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Programming Fundamentals/Object Examples Java
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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