Java Program Practice: (The Triangle class) Design a class named Triangle that e

Question

Java Program Practice:

(The Triangle class) Design a class named Triangle that extends provided 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.

The toString() method is implemented as follows:

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

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.

ublic class Geometricobiect private String color = "white"; private boolean filled private boolean private java util.Dat ava.util.Date dateC reated /**Construct a default geometric object / ublic Geometricobject dateCreat attalea T new java util.D | ed = java. util. Date() Date); new /*Construct a geometric object with the specified color *and filled value public Geometricobject (Strinq color, boolean filled) I dateCreated = new Java. util. Date() ; this.color -color this . filled filled /Return color public String getColoz) t return collor: /Set a new color / public void setColor (String color) this. color-color; /Return filled. Since filled is boolean, its getter method is named isFilled public boolean isFilled) l return filled;

Explanation / Answer

import java.util.Scanner;

class Triangle extends GeometricObject{
private double a, b, c; // sides

public Triangle(){
   a = 1.0;
   b = 1.0;
   c = 1.0;
}
public Triangle(double a, double b, double c) {
this.a = a;
this.b= b;
this.c = c;
}
  
   public double getPerimeter() {
       return a + b + c;
   }

  
   public double getArea() {
       double s = (a + b + c) / 2;
return Math.sqrt(s * (s - a) * (s - b) * (s - c));
   }
   public String toString( )
{
       return "Triangle[side1=" +a+ ",side2="+b+ ",side3="+c+ "]";
}
   public double getA() {
       return a;
   }
   public double getB() {
       return b;
   }
   public double getC() {
       return c;
   }
  
}

class TestTriangle{
  
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       double a,b,c,area,perimeter;
       String color;
       boolean filled;
       System.out.println("Enter theree sides of triangle: ");
       a=sc.nextDouble();
       b=sc.nextDouble();
       c=sc.nextDouble();
       System.out.println("Enter color of trangle: ");
       color=sc.next();
       System.out.println("Is triangle filled ?");
       filled=sc.nextBoolean();
      
       Triangle t = new Triangle( a, b, c);
       t.setColor(color);
       t.setFilled(filled);
       System.out.println("Area: "+t.getArea()+", Perimeter: "+t.getPerimeter()+
               ", Color: "+t.getColor()+" and is Filled? "+t.isFilled());
   }
}

/*

OUTPUT:

Enter theree sides of triangle:
3
4
5
Enter color of trangle:
Blue
Is triangle filled ?
true
Area: 6.0, Perimeter: 12.0, Color: Blue and is Filled? true

*/

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