max - using scanner class to average numbers in java -

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i using scanner class average numbers together. using method averaging. not want program run if there more 20 args. cant seem work. new @ java , trying learn.

i appreciate can get. thanks! 

import java.util.scanner;  class programtwo {       public static void main (string[] args) {          scanner scan = new scanner(system.in);         double x = 0.00d;          if (args != null) {             system.out.println ("enter numbers averaged. remember no more 20!:");             x = scan.nextint();              if (x <= 21) {                 system.out.println("please not add more 20 numbers");                }          } else {        }      }      public double average(double [] values) {         double average = 0.0;         if ((values != null) && (values.length > 0)) {             (double value : values) {                 average += value;             }         average /= values.length;          }         return average;     }  }

here solution (cleaning lot of code well) gets numbers on 1 line after start of program:

import java.util.scanner;  class programtwo {       public static void main (string[] args) {          scanner scan = new scanner(system.in);         double values[] = new double[20];         int count = 0;         system.out.println ("enter numbers averaged. remember no more 20!:");         string inputs = scan.nextline();         scan = new scanner(inputs); // create new scanner out of our single line of input         while(scan.hasnextdouble())         {             if(count == 20)             {                 system.out.println("you entered many numbers! fail.");                 return;             }             values[count] = scan.nextdouble();             count += 1;         }          system.out.println("your average is: " + average(values, count));     }      public static double average(double [] values, int count) {         double average = 0.0;         (double value : values) {             average += value;         }         average /= count;          return average;     }  }

i got thinking might want use args passed main, since use null check, want run program this:

java programtwo num1 num2 num3 num4 num5

etc. if that's case, have solution:

class programtwo {       public static void main (string[] args) {         if(args.length > 20)         {             system.out.println("you entered many numbers! fail.");             return;         }         double values[] = new double[args.length];         for(int i=0; i< args.length; ++i)             values[i] = double.valueof(args[i]);          system.out.println("your average is: " + average(values));     }      public static double average(double [] values) {         double average = 0.0;         (double value : values) {             average += value;         }         average /= values.length;          return average;     }  }

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