Programming Fundamentals/Object Examples Java

Objects

 // This program creates instances of the Temperature class to convert Celsius 
 // and Fahrenheit temperatures.
 //
 // References:
 //     https://www.mathsisfun.com/temperature-conversion.html
 //     https://en.wikibooks.org/wiki/Java_Programming
 
 import java.util.*;
 
 class Main {
     public static void main(String[] args) {
         Temperature temp1 = new Temperature();
         temp1.setCelsius(100.0);
         System.out.println("temp1.celsius = " + temp1.getCelsius().toString());
         System.out.println("temp1.fahrenheit = " + temp1.getFahrenheit().toString());
         System.out.println("");
         
         Temperature temp2 = new Temperature();
         temp2.setFahrenheit(100.0);
         System.out.println("temp2.fahrenheit = " + temp2.getFahrenheit().toString());
         System.out.println("temp2.celsius = " + temp2.getCelsius().toString());
     }
 }
 
 // This class converts temperature between Celsius and Fahrenheit.
 // It may be used by assigning a value to either Celsius or Fahrenheit 
 // and then retrieving the other value, or by calling the ToCelsius or
 // ToFahrenheit methods directly.
 
 class Temperature {
     Double celsius;
     Double fahrenheit;
 
     public Double getCelsius() {
         return celsius;
     }
     
     public void setCelsius(Double value) {
         celsius = value;
         fahrenheit = toFahrenheit(celsius);
     }
 
     public Double getFahrenheit() {
         return fahrenheit;
     }
     
     public void setFahrenheit(Double value) {
         fahrenheit = value;
         celsius = toCelsius(fahrenheit);
     }
 
     public Double toCelsius(Double fahrenheit) {
         return (fahrenheit - 32) * 5 / 9;
     }
     
     public Double toFahrenheit(Double celsius) {
         return celsius * 9 / 5 + 32;
     }
 }

Output

temp1.celsius = 100.0
temp1.fahrenheit = 212.0

temp2.fahrenheit = 100.0
temp2.celsius = 37.77777777777778

References

• Wikiversity: Computer Programming

Programming Fundamentals