package ru.sbulygin;

/**
* Colculate class.
* @author sbulygin.
* @since 10.11.2016.
* @version 1.0.
*/
public class Calculate {
     /**
     * Main.
     * @param args do not use.
     */
     public static void main(String[] args) {
         System.out.print("Hello World");
  }
 }
package ru.sbulygin;

/**
* Colculate class.
* @author sbulygin.
* @since 10.11.2016.
* @version 1.0.
*/
public class Calculate {
     /**
     * Main.
     * @param args do not use.
     */
     public static void main(String[] args) {
         String sep = System.getProperty("line.separator");
        System.out.printf("Hello World!%s", sep);
  }
 }
correct file