java - Syntax error on token "(", ; expected Syntax error on token ",", ; expected Syntax error on token ")", ; expected -

i working on project test out eclipse ide java developers. new @ java want know why isn't working because know do. here code:

public class eclipse {  public static double main(string[] args) {     // todo auto-generated method stub     final double average(double number, double number2)     {         double number3 = (number + number2)/2;                 return number3;     }     final double suk(double number4, double number5)     {         double number6 = number4 + number5;         return number6;     }     final double differenck(double number7, double number8)     {         double number9 = number7 - number8;         return number9;     }     final double produck(double number10, double number11)     {         double number12 = number10*number11;         return number12;     }   }  } 

here error comes up:

exception in thread "main" java.lang.error: unresolved compilation problems:  syntax error on token "(", ; expected syntax error on token ",", ; expected syntax error on token ")", ; expected void methods cannot return value syntax error on token "(", ; expected syntax error on token ",", ; expected syntax error on token ")", ; expected void methods cannot return value syntax error on token "(", ; expected syntax error on token ",", ; expected syntax error on token ")", ; expected void methods cannot return value syntax error on token "(", ; expected syntax error on token ",", ; expected syntax error on token ")", ; expected void methods cannot return value 

you writing methods in main method.please remove methods main method

public static void main(string[] args) {      //do    }    final double average(double number, double number2)     {         double number3 = (number + number2)/2;            return number3;     }     final double suk(double number4, double number5)     {         double number6 = number4 + number5;         return number6;     }     final double differenck(double number7, double number8)     {         double number9 = number7 - number8;         return number9;     }     final double produck(double number10, double number11)     {         double number12 = number10*number11;         return number12;     } 

and return type of main method should void