TemperatureConverter.java

import java.util.Scanner;

// Abstract class Temperature
abstract class Temperature {
 protected double temp;
 
 // Method to set temperature data
 public void setTempData(double temp) {
 this.temp = temp;
 }
 
 // Abstract method to be implemented by subclasses
 abstract void changeTemp();
}

// Fahrenheit class to convert to Celsius
class Fahrenheit extends Temperature {
 private double ctemp; // Celsius temperature
 
 @Override
 void changeTemp() {
 // Convert Fahrenheit to Celsius: C = 5/9 * (F - 32)
 ctemp = 5.0 / 9.0 * (temp - 32);
 System.out.printf("%.2f°F = %.2f°C\n", temp, ctemp);
 }
}

// Celsius class to convert to Fahrenheit
class Celsius extends Temperature {
 private double ftemp; // Fahrenheit temperature
 
 @Override
 void changeTemp() {
 // Convert Celsius to Fahrenheit: F = 9/5 * C + 32
 ftemp = 9.0 / 5.0 * temp + 32;
 System.out.printf("%.2f°C = %.2f°F\n", temp, ftemp);
 }
}

public class TemperatureConverter {
 public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
 
 System.out.println("Temperature Converter");
 System.out.println("--------------------");
 
 // Create Fahrenheit to Celsius converter
 Fahrenheit fahrenheit = new Fahrenheit();
 System.out.print("Enter temperature in Fahrenheit: ");
 double fTemp = scanner.nextDouble();
 fahrenheit.setTempData(fTemp);
 fahrenheit.changeTemp();
 
 // Create Celsius to Fahrenheit converter
 Celsius celsius = new Celsius();
 System.out.print("Enter temperature in Celsius: ");
 double cTemp = scanner.nextDouble();
 celsius.setTempData(cTemp);
 celsius.changeTemp();
 
 scanner.close();
 }
}