4, 3, 2, 4, 1, 1, 1, 0, 2, 17]`. We will interpret this sequence of pairs to mean that you have 5 occurrences of 2, followed by two occurrences of -5 followed by 4 occurrences of 3, and so on. So the call of:

```            `ArrayIntList list2 = list.fromCounts();`
```

should cause the variable `list2` to store `[2, 2, 2, 2, 2, -5, -5, 3, 3, 3, 3, 4, 4, 1, 0, 17, 17]`.

Assume you are adding to the `ArrayIntList` class with following fields:

```public class ArrayIntList {
private int[] elementData;
private int size;

// your code goes here
}
```
Type your solution here:

This is a partial class problem. Submit code that will become part of an existing Java class as described. You do not need to write the complete class, just the portion described in the problem.

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