Write a simple command line Java program to model our solar system<?xml:namespac

Question

Write a simple command line Java program to model our solar system<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Mercury, 0 moons                                                               

Venus 0 moons

Earth 1 moon

Mars 2 moons

Jupiter 67 moons

Saturn 62 moons

Uranus 27 moons

Neptune 13 moons

Pluto 5 moons

To complete this project you will need to create 3 separate java class files:

A Planet Class: this file is should be a class that contains 2 private attributes or properties. The first attribute should be for the name and the second a number for the number of moons that the planet has. The class should have a parameterized constructor, %u201Csetters and getters%u201D, and finally a %u201CtoString%u201D method that returns the name and the number of moons.

A Solar System Class: this file should be a class file with a single private attribute. The attribute should be an array of planets. The class should have a parameterized constructor that accepts a number for the size of the solar system ( the number of planets ). Include accessor methods that allow the setting of planets in the array and also a method that allows us to retrieve a planet by its position within the solar system. Additionally include methods that return the number of planets in the solar system and the total number of moons.

A Driver Class: this file should contain a main method that instantiates the solar system and planets and position the planet objects within the solar system object. Then, via a simple loop, print out each of the planets and their respective moons. Finally print out the total of the moons within the entire solar system.

Note: Only the Driver class should have a main method. Additionally there is no need for user interaction with this program (Scanner or argc). All of the planet data is hard-coded into the driver class.

Explanation / Answer

import java.io.*;

//PLANET CLASS

class Planet

{

private String name;

private int moons;

public Planet(String n,int num)

{

name=n;

moons=num;

}

public void setName(String n)

{ name=n; }

public void setMoons(int num)

{ moons=num; }

public String getName()

{ return name; }

public int getMoons()

{ return moons; }

public String toString()

{ return(name+" "+moons+" moons"); }

}

//SOLAR SYSTEM CLASS

class SolarSystem

{

private Planet planets[];

public SolarSystem(int size)

{ planets=new Planet[size]; }

public void setPlanet(int i,Planet p)

{ planets[i-1]=p; }

public Planet getPlanet(int i)

{ return planets[i-1]; }

public int numberOfPlanets()

{ return planets.length; }

public int totalMoons()

{ int sum=0;

for(int i=0;i<planets.length;i++)

sum=sum+planets[i].getMoons();

return sum;

}

}

//DRIVER CLASS

class Driver

{

public static void main(String args[])

{

SolarSystem S=new SolarSystem(9);

S.setPlanet(1,new Planet("Mercury",0));

S.setPlanet(2,new Planet("Venus",0));

S.setPlanet(3,new Planet("Earth",1));

S.setPlanet(4,new Planet("Mars",2));

S.setPlanet(5,new Planet("Jupiter",67));

S.setPlanet(6,new Planet("Saturn",62));

S.setPlanet(7,new Planet("Uranus",27));

S.setPlanet(8,new Planet("Neptune",13));

S.setPlanet(9,new Planet("Pluto",5));

for(int i=0;i<S.numberOfPlanets();i++)

System.out.println(S.getPlanet(i+1));

System.out.println("Total number of moons: "+S.totalMoons());

}

}

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