java basic - print hello world

(1) Main.java

public class Main {
	public static void main(String[] args) { System.out.println("Hello world!"); }
}

 

(2) src > New > Package > study_day1 > New > Java Class > _HelloWorld.java

pacage study_day1;

public class _HelloWorld {
	public static void main(String[] args) {
    	System.out.println("Hello World!");
    }
}