toString

[Kirstie Fran]

I need to display the value of 'sum1' after doing some math with it, but i keep getting: "average: gettinganestimate.Average@5f893efe"
someone said it had to do with it being and object and to use a toString method, but that isn't working out too well; I keep getting errors within the method. I had solved the problem for like half a second before, but then i did something and it went away. Any suggestions?

[Henry Wong]

Kirstie Fran wrote:
someone said it had to do with it being and object and to use a toString method, but that isn't working out too well; I keep getting errors within the method. I had solved the problem for like half a second before, but then i did something and it went away. Any suggestions?

It would help if you tell us the details of what you did -- TellTheDetails.

Henry

[Kirstie Fran]

package gettinganestimate;

public class Average {

    private double sum1 = 0, sum2;



    public double getAverage(double Average) {
        

        return Average;  // Provide a “getAverage” method that returns the
        //current average (a real number).
    }

    private void add(double x) {
//         = 0;
//        int i;
        sum1 = sum1 + x;
//        sum2 = sum2 + i;

    }

    
//    public String toString {
//        return sum1;       //=(sum1 / sum2);
//    }

    public static void main(String[] args) {
        // TODO code application logic here
        Average sum1 = new Average();   //average sum1 = new Average();
        Average sum2 = new Average();    //average sum1 = new Average();
        int i;
        double x = 0;

        for (i = 0; i < 20; i++) {
            x = 20.0 * Math.random();
            sum1.add(x);// Add instance variables of the appropriate type to 
            //hold the current sum and the number of items that have been added.
            sum2.add(i);
            System.out.println("" + i + ": " + x + "\taverage: " + sum1.toString());
        }
        if (sum1.getAverage(x) > sum2.getAverage(i)) {
            System.out.println("Sum 1 is greater");
        } else {
            System.out.println("Sum 2 is greater");
            System.out.println("Final averages: " + sum1.toString() + ", "
                    + sum2);
//            System.out.println(Average.toString());
//             Provide a “toString”
//            method that returns the current average as a string.
        }
    }
}
/**
 *Using the prototype provided, modify it as follows:
//Add a default constructor for the class.

//Provide two “add” methods – one to add real numbers and the second to add
integers to the sum.

 */

and i end up getting things like:

run:
0: 10.113957033713675 average: gettinganestimate.Average@2b86c6b2
1: 6.467450812669018 average: gettinganestimate.Average@2b86c6b2
...

Sum 2 is greater
Final averages: gettinganestimate.Average@2b86c6b2, gettinganestimate.Average@1d5ee671
BUILD SUCCESSFUL (total time: 0 seconds)

[Henry Wong]

You didn't override the toString() method. The toString() method inherited from the Object class, just states the object class type and the identity hash code.

Henry

[Kirstie Fran]

well one of the suggestions that netbeans gave me was to place "@override" just outside of the toString() Method, but that didn't work out to well for me. So how would i actually go about doing this? because i want the actually average to appear

[Henry Wong]

Kirstie Fran wrote:So how would i actually go about doing this? because i want the actually average to appear

Well, you need to create a valid toString() method. And in that method, you need to return a String object -- which is created from the value contained in the sum1 variable.... For that, take a look at the java.lang.Double class.

Henry

[Kirstie Fran]

Ok, i got that part sorted out now.

    @Override
   public String toString () {
             return " " + sum1;  //=(sum1 / sum2);
    }

thanks!
i'm just having some issues with the "average" class

[Campbell Ritchie]

What went wrong when yo added @Override? Did you get a "doesn't override" compiler error? That is the whole idea of @Override; if you make a tiny spelling mistake you get a compiler error.