Please explan this program(methods)

Question

public class Strange {
public static void main(String[]args) {
first();
third();
second();
third();
}
public static void first() {
System.out.println("1.");
}
public static void second() {
System.out.println("2.");
first();
}
public static void third(){
System.out.println("3.");
first();
second();

}
}

Answer 1

The main method calls three different other methods, one of them twice. These other methods output strings containing numbers. Two of these methods also invoke other methods already referred to.