问错误:无法找到或加载主类(netbeans和java)

EN

public class Weather
{
    public static void main(String[] arguments)
    {
        float fah = 86;
        System.out.println(fah + " degrees Fahrenheit is ...");
        //To conver fahrenheit to Celsius
        //Begin by subtracting 32
        fah = fah - 32;
        //divide the answer by 9
        fah = fah / 9;
        //multiply that answer by 5
        fah = fah * 5;
        System.out.println(fah + "degree Celsius is ...");

        float cel = 32;
        System.out.println(cel + "degress Celsius is ...");
        //To convert Farhenheit to celsius
        //begin by multiplying 9
        cel = cel * 9;
        //divide answer by 5
        cel =cel / 5;
        //add 32 to the answer
        cel = cel + 32;
        System.out.println(cel + "degrees Farenheit");

        }
}

run:
Error: Could not find or load main class weather.Weather
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)