Question

for Java

define a class for a triangle of any size: including two constructors

1) default color

2) accepts 3 parameters (don't forget set and get methods) and include a method for the area of the triangle

create a driver program that instantiates two triangles:

1) using the default color

2) using the second constructor

sketch the UML diagram

Answer 1

//Java code

public class Triangle {

    private String color;
    private double height,base;

    //default constructor
    public Triangle()
    {
        height=1;
        base=1;
        color="White";
    }
    //Constructor taking three parameters

    /**
     *
     * @param height
     * @param base
     * @param color
     */
    public Triangle(double height,double base, String color)
    {
        this.height= height;
        this.base= base;
        this.color= color;
    }
    //getters

    public double getBase() {
        return base;
    }

    public double getHeight() {
        return height;
    }

    public String getColor() {
        return color;
    }
    //setters

    public void setHeight(double height) {
        this.height = height;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public void setBase(double base) {
        this.base = base;
    }
    //Calculate area

    /**
     *
     * @return area of triangle
     */
    public double getArea()
    {
        return (base*height)/2;
    }

    //override toString() to print Triangle Object info

    @Override
    public String toString() {
        return "Triangle: Height: "+height+" base: "+base+" Color: "+color+" Area: "+getArea();
    }
}

public class Main {
    public static void main(String[] args)
    {
        //create object of Triangle using default constructor
        Triangle triangle= new Triangle();
        //create object of triangle using parameterised constructor
        Triangle triangle1= new Triangle(2,3,"Red");
        //Print info of both object
        System.out.println(triangle);
        System.out.println(triangle1);
    }
}

//Output

//UML Diagram

//if you need any help regarding this solution............ please leave a comment........... thanks