Calling constructor twice?

[shaf maff]

Hi Guys

Is it possible to call a constructor twice? For example:

// -- constructor 1
public MyClass(int id, String name) {
this.id = id;
this.name = name;
}

// -- constructor 2
public MyClass(String username) {
this.username = username;
}


// -- servlet
MyClass class = new MyClass(2, john); // init first constructor
class(johny); // init second constructor

[Bear Bibeault]

Please take the time to choose the correct forum for your posts. This forum is for questions on Servlets.

For more information, please read this.

This post has been moved to a more appropriate forum.

[Campbell Ritchie]

You can call a constructor twice, if it is overloaded. This is how you might do it with a Clock, which is more-or-less the same as an example in the Deitel and Deitel books.

public class Clock
{
    private int hour;
    private int minute;
    private int second;

    public Clock()
    {
        this(0);
    }

    public Clock(int hr)
    {
        hour = hr;
        minute = 0;
        second = 0;
    }

    public Clock(int hr, int min)
    {
        this(hr, min, 0);
    }

    public Closk(int hour, int minute, int second)
    {
         this.hour = hour;
         this.minute = minute;
         this.second = second;
    }
 . . .
}

Flesh out that class, set up a class with a main method, and try it out.

I hope that answers your question. If you use the keyword this with () like that, it must be the first statement in the constructor.

As far as I know you cannot invoke a constructor on an already-extant object, as you seem to be doing. Nor can you call an object "class," because "class" is a keyword.

[Campbell Ritchie]

myself wrote:Flesh out that class, set up a class with a main method, and try it out.

Then find my spelling errors and correct them!