design a class named triangle that extends geometricobject.the class comtains:

• 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 specicied side1, 2, and 3.
• the accessor methods for all three data fields.
• A method named getArea() that returns the area of this triangle
• A method named getParameter() that returns the perimeter of this triangle.
• A method named toString() that returns description for the triangle.

For the formula to computer the area of a triangle, the toString() method is implemented as follows: return "triangle: side1=" + side1 + "side2=" + side2+"side3" + side3;

Java Implement triangle class

import java.text.*;
class triangle {
    double side1=1;
    double side2=1;
    double side3=1;

    triangle(){
    }
    triangle(double s1,double s2,double s3){
        this.side1=s1;
        this.side2=s2;
        this.side3=s3;
    }
    public void setSide1(double side1){
        this.side1=side1;
    }
    public double getSide1(){
        return side1;
    }
    public void setSide2(double side2){
        this.side2=side2;
    }
    public double getSide2(){
        return side2;
    }
    public void setSide3(double side3){
        this.side3=side3;
    }
    public double getSide3(){
        return side3;
    }
    public double getArea(){
        double sum = side1 + side2 + side3;
        double s=sum/2;
        double a=s-side1;
        double b=s-side2;
        double c=s-side3;
        double sol=s*a*b*c;
        double area=Math.sqrt(sol);
        return area;
    }

    public static void main(String[] args){
        DecimalFormat df=new DecimalFormat("##.##");
        triangle t1=new triangle();
        System.out.println("Side1: "+t1.getSide1());
        System.out.println("Side2: "+t1.getSide2());
        System.out.println("Side3: "+t1.getSide3());
        System.out.println("Area: "+df.format(t1.getArea()));

        System.out.println();
        triangle t2=new triangle(8,5,7);
        System.out.println("Side1: "+t2.getSide1());
        System.out.println("Side2: "+t2.getSide2());
        System.out.println("Side3: "+t2.getSide3());
        System.out.println("Area: "+df.format(t2.getArea()));

    }
}