Getting an object to print to string (instead of hashcode.)

import java.util.Scanner;
class GeometricObject {   
String color;
boolean filled;
double area;
double perimeter;

  /** Construct a geometric object with the specified color 
    *  and filled value */
  GeometricObject() { }
  /** Return color */
  public String getColor() {
    return color;
  }

  /** Set a new color */
  public void setColor(String color) {
    this.color = color;
  }

  /** Return filled. Since filled is boolean, 
     its get method is named isFilled */
  public boolean isFilled() {

    return filled;
  }

  /** Set a new filled */
  public void setFilled(boolean filled) {
         if (filled == true){
          System.out.println(" is filled");
      }else{
          System.out.println(" is not filled");
      }
    this.filled = filled;

  }

  public static void main(String[]args){

      System.out.print("Enter color and isFilled (true or false): " );

      Scanner input = new Scanner(System.in);
      String color = input.next();
      boolean filled = input.nextBoolean();

     System.out.print("Enter three points for a triangle: ");

      double x1 = input.nextDouble();
      double y1 = input.nextDouble();
      double x2 = input.nextDouble();
      double y2 = input.nextDouble();
      double x3 = input.nextDouble();
      double y3 = input.nextDouble();

      double d1 = (((x2 - x1)*(x2 - x1)) + ((y2 - y1)*(y2 - y1)));
      double d2 = (((x2 - x3)*(x2 - x3)) + ((y2 - y3)*(y2 - y3)));
      double d3 = (((x3 - x1)*(x3 - x1)) + ((y3 - y1)*(y3 - y1)));

      double side1 = (Math.sqrt(d1));
      double side2 = (Math.sqrt(d2));
      double side3 = (Math.sqrt(d3));


    GeometricObject Triangle = new GeometricObject();
    Triangle myTriangle1 = new Triangle(); 


    //Triangle myTriangle1 = new Triangle(side1, side2, side3);

    System.out.print(myTriangle1.toString() );

    //System.out.printf("It has area %,.2f and perimeter %,.2f.", area, perimeter);


}
 public class Triangle extends GeometricObject {
    public double side1;
    public double side2;
    public double side3;
    double area;
    double perimeter;

    public Triangle() {
    }

    public Triangle(double side1, double side2, double side3){
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;

    } 

   //Triangle myTriangle1 = new Triangle(side1, side2, side3);

    public Triangle(double side1, double side2, double side3, 
            String color, boolean filled){
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
        setColor(color);
        setFilled(filled);

    }
    public void setArea(double side1, double side2, double side3){
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;

    }    

   public double getArea(){
       area = (side1 + side2 + side3)/2;
       return area;
}
    public double getPerimeter(){
        perimeter = side1 + side2 + side3;
        return perimeter;
    }

  public String getColor() {
    return color;
  }

  public void setColor(String color) {
    this.color = color;
  }

  public boolean isFilled() {


     return filled;

  }
  public void setFilled(boolean filled) {
    this.filled = filled;
  }


   @Override
        public String toString() {
            return super.toString() + "The " + this.getColor() + " triangle is" + 
                    this.isFilled() +". It has area of " + this.getArea() + " and perimeter of " + 
                            this.getPerimeter() + ".";
   }   

  /*public void printObject() {
    System.out.print("The "  + Triangle.getColor() + "triangle is" + Triangle.isFilled() + " .\n");
    System.out.printf("The area is %,.2f%, and the perimeter is %,.2f%", getArea(), getPerimeter());
*/
  }