Question

in java please

Project 2: The Triangle Class

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 no-arg constructor that creates a default triangle.

• A constructor that creates a triangle with the specified side1, side2, and side3.

• The accessor 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.

For the formula to compute the area of a triangle, see Exercise 5.19. The toString() method is implemented as follows:

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

Coding: (Copy and Paste Source Code here)

public class TheTriangleClass {

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);

}

}

class Triangle extends GeometricObject {

// Implement it (See below for a complete example, the example is for Rectangle)

}

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,
29 * 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();
}

Answer 1

Program code:

Output:

UML diagram that involves the classes Triangle and GeometricObject:

Code to copy:

GeometricObject.java

public class GeometricObject {
   private String color;
   private boolean filled;

   public GeometricObject() {
       color = "white";
       filled = true;
   }
   public GeometricObject(String color, boolean filled) {
       this.color = color;
       this.filled = filled;
   }

   /**Getter method for color*/

   public String getColor() {
       return color;
   }

   /**Setter method for color*/
   public void setColor(String color) {
       this.color = color;
   }

   /**Getter method for filled. Since filled is boolean,
   * so, the get method name is isFilled*/
  
   public boolean isFilled() {
       return filled;
   }

   /**Setter method for filled*/
   public void setFilled(boolean filled) {
       this.filled = filled;
   }

   /** Return a string representation of this object*/
   public String toString() {
       return "Color: " + color + " and filled: " + filled;
   }
}

Triangle.java

    public class Triangle extends GeometricObject {
  
       /*declaration of three double data fields named
       * side1, side2, and side3 with default values 1.0*/
       double side1 = 1.0;
       double side2 = 1.0;
       double side3 = 1.0;
  
       /*A no-arg constructor that creates a default triangle.*/
       public Triangle() {
          super();
           side1 = 0.0;
           side2 = 0.0;
           side3 = 0.0;
       }
  
        /*A constructor that creates a rectangle with the specified sides.*/
      public Triangle(double a, double b, double c, String color, boolean filled) {
           super(color, filled);
           side1 = a;
           side2 = b;
           side3 = c;
       }
  
       /*getter method for side1*/
       public double getSide1() {
           return side1;
       }
  
       /*setter method for side1*/
       public void setSide1(double side1) {
           this.side1 = side1;
       }
      
       /*getter method for side2*/
       public double getSide2() {
           return side2;
       }
  
       /*Setter method for side2*/
       public void setSide2(double side2) {
           this.side2 = side2;
       }
  
       /*getter method for side3*/
       public double getSide3() {
           return side3;
       }
  
       /*setter method for side3*/
       public void setSide3(double side3) {
           this.side3 = side3;
       }
  
       public void show() {
           System.out.println(side1+","+side2+","+side3+",");
       }
  
       /* method to calculate area of triangle */
       public double getArea(){
           double s=(side1+side2+side3)/2;
            double area=s*(s-side1)*(s-side2)*(s-side3);
            return area;
  
       }
  
       /* method to calculate perimeter of triangle */
       public double getPerimeter(){
           return (side1 + side2 + side3);
       }
  
       /*toString method that returns string representing sides of triangle*/
       public String toString(){
          
           return "Triangle: side1 = " + side1 + " side2 = " + side2 +
                   " side3 = " + side3 +" "+
           super.toString();
       }
   }
  

Test program Asg1.java

   /*test program that creates a Triangle object with
   * sides 1, 1.5, 1, sets color yellow and filled true*/
   public class Asg1 {
       public static void main(String[] args) {
           //create an object of Triangle class
           Triangle my = new Triangle(1,1.5,1,"yellow", true);
           //Call method getArea() to get the area of Triangle
           System.out.println("Area of Triangle " +my.getArea());
           //Call method getPerimeter() to get the perimeter of Triangle
           System.out.println("Perimeter of triangle " +my.getPerimeter());
           //call getter method getColor()
           System.out.println("color of the Triangle is " +my.getColor());
           //call getter method isFilled()
           System.out.println("is triangle filled " +my.isFilled());
       }
   }
Note:

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