Getting Object Value Out Of String?

I am trying to get a price of a certain show in a theatre but the problem is that i don't know how to use the method's String parameter:

/**
* Gives the price of the show with a given place in the room
*
* @param place the place in the room (VIP, average seating, in the back)
* @return price
*/
public double getPlaceprice(String place) {
if (place !=null) {
double p = place.getPrice();
// price= Double.parseDouble("place.getPrice()");
return p;

}
return 0;
}

Now I have a class called Place which has an attribute double price and a getter for price

public double getPrice() {
return price;

So I somehow have to alter the String parameter Place to the object(class) Place, on which i can call the method getPrice()

At least, that's what i think i have to do. Where i go wrong?