Question

Write a program in java (consists of three files) that uses class-objects to calculate temperature in Fahrenheit and Centigrade. That is, there are at least three classes. The problem is to write a three classes (3) that calculate the temperature either in Fahrenheit or Celsius. This action should be repeatable. This demonstrates use of a menu to give user a choice. Use of proper syntax for named constants, variables, reference variables, constructors, getter and setter and display methods is expected.

Algorithm(s) :

F = (XC x 1.8) + 32

C = (F – 32) / 1.8

Answer 1

We can do this conversion in single class itself or using inheritance concept. But as per mentioned question you are asking getters(), setters() all . so, for your understanding created three classes. Fahrenheit - convert temp to Fahrenheit same with centigrade & two driver program to use above mentioned functionality.

Fahrenheit.java

public class Fahrenheit { //class creation with public access modifier access everywhere

   public double convertTempToFahrenheit(double tempInCentigrade) //method definition
   {
       return (tempInCentigrade*1.8)+32; //conversion
   }

}

Centigrade.java

public class Centigrade {
  
  
   public double convertTempToCentigrate(double tempInFahrenheit) //method definition input fahrenheit
   {
       return (tempInFahrenheit-32)/1.8; //return fahrenheit -> centigrade convertion
   }

}

TempDriver.java

import java.util.Scanner;

public class TempDriver {
   double temp;
   public static void main(String ar[])
   {
       Scanner scannerObj=new Scanner(System.in); //scanner instance creation -- for user input
       TempDriver tempDriverObj=new TempDriver(); //instance creation all three classes
       Fahrenheit fahrenHeitObj=new Fahrenheit();
       Centigrade centigradeObj=new Centigrade();
       int userChoice;
       while(true) //Asking user n times
       {
           System.out.println("1. convertTempToCentigrade \t 2. convertTempToFahrenheit \t 3. EXIT"); //Menu display
           System.out.println("Enter Choice:");
           userChoice=scannerObj.nextInt(); //input user choice
           switch(userChoice)   
           {
           case 1:
           {
               System.out.println("Enter Temperature in Fahrenheit:"); //Asking user temp in Fahrenheit
               tempDriverObj.setTemp(scannerObj.nextDouble()); //setting method to set temp based on input
           double centiTemp   =centigradeObj.convertTempToCentigrate(tempDriverObj.getTemp()); //invoking method using object
               tempDriverObj.displayTempConvetion(tempDriverObj.getTemp(), centiTemp); //display temp after convertion
               break;
           }
           case 2:
      
           {
               System.out.println("Enter Temperature in Centigrade:");
               tempDriverObj.setTemp(scannerObj.nextDouble());
           double fahrenheitTemp   =fahrenHeitObj.convertTempToFahrenheit(tempDriverObj.getTemp());
               tempDriverObj.displayTempConvetion(fahrenheitTemp,tempDriverObj.getTemp());
               break;
          
           }
           case 3: //exit
               return;
          
           }
          
          
       }
   }
   public double getTemp() {
       return temp; //getter for temp
   }
   public void setTemp(double temp) { //setting provided value to temp
       this.temp = temp;
   }
   public void displayTempConvetion(double tempInFahrenheit,double tempInCenti)
   {
       System.out.println("\t\t -- Temp Convertion Details -- \t\t"); //displaying temp
       System.out.println("\t\t -- Temp in Fahrenheit :"+tempInFahrenheit);
       System.out.println("\t\t -- Temp in Centigrade :"+tempInCenti);
      
   }
}

Output: