(Triangle class) Design a new Triangle class that extends the abstract GeometricObject class. Draw the UML diagram for the classes Triangle and GeometricObject and then implement the Triangle class

/*********************************************************************************
* (Triangle class) Design a new Triangle class that extends the abstract         *
* GeometricObject class. Draw the UML diagram for the classes Triangle and       *
* GeometricObject and then implement the Triangle class. Write a test program    *
* that prompts the user to enter three sides of the triangle, a color, and a     *
* Boolean value to indicate whether the triangle is filled. The program should   *
* create a Triangle object with these sides and set the color and filled         *
* properties using the input. The program should display the area, perimeter,    *
* color, and true or false to indicate whether it is filled or not.              *
*********************************************************************************/
import java.util.Scanner;

public class Exercise_13_01 {
	/** Main method */
	public static void main(String[] args) {
		// Create a Scanner
		Scanner input = new Scanner(System.in);

		// Prompt the user to enter three sides of a triangle a color 
		// and a Boolean value to indicate whether the triangle is filled
		System.out.print("Enter three sides of the triangle: ");
		double side1 = input.nextDouble();
		double side2 = input.nextDouble();
		double side3 = input.nextDouble();

		System.out.print("Enter a color: ");
		String color = input.next();

		System.out.print("Is the triangle filled (true / false)? ");
		boolean filled = input.nextBoolean();

		// Create a Triangle
		Triangle triangle = new Triangle(side1, side2, side3, color, filled);

		System.out.println(triangle);
	}
}

GeometricObject.java 

public abstract class GeometricObject {
	private String color = "while";
	private boolean filled;
	private java.util.Date dateCreated;

	/** Construct a default geometric object */
	protected GeometricObject() {
		dateCreated = new java.util.Date();
	}

	/** Construct a geometric object with color and filled value */
	protected GeometricObject(String color, boolean filled) {
		dateCreated = new java.util.Date();
		this.color = color;
		this.filled = filled;
	}

	/** 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,
	 *  the get method is named isFilled */
	public boolean isFilled() {
		return filled;
	}

	/** Set a new filled */
	public void setFilled(boolean filled) {
		this.filled = filled;
	}

	/** Get dateCreated */
	public java.util.Date getDateCreated() {
		return dateCreated;
	}

	@Override
	public String toString() {
		return "created on " + dateCreated + "\ncolor: " + color +
			" and filled: " + filled;
	}

	/** Abstract method getArea */
	public abstract double getArea();

	/** Abstract method getPerimeter */
	public abstract double getPerimeter();
}

Triangle.java

/*********************************************************
*                       Triangle                         *
*--------------------------------------------------------*
* -side1: double                                         *
* -side2: double                                         *
* -side3: double                                         *
*--------------------------------------------------------*
* +Triangle()                                            *
* +Triangle(side1: double, side2: double, side3: double) *
* +Triangle(side1: double, side2: double, side3: double, *
* 		color: string, filled: boolean)                    *
* +getSide1(): double                                    *
* +getSide2(): double                                    *
* +getSide3(): double                                    *
* +setSide1(side1: double): void                         *
* +setSide2(side2: double): void                         *
* +setSide3(side3: double): void                         *
*********************************************************/
public class Triangle extends GeometricObject {
	private double side1; 
	private double side2; 
	private double side3;

	public Triangle(){
	} 

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

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

	/** Return side1 */
	public double getSide1() {
		return side1;
	}

	/** Set side1 to a new lentgh */
	public void setSide1(double side1) {
		this.side1 = side1;
	}

	/** Return side2 */
	public double getSide2() {
		return side2;
	}

	/** Set side2 to a new lentgh */
	public void setSide2(double side2) {
		this.side2 = side2;
	}

	/** Return side3 */
	public double getSide3() {
		return side3;
	}

	/** Set side3 to a new lentgh */
	public void setSide3(double side3) {
		this.side3 = side3;
	}

	@Override /** Return area of this Triangle */
	public double getArea() {
		double s = (side1 + side2 + side3) / 2;
		return Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
	}

	@Override /** Return perimeter of this triangle */
	public double getPerimeter() {
		return side1 + side2 + side3;
	}

	@Override /** Return a string discription of the object */
	public String toString() {
		return super.toString() + "\nArea: " + getArea() + 
			"\nPerimeter: " + getPerimeter(); 
	}
}