Question

Create a program that the simulates a thermometer and displays its temperature using different units.

1- Temperature Interface (Temperature.java)
This interface should declare the following two abstract methods:

• getTemperature

     o Returns a String o Accepts no arguments

• setTemperature

     o Returns void o Accepts one double argument

2- Abstract Thermometer Class (Thermometer.java)
This abstract class must implement the Temperature interface and contain:

• One private field (a double) named degrees

• One constructor that accepts a double argument to set the degrees field

• A getter and setter for the degrees field

• An abstract method named convert

       o Accepts no arguments o Returns a String.

3- FahrenheitThermometer Class (FahrenheitThermometer.java)
This class must be a subclass of Thermometer and include:

• No fields

• One constructor that accepts a double argument to set the degrees field in the superclass.

• An implementation of the getTemperature method (required by the abstract superclass’s interface)

           o Returns a String that is the degrees F o For example, 45.7 F (if the superclass’s degrees field was 45.7)

• An implementation of the setTemperature method (required by the abstract superclass’s interface)

            o Simply sets the superclass’s degrees field

• An implementation of the convert method (required by the abstract superclass)

          o Returns the temperature in Celsius

▪ Degrees Celsius = (Degrees Fahrenheit - 32) * (5/9) o Returns a String that is the degrees C o For example, 7.6 C (if the superclass’s degrees field was 45.7)

4- CelsiusThermometer Class (CelsiusThermometer.java)
This class must be a subclass of Thermometer and include:

• No fields

• One constructor that accepts a double argument to set the degrees field in the superclass.

• An implementation of the getTemperature method (required by the interface)

              o Returns a String that is the degrees C o For example, 62.8 C (if the superclass’s degrees field was 62.8)

• An implementation of the setTemperature method (required by the interface)

              o Simply sets the superclass’s degrees field

• An implementation of the convert method (required by the abstract superclass)

             o Returns the temperature in Fahrenheit

▪ Degrees Fahrenheit = (Degrees Celsius * (9/5)) + 32 o Returns a String that is the degrees F o For example, 145.04 F (if the superclass’s degrees field was 62.8)

5- Thermometer Application (ThermoApp.java)
In the main method:

• Prompt the user to choose either Fahrenheit or Celsius. o You may implement this as the user entering “1 or 2”, “F or C”, etc.

• Prompt the user to enter the degrees.

• Instantiate either a FahrenheitThermometer or CelsiusThermometer object (based on the user’s choice) and assign it to the Thermometer variable that has been declared for you.

              o For example: therm = new FahrenheitTemperature(degrees);

• Uncomment the two lines that pass the Thermometer variable to the displayTemperature and displayConversion methods.

Sample Input/Output

Choose Fahrenheit (F) or Celsius (C): F

Enter the degrees: 89.5

The temperature is 89.5 F

The temperature converted is 31.9 C

Answer 1

public interface Temperature {
   String getTemperature();
   void setTemperature(double temperature);
}

public abstract class Thermometer implements Temperature{
   private double degrees;
   public Thermometer(double degrees){
       this.degrees=degrees;
   }
   public double getDegrees() {
       return degrees;
   }
   public void setDegrees(double degrees) {
       this.degrees = degrees;
   }
   public abstract String convert();
}

public class FahrenheitThermometer extends Thermometer{

   public FahrenheitThermometer(double degrees) {
       super(degrees);
   }

   @Override
   public String getTemperature() {
       // TODO Auto-generated method stub
       return this.getDegrees()+"F";
   }

   @Override
   public void setTemperature(double temperature) {
       // TODO Auto-generated method stub
       this.setDegrees(temperature);
   }

   @Override
   public String convert() {
       // TODO Auto-generated method stub
       return Math.round(((this.getDegrees()-32)*((double)5/9))*10)/10.0+"C";
   }
  

}

public class CelsiusThermometer extends Thermometer{

   public CelsiusThermometer(double degrees) {
       super(degrees);
   }

   @Override
   public String getTemperature() {
       // TODO Auto-generated method stub
       return this.getDegrees()+"C";
   }

   @Override
   public void setTemperature(double temperature) {
       // TODO Auto-generated method stub
       this.setDegrees(temperature);
   }

   @Override
   public String convert() {
       // TODO Auto-generated method stub
       return Math.round(((this.getDegrees()*((double)9/5))+32)*10)/10.0+"F";
   }

}

import java.util.Scanner;

public class ThermoApp {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner sc=new Scanner(System.in);
       System.out.println("Choose Fahrenheit (F) or Celsius (C):");
       String inp=sc.nextLine();
       Thermometer therm=null;
       System.out.println("Enter the degrees:");
       double degrees=sc.nextDouble();
       if(inp.equalsIgnoreCase("F")){
           therm=new FahrenheitThermometer(degrees);
       }
       else{
           if(inp.equalsIgnoreCase("C")){
               therm=new CelsiusThermometer(degrees);
           }
       }
       System.out.println("The temperature is "+therm.getTemperature());
       System.out.println("The temperature converted is "+therm.convert());
   }

}
Expected output: