Question

Can anybody please tell me what the Constructors are used for exactly in Java?

What could be the ideal condition for using the constructors in an application?

Thanks,
david

Answer 1

Constructors are very useful for initializing instance variables. For instance, say you have a User class, and you would like to initialize the userName property whenever you create a new instance:

Class User 
{
    String userName;      

    public User (String name)
    {
        userName = name;
    }
}

User oUser = new User("Mike");

Note – When you write your own constructor, java doesn’t provide a default constructor