Returning location instead of value?

I created a Function class, with a method Add that can add two fractions together. The problem is that instead of getting a value when added together, I get the reference location(I think). I know this is probably something simple, but please let me know what I'm doing wrong!

Here is my Fraction class:

Code:

---

public class Fraction
{
  private int n, d;
 
  public Fraction(int n, int d) {
  }

public Fraction add(Fraction other)
  {
      int n,d;
      n = (this.n*other.d) + (this.d+other.n);
      d = (this.d*other.d);
      return new Fraction(n,d);
     
  }
 
}

---

Here is my test method:

Code:

---

public static void testAdd()
  {
      Fraction f1, f2, f3;
      f1 = new Fraction(1,4);
      f2 = new Fraction(1,2);
      f3 = new Fraction(3,4);
       
      if (f1.add(f2) != f3)
      {
        System.out.println("Error in testAdd: Expected 3/4, found: " + f2.add(f1));
      }

---

OUTPUT:

Quote:

---

Error in testAdd: Expected 3/4, found: Fraction@4e82701e

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The reason you're getting the reference location is that you haven't overridden toString(), which by default returns a string representing the location.

Also, consider that it's trying to calculate the denominator by multiplying 4 by 2, which isn't what you intend.

Edit: You need to define an equals() method instead of using == and != to compare equality. Again, that compares by reference.