Question

Hi all! Looking for good explanations as to how this problem is solved without the constructor.

1. In this problem, we will write and use a static class (remember static classes do not operate on an object.) Your weight is actually the amount of gravitational attraction exerted on you by the

Earth. Since the Moon’s gravity is only one-sixth of the Earth’s gravity, on the Moon you would weigh only one-sixth of the Earth’s gravity. Write an application that inputs the user’s Earth weight as an integer and outputs her/his weight on the Moon, Mercury, Venus, Jupiter or Saturn. Use the values from this table.

Planet/Moon	Multiply the Earth Weight by
Moon	0.1666
Mercury	0.4
Venus	0.9
Jupiter	2.5
Saturn	1.1

• You will have a tester class and a planet weight calculation class.

• Create a static class for planet weight calculation. (A class is considered static if all of its

  methods are static.)

o Youdonotwriteaconstructor(thinkaboutwhy).
o Write a different method for each of the planets. Each method will accept as input the

“earth” weight. It will return the calculated planet weight. Each method should multiply the “earth” weight supplied as an argument by corresponding planet conversion factor to get the equivalent “planet” weight.

o Use constants for your weight conversion factors (the table, above). • Create a tester class

o Get user input with a scanner object
o Ask the user to enter the “earth” weight.
o Call each of the methods in the static class and print the results.

Answer 1

SOLUTION-
I have solve the problem in Java code with comments and screenshot for easy understanding :)

CODE-

PlanetWeight.java

//static class definition
public class PlanetWeight {
    //static function to calculate corresponding value on the planet
    public static double wieghtOnMoon(double weight){
        //returning calculated value on the planet
        return weight*0.1666;
    }
    //static function to calculate corresponding value on the planet
    public static double wieghtOnMercury(double weight){
        //returning calculated value on the planet
        return weight*0.4;
    }
    //static function to calculate corresponding value on the planet
    public static double wieghtOnVenus(double weight){
        //returning calculated value on the planet
        return weight*0.9;
    }
    //static function to calculate corresponding value on the planet
    public static double wieghtOnJupiter(double weight){
        //returning calculated value on the planet
        return weight*2.5;
    }
    //static function to calculate corresponding value on the planet
    public static double wieghtOnSaturn(double weight){
        //returning calculated value on the planet
        return weight*1.1;
    }
}

-----------------------------------------------------

PlanetWeightTester.java

//importing required class
import java.util.Scanner;
//tester class definition
public class PlanetWeightTester {
    //defining main method
    public static void main(String[] args) {
        //creating scanner object to get user input
        Scanner input=new Scanner(System.in);
        //variable to store the intermediate values
        double weightOnEarth,weightOnPlanet;
        //asking user tot enter the weight
        System.out.print("Enter the weight on Earth: ");
        //storing the user input into the variable      
        weightOnEarth=input.nextFloat();
        //calling function to get corresponding weight on the planet
        weightOnPlanet=PlanetWeight.wieghtOnMoon(weightOnEarth);
        //printing the message for the user with calculated value
        System.out.println("Weight "+weightOnEarth+" on Earth is equal to "+weightOnPlanet+" on Moon");
        //calling function to get corresponding weight on the planet
        weightOnPlanet=PlanetWeight.wieghtOnMercury(weightOnEarth);
        //printing the message for the user with calculated value
        System.out.println("Weight "+weightOnEarth+" on Earth is equal to "+weightOnPlanet+" on Mercury");
        //calling function to get corresponding weight on the planet
        weightOnPlanet=PlanetWeight.wieghtOnVenus(weightOnEarth);
        //printing the message for the user with calculated value
        System.out.println("Weight "+weightOnEarth+" on Earth is equal to "+weightOnPlanet+" on Venus");
        //calling function to get corresponding weight on the planet
        weightOnPlanet=PlanetWeight.wieghtOnJupiter(weightOnEarth);
        //printing the message for the user with calculated value
        System.out.println("Weight "+weightOnEarth+" on Earth is equal to "+weightOnPlanet+" on Jupiter");
        //calling function to get corresponding weight on the planet
        weightOnPlanet=PlanetWeight.wieghtOnSaturn(weightOnEarth);
        //printing the message for the user with calculated value
        System.out.println("Weight "+weightOnEarth+" on Earth is equal to "+weightOnPlanet+" on Saturn");
    }
}

SCREENSHOT -

IF YOU HAVE ANY DOUBT PLEASE COMMENT DOWN BELOW I WILL SOLVE IT FOR YOU:)
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