Java Problem Description: Design a class named Triangle that extends GeometricObject. The class contains: Three double data fields named side1, side2, and side3 with default values 1.0 to denote three sides of the triangle.

A constructor that creates a triangle with the specified side1, side2, and side3. The get and set methods for all three data fields. A method named getArea() that returns the area of this triangle. A method named getPerimeter() that returns the perimeter of this triangle. A method named toString() that returns a string description for the triangle. The toString() method is implemented as follows:

return "Triangle: side1 = " + side1 + " side2 = " + side2 + " side3 = " + side3;

Coding:

public class Assignment1 { public static void main(String[] args) { Triangle triangle = new Triangle(1, 1.5, 1); triangle.setColor("yellow"); triangle.setFilled(true);

System.out.println(triangle); System.out.println("The area is " + triangle.getArea()); System.out.println("The perimeter is " + triangle.getPerimeter()); System.out.println(triangle); } }

public abstract class GeometricObject { private String color = "white"; 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 + " color: " + color + " and filled: " + filled; }

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

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

class Triangle extends GeometricObject { // Implement it }