Convert Fahrenheit temperature to Celsius and Kelvin.

[weixin_52389260]

输出的结果与手算的结果不一致，不知道是哪里出现了错误。向各位大神们求助！

import java.text.DecimalFormat;
import java.util.Scanner;

class Temperature {
    private static double fTemp;
    Temperature(){
        double fTemp;
    }
    //Create one field
    public static void main(String[] args) {
        double fTemp;
    }
    //A method named toCelsius that returns the temperature (value of fTemp) in Celsius
    public static double toCelsius(){
        DecimalFormat df = new DecimalFormat("0.00");
        String a = df.format((double) 5/9);
        double b = Double.parseDouble(a);
        double result = (fTemp - 32) * b;
        return result;
    }

    //A method named toKelvin that returns the temperature (value of fTemp) in Kelvin
    public static Double toKelvin(){
        DecimalFormat df = new DecimalFormat("0.00");
        String a = df.format((double) 5/9);
        double b = Double.parseDouble(a);
        double result = (fTemp + 459.67) * b;
        return result;
    }
}

class TemperatureDemo {
    public static void main(String[] args) {

        Temperature demo = new Temperature();
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Please enter the Fahrenheit temperature: ");
        double fTemp = Double.parseDouble(keyboard.nextLine());

        //Convert input temperature to be rounded to 2 decimal places.
        DecimalFormat df = new DecimalFormat("#.00");

        System.out.print("Celsius Temperature: ");
        //Print the temperature in Celsius using the toCelsius method of Temperature object
        System.out.println(df. format(Temperature.toCelsius()));

        System.out.print("Kelvin Temperature: ");
        //Print the temperature in Kelvin using the toKelvin method of Temperature object
        System.out.println(df. format(Temperature.toKelvin()));
    }
}

下面是要求

引用

Temperature Class (Temperature.java)
• One field, a double, named fTemp. • One constructor that accepts one argument.
o The constructor should assign the value of this argument to fTemp. • A method named toCelsius that returns the temperature (value of fTemp) in Celsius.
F to C conversion: (fTemp - 32) * (5/9)
• A method named toKelvin that returns the temperature (value of fTemp) in Kelvin.
F to K conversion: (fTemp + 459.67) * (5/9)
• Neither the toCelsius or toKelvin methods should alter the value of the fTemp field.
TemperatureDemo Class (TemperatureDemo.java)
This is the class that will demo a Temperature object; thus, it contains the main method.
In the main method:
• Prompt the user to enter a temperature in Fahrenheit.
• Construct an instance of your Temperature object
o The user’s input value is passed as the argument to the constructor
• Using the Temperature object's toCelsius, and toKelvin methods, print:
o The temperature in Celsius.
o The temperature in Kelvin.
o All output should be rounded to 2 decimal places.

引用

Sample Input/Output
Please enter the Fahrenheit temperature: 98.6
Celsius Temperature: 37.00
Kelvin Temperature: 310.15