non-static method from static method

hello.java

package com.example.helloworld;

public class HelloWorld
{

    public void sayHelloFromFile(){
        FileResource resource = new FileResource("hello_unicode.txt");
        for(String line : resource.lines()){
            System.out.println(line);
        }
    }

    public static void main(String[] args) {
        HelloWorld hw = new HelloWorld();
        hw.sayHelloFromFile();
    }
}