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easy java question, constructor not defined

DJ_AM_Juicebox
on
Medium Priority
240 Views
Last Modified: 2010-03-31
Hi everyone,

easy question coming from c++... my java compiler (net beans) says I have an error using the constructor of CPerson in the last line of main():

    public static void main(String[] args)
    {
        // My linked list container.
        CLinkedList list;

        // Add a node.
        list.AddNode(
            CPerson("Joe", "111-222-3333", "some street"));
    }

It looks like it's saying that constructor method is not defined, but declaring a CPerson like this:

     CPerson person;

is ok. This is how I defined CPerson though:

    public class CPerson {
   
        /** Creates a new instance of CPerson */
        public CPerson()
        {
        }
        public CPerson(String strName,
                       String strPhoneNumber,
                       String strAddress)
        {
            m_strName = strName;
            m_strPhoneNumber = strPhoneNumber;
            m_strAddress = strAddress;
        }
    }

I must be something really simple. Why can't I use the constructor like that?

Thanks
Comment
Watch Question

>>"        public CPerson(String strName,
                       String strPhoneNumber,
                       String strAddress)
        {
            m_strName = strName;
            m_strPhoneNumber = strPhoneNumber;
            m_strAddress = strAddress;
        }"

You do not define any m_strName, m_strPhoneNumber and m_strAddress.

    public class CPerson {
        private String m_strName;
        private String m_strPhoneNumber;
        private String m_strAddress;

        /** Creates a new instance of CPerson */
        public CPerson()
        {
        }
        public CPerson(String strName,
                       String strPhoneNumber,
                       String strAddress)
        {
            m_strName = strName;
            m_strPhoneNumber = strPhoneNumber;
            m_strAddress = strAddress;
        }
    }


Then......

        // Add a node.
        list.AddNode(
            CPerson("Joe", "111-222-3333", "some street"));

Where is the keyword "new"?
For example,

CPerson test = new CPerson("Joe", "111-222-3333", "some street");

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Then,

You also need to define the getter and setter (I think that this is also present in C++) so you should know about it :)

David
CERTIFIED EXPERT
Top Expert 2016

Commented:
>>list.AddNode(CPerson("Joe", "111-222-3333", "some street"));


should be

list.AddNode(new CPerson("Joe", "111-222-3333", "some street"));
Mick BarryJava Developer
CERTIFIED EXPERT
Top Expert 2010

Commented:
> should be
> list.AddNode(new CPerson("Joe", "111-222-3333", "some street"));


thats already been pointed out
CERTIFIED EXPERT
Top Expert 2016

Commented:
Missed it
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Top Expert 2016

Commented:
Sorry suprapto45
Mick BarryJava Developer
CERTIFIED EXPERT
Top Expert 2010

Commented:
you are meant to actually *read* all previous comments before posting :)

Author

Commented:
sorry I just posted a code snippet, I do have all the member variables defined, it was just that I was not using the new operator.

Why do we need to use the new operator in java for this example? Is it not possible to create class objects on the stack like that?

Thanks
CERTIFIED EXPERT
Top Expert 2016

Commented:
>>Is it not possible to create class objects on the stack like that?

No, Java objects are created using new on the heap. There are static classes though and classes with static methods

http://mindprod.com/jgloss/static.html
Just be able to get online again.

Glad I could help :).

>>"Sorry suprapto45"
Not a problem at all. We all are just trying to help here.

David
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