- Three double data fields named side1,side2, and side 3 with default values 1.0

Question

- Three double data fields named side1,side2, and side 3 with default values 1.0 to denote three sides of the traingle.
- A no-arg constructor that creates a default triangle.
- A constructor that creates a traingle 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 area of a triangle, See exercise 2.21. The toString() method is implemented as follows:

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

Draw the UML diagram for the classes Triangle and GeometricObject. Implement the class. Write a test program that creates a Triangle object with sides 1, 1.5, 1, color yellow and filled true, and displays the area, perimeter, color, and whether filled or not.

ComputeArea.java:
public class ComputeArea {
public static void main(String[] args) {
double radius; // Declare radius
double area; // Declare area

// Assign a radius
radius = 20; // New value is radius

// Compute area
area = radius * radius * 3.14159;

// Display results
System.out.println("The area for the circle of radius " +
radius + " is " + area);
}
}

GeometricObject.java:
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();
}

/** 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,
* so, the get method name is 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;
}

/** Return a string representation of this object */
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();
}

Explanation / Answer

public Geometricobject(String color, double weight) { this.color = color; this.weight = weight; } //getColor() public String getColor() { return color; } //setColor public void setColor(String color) { this.color = color; } //getWeight public double getWeight() { return weight; } //setWeight public void setWeight(double weight) { this.weight = weight; } //for find area and perimeter public abstract double findArea(); public abstract double findPerimeter(); } //Triangle class extends Geometricobject class Triangle extends Geometricobject { //variable declartion double side1,side2,side3; boolean filled; //findArea() public double findArea() { //varaible declartion double area,s; //calculatting s s = ( side1 + side2 + side3 ) /2; //calculatting area area = Math.sqrt(s * (s-side1) * (s-side2) * (s-side3)); //return area return area; }//end findArea() //Triangle public Triangle(double s1,double s2,double s3) { side1=s1; side2=s2; side3=s3; } public void setFilled(boolean tri) { filled = tri; } public boolean getFilled() { return filled; } //findPerimeter() public double findPerimeter() { double perimeter; //calculatting perimeter perimeter = (side1 + side2 + side3); return perimeter; } public String toString() { return "Triangle: side1 = " + side1 + " side2 = " + side2 + "side3 = " + side3; } public static void main(String args[]) { Triangle tri = new Triangle(1, 1.5, 1); tri.setColor("yellow"); tri.setFilled(true); System.out.println("The area is " + tri.findArea()); System.out.println("The perimeter is " + tri.findPerimeter()); System.out.println(" color is " + tri.getColor()); System.out.println("filled " + tri.getFilled()); } } I hope this will helps to You !

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