27.9.5: Java Examples
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// 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; } }
temp1.celsius = 100.0 temp1.fahrenheit = 212.0 temp2.fahrenheit = 100.0 temp2.celsius = 37.77777777777778