Answered: JAVA PLEASE Starting with your…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

JAVA PLEASE

Starting with your solution to the previous task, add the following methods to your ScaleneTriangle class to extend its functionality.

A default (or "no-argument" or "no-arg") constructor that constructs a Triangle object using default values.
An overloaded constructor that constructs a Triangle object with the given values.
A method named getArea() which returns the area of a triangle. This method returns a double. The are is calculated by: √(s * (s - sideA) * (s - sideB) * (s - sideC)) where s = (sideA + sideB + sideC) / 2

Write the ScaleneTriangle class in the answer box below assuming that the superclass is given.

For example:

abstract class Triangle {

protected double sideA;

protected double sideB;

protected double sideC;

public Triangle() {

sideA = sideB = sideC = 10;

}

public Triangle(double sideA, double sideB, double sideC) {

this.sideA = sideA;

this.sideB = sideB;

this.sideC = sideC;

}

public double getSideA() {

return sideA;

}

public double getSideB() {

return sideB;

}

public double getSideC() {

return sideC;

}

public abstract double getArea();

public double getPerimeter() {

return sideA + sideB + sideC;

}

public String toString() {

return

String.format("%s:(%.2f, %.2f, %.2f)",

getClass().getName(), sideA, sideB, sideC);

}

Test
ScaleneTriangle t1 = new ScaleneTriangle();
System.out.printf("%s, perimeter=%.2f,
area= %.2f\n", t1.toString(), t1.getPerimeter (),
t1.getArea());
System.out.println(t1 instanceof Triangle);
ScaleneTriangle t1 = new ScaleneTriangle(2.0,
3.0, 4.0);
ScaleneTriangle t2 = new ScaleneTriangle();
System.out.printf("%s, perimeter=%.2f,
area= %.2f\n", t1.toString(), t1.getPerimeter (),
t1.getArea());
System.out.printf("%s, perimeter=%.2f,
area= %.2f\n", t2.toString(), t2.getPerimeter(),
t2.getArea());
Result
ScaleneTriangle: (10.00, 10.00,
10.00), perimeter=30.00,
area=43.30
true
Scalene Triangle: (2.00, 3.00,
4.00), perimeter=9.00,
area=2.90
Scalene Triangle: (10.00, 10.00,
10.00), perimeter=30.00,
area=43.30

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