package ru.job4j;

public class Calculate {
public static void main(String[] args) {

		System.out.println("Hello world.");
	}
}

package ru.job4j;

/**
*Class Calculate для вывода на экран информации
*@author zhigulin
*@since 15.12.2016
*/

public class Calculate {
	public static void main(String[] args) {

		System.out.println("Hello world.");
	}
}

Update Calculate.java