Constructors with the same primitive type as parameter

I have an assignment that asks me to create a Data Class as a "Node Center" for all my other classes, such as a class for LinkedList, Stack, & Queue to "feed" on. I’m creating constructors in the Data class to work on the LinkedList, Stack, & Queue classes. I wasn’t having any problems until I implemented my constructor for my Queue. In my Stack portion of the Data class, I had already created a public Data constructor with an int as my parameter in the constructor. When I try to create another public Data constructor with an int as my parameter for the Queue, I get the error: Data(int) is already defined in Data. Here is my Stack code:

/*
    STACK WITH AN ARRAY
    */
    int size; //initialize size
    int stackArray[]; //initialize array
    int top; //initialize top

    public Data(int size) //constructor
    {
        this.size = size;
        this.stackArray = new int[size];
        this.top = -1;
    }

And here is my Queue code:

/*
    QUEUE WITH AN ARRAY
    */
    public int Queue[]; //establish queue array and variables
    public int front;
    public  int rear;
    public int queueSize;
    public int len;

    public Data(int nQueue)//constructor
    {
        size =nQueue;
        len = 0;
        Queue = new int[size];
        front = -1;
        rear = -1;
    }

How do I fix this so I can have 2 constructors with the same parameter type?

public Data(int size, boolean isQueue)//constructor
{
  if(isQueue){
    len = 0;
    Queue = new int[size];
    front = -1;
    rear = -1;
  }else{
    this.size = size;
    this.stackArray = new int[size];
    this.top = -1;
  }
}