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toString

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Write a method toString2 that returns a string representation of the list, such as "[5, -2, 9]". (Note: On the original section handout, this method is called toString; but Practice-It already defines a toString method for LinkedIntList for use in other problems, so we must call your method toString2 here to avoid a conflict.)

Assume that you are adding this method to the LinkedIntList class as defined below: 

public class LinkedIntList {
    private ListNode front;   // null for an empty list
    ...
}
Partial class: Write code that will become part of an existing class as described. You do not need to write the complete class, just the portion described in the exercise.

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