public class MainClass {
	// main is the entry point of the program
	public static void main(String[] args) {
		Person p;
		// to create an object of type Person
		// (to instantiate the Person class),
		// call the class constructor
		p = new Person();

		// Person() is the default constructor
		// automatically available if no other
		// constructor has been written.
		p.speak();
		
		// Create a person with a given name and age
		Person p2 = new Person("Do", 25);
		p2.speak();
	}
}