osx - How do I get console input for a java program in Terminal on Mac? -

i'm trying create simple program converts degrees in fahrenheit degrees in celcius on mac through terminal application , using vi editor.

my code follows:

import java.io.*;  public class mythirdjavaprogram { public static void main (string [] args)     {     double celcius, fahrenheit;     fahrenheit = console.readdouble("fahrenheit");     celcius = convertfahrenheittocelcius(fahrenheit);     system.out.println("degrees in celcius " + celcius);     }  private static double convertfahrenheittocelcius (double ins)     {     double celcius;     celcius = ((ins-32.0)*5.0)/9.0;     return celcius;     } } 

the error keep getting is:

mythirdjavaprogram.java:7: cannot find symbol symbol  : method readdouble(java.lang.string) location: class java.io.console fahrenheit = console.readdouble("fahrenheit");                     ^ 

what doing wrong here? i've tried lot of different ways code such as

fahrenheit = console.in.readdouble(fahrenheit) 

and

fahrenheit = system.console.readdouble(fahrenheit) 

but absolutely nothing works , error statement same every time. i'm new java confusing heck out of me. solves dang thing awesome, if tell me re-write half of it.

there no method readdouble(string) in console api. please use java.util.scanner. example scanner.nextdouble()