Currency output unsing number format class in java

I'm not sure how to use the number format class in order to have a double format into US currency,.

For example if tuition is 1000 ,I would need it to print out $1,000.00 .I will put a piece of code in to show where my trouble is.

The public double getCurrencyInstance() is the method that I started with and it's obviously incorrect.

import java.text.NumberFormat;

public class OnlineStudent extends Student {

    private double computingFee;

    public double getCurrencyInstance(){                
        return computingFee;                
    }

    public OnlineStudent(){                
        super();               
    }

    public OnlineStudent(String fName, String lName, String id,  int credits, double rate, double compFee){
        super(fName, lName, id, credits, rate);
        this.computingFee = compFee;
    }

    public void computeTuition(){
        tuition = (rate + computingFee) * creditNum;
    }

    public String toString(){
        return ("\nOnline Student:\nFirst name:\t\t" + firstName + "\nLast name:\t\t" + lastName + "\nStudent ID:\t\t" + studentID 
                + "\nCredits:\t\t" + creditNum + "\nRate:\t\t\t" + super.rate + "\nTuition:\t\t" + super.tuition + "\nComputing Fee:\t\t"
                + getCurrencyInstance() + "\n\n");

    }
}