Question

Specifications Overview: You will write a program this week that is composed of three classes: the first class defines Ellipsoid objects, the second class defines EllipsoidList objects, and the third, Ellipsoid ListApp, reads in a file name entered by the user then reads the list name and Ellipsoid data from the file, creates Ellipsoid objects and stores them in an ArrayList of Ellipsoid objects, creates an Ellipsoid List object with the list name and ArrayList, prints the Ellipsoid List object, and then prints summary information about the Ellipsoid List object. An Ellipsoid is a 3-D object whose plane sections are ellipses defined by three axes (a, b, c) as depicted below. The formulas are provided to assist you in computing retum values for the respective methods in the Ellipsoid class described in this project. Formulas for volume (V) and surface area (S) are shown below. 4abc V = 3 (ab)+(a c)+(c) 111.6 41 " ] Page 1 of 7

This is a java file and I am very confused on how to do this project! please help!!

Answer 1

//Java code

//Create separate file for each class and file name must match the class name

import java.text.DecimalFormat;

/**
 * class Ellipsoid
 */
public class Ellipsoid {
    //Ellipsoid fields
    //three axes a,b, and c
    //declare and initialize fields
    private String label="";//empty string
    private double a=0;//initialize to 0
    private double b=0;//initialize to 0
    private double c=0;//initialize to 0

    //Constructor with args
    public Ellipsoid(String labelIn, double aIn, double bIn, double cIn) {
        // use setters to initialize fields
       setLabel(labelIn);
       setA(aIn);
       setB(bIn);
       setC(cIn);
    }

    /**
     *
     * @return label as String
     */
    public String getLabel() {
        return label;
    }

    /**
     *
     * @param label
     * @return if String is not null
     * set the label to trimmed String
     * return true
     */
    public boolean setLabel(String label)
    {
        if(label!= null)
        {
            this.label = label.trim();
            return true;
        }
        else
            return false;

    }

    /**
     *
     * @return field a as int
     */
    public double getA() {
        return a;
    }

    /**
     *
     * @param a
     * @return if a>0  set the a to passed value as arg
     * and return true
     */
    public boolean setA(double a)
    {
        if(a>0)
        {
            this.a= a;
            return true;
        }
        else
            return false;
    }

    /**
     *
     * @return field b as int
     */
    public double getB() {
        return b;
    }

    /**
     *
     * @param b
     * set the b to passed value as arg
     * @return true if b>0
     */
    public boolean setB(double b)
    {
        if(b>0)
        {
            this.b=b;
            return true;
        }
        else
            return false;
    }

    /**
     *
     * @return field c as int
     */

    public double getC() {
        return c;
    }

    /**
     *set the c to passed value as arg
     * @param c
     * @return true if c>0
     */

    public boolean setC(double c)
    {
        if(c>0)
        {
            this.c= c;
            return true;
        }
        else
            return false;
    }

    /**
     *
     * @return volume calculated as double
     */
    public double volume()
    {
        return (4* Math.PI*a*b*c)/3;
    }

    /**
     *
     * @return calculated surfaceArea as double
     */
    public double surfaceArea()
    {
        double surfaceA = (Math.pow((a*b),1.6)+Math.pow((a*c),1.6)+Math.pow((b*c),1.6))/3;
        surfaceA = 4*Math.PI*Math.pow(surfaceA,(1.0/1.6));
        return surfaceA;
    }

    /**
     *
     * @return String representation of Ellipsoid object
     */
    @Override
    public String toString() {
        // set the pattern of double value
        DecimalFormat decimalFormat = new DecimalFormat("#,##0.0###");
        return "Ellipsoid \""+label+"\" with axes a = "+getA()+", b = "+getB()+", c = "+getC()
                +" units has:\n\tvolume = "+decimalFormat.format(volume())+" square units" +
                "\n\tsurface area = "+decimalFormat.format(surfaceArea())+" cubic units";
    }
}

//==============================

import java.util.Scanner;

public class EllipsoidApp {
    public static void main(String[] args)
    {
        // Create object of Ellipsoid
        Ellipsoid ellipsoid1 = new Ellipsoid("",0,0,0);
        // Scanner object to get input
        Scanner input = new Scanner(System.in);
        //Prompt user for enter label,a b, and c
        System.out.println("Enter label and axes a, b, c for an ellipsoid. ");
        System.out.print("label: ");
        String label = input.nextLine();
        System.out.print("a: ");
        double a  = Double.parseDouble(input.next());
        if(!ellipsoid1.setA(a))
        {
            System.err.println("Error: axes value must be positive.");
            System.exit(0);
        }
        System.out.print("b: ");
        double b =  Double.parseDouble(input.next());
        if(!ellipsoid1.setB(b))
        {
            System.err.println("Error: axes value must be positive.");
            System.exit(0);
        }
        System.out.print("c: ");
        double c =  Double.parseDouble(input.next());
        if(!ellipsoid1.setC(c))
        {
            System.err.println("Error: axes value must be positive.");
            System.exit(0);
        }
        ellipsoid1 = new Ellipsoid(label,a,b,c);

            System.out.println("\n"+ellipsoid1);
    }
}

//Output

"C:\Program Files\Java jdk1.8.0_221\bin\java.exe" ... Enter label and axes a, b, c for an ellipsoid. label: Ex | a: 1.8 b: 2.0 C: 3.0 Ellipsoid "Ex 1" with axes a = 1.0, b = 2.0, c = 3.0 units has: volume = 25.1327 square units surface area = 48.9366 cubic units Process finished with exit code a

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