Write a method in the HeapIntPriorityQueue class called toString that returns a string representation of the elements in the queue, such as "[42, 50, 45, 78, 61]". The order of the elements in the string does not matter as long as they are all present in the proper format.

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.