Java Programming for Beginners

Creating constructors

In this section, you're going to learn about a very special member we can assign to our custom classes, that is, the constructor. To start off, let's take a look at the following code:

package gettingobjectoriented; 
 
import java.util.*; 
 
public class GettingObjectOriented { 
    public static void main(String[] args) { 
        Scanner reader = new Scanner(System.in); 
        Person john = new Person(); 
        john.firstName = "John"; 
        john.lastName = "Doe"; 
        john.birthday = new GregorianCalendar(1988,1,5); 
        System.out.println( 
            "Hello my name is " +            
            john.fullName() + 
            ". I am " + 
            john.age(new GregorianCalendar()) + 
            " years old."); 
    } 
} 

This program creates an instance of our custom class Person and immediately assigns some values to member variables of ...