Java

The Java Tutorial - What Is an Interface?[^]

9-Dec-14 6:11

You can find the answer quite easily by looking at any online documentation, that Google will find for you, See http://www.codeproject.com/Messages/3137511/Forum-Guidelines-PLEASE-READ.aspx[^].

Re: java

TorstenH.11-Dec-14 22:14

TorstenH.

11-Dec-14 22:14

regards Torsten
I never finish anyth...

Passing JTextField Values to MouseListener Interface

Django_Untaken2-Dec-14 3:37

Django_Untaken

2-Dec-14 3:37

Hello. I am implementing action event in a class 1, database handling in class 2 while all the controls are instantiated in a 3rd class. Heirarchy becomes like this.

Java

// class for interacting with the database
class MyDatabase
{
  // add, update and delete functions here
}

// class for handling events
class ActionHandler implements ActionListener
{
  MyDatabase db = null;
  View m_View = null;

  public ActionHandler(View view)
  {
    m_View = view;
    db = new MyDatabase();    
  }
  public void actionPerformed(ActionEvent ae){
    if(ae.getSource() == MyView.AddButton) // HOW DI I GET VALUES HERE ???
      db.AddRecord();
  }
}

// class for making simple GUI for 3 JTextFields and 3 JButtons (add, update, delete)
class View
{
  ActionHandler action_handler = null;
  public View()
  {
    action_handler = new ActionHandler(this);
    // all the controls are created in this constructor.
    
    AddButton.addActionListener(action_handler);
  }
}

Question is: how do I pass my JTextField values from View class to ActionHandler class ? I don't think passing these values in the constructor of ActionHandler is good idea.

Re: Passing JTextField Values to MouseListener Interface

Richard MacCutchan2-Dec-14 5:27

Re: Passing JTextField Values to MouseListener Interface

2-Dec-14 5:27

You have a reference to the View object in your ActionHandler so you can access the view's properties and methods from there. Although I am not sure where MyView.AddButton fits in with the rest of your code.

Django_Untaken3-Dec-14 5:52

Django_Untaken

3-Dec-14 5:52

YESSS. Thanks. One more question: along with View class object if I pass an object of MyDatabase in ActionListener constrcutor as well...like this

Java

class ActionListenderHandler implements ActionListener
{
  MyDatabse MyDB = null; View myView;
  public ActionListenerHandler(View view, MyDatabase db)
  {
    myView = view;
    MyDB = db;
  }
}
class View
{
  MyDatabase db = null;
  public View()
  {
    db = new MyDatabase("..."); 
    actionListener = new ActionListenerHandler(this, db)

    //.....
    db.CloseConnection();
  }
}

After calling db.CloseConnection in View class, do I have to call myDB.CloseConnection in ActionListener class explicitly ? Thanks

Re: Passing JTextField Values to MouseListener Interface

Richard MacCutchan3-Dec-14 6:26

Authentication and Encryption

3-Dec-14 6:26

No, because MyDB in the ActionListenderHandler and db in the View, both refer to the same object, just by different names, as shown by the line of code:

Java

MyDB = db;

Anele Ngqandu2-Dec-14 2:26

2-Dec-14 2:26

Hello

I am experimenting with java, I need a tutorial that will help me with creating rights,since different roles will not have access to same areas of the application.
Also what is the best way to encrypt passwords?

Looking forward to your replies.
Thanks Thumbs Up | :thumbsup:

Act as though it were impossible to fail

Richard Deeming2-Dec-14 2:38

2-Dec-14 2:38

Anele Ngqandu wrote:
Also what is the best way to encrypt passwords?

You don't - you store a salted hash of the password.
Salted Password Hashing - Doing it Right[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Anele Ngqandu2-Dec-14 2:44

2-Dec-14 2:44

Thank you Sir

Act as though it were impossible to fail

ZurdoDev2-Dec-14 2:41

ZurdoDev

2-Dec-14 2:41

Anele Ngqandu wrote:
Also what is the best way to encrypt passwords?

Just google for examples of encryption in java and you should find lots of examples.

Also, it is recommended that a password be hashed, as Richard mentions, and then store the hash but there are times where encryption is needed.

There are only 10 types of people in the world, those who understand binary and those who don't.

Anele Ngqandu2-Dec-14 2:45

2-Dec-14 2:45

Act as though it were impossible to fail

Richard Deeming2-Dec-14 2:48

2-Dec-14 2:48

RyanDev wrote:
there are times where encryption is needed.

I can think of two, and "authenticating users" isn't one of them. Smile | :)

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Anele Ngqandu2-Dec-14 2:53

2-Dec-14 2:53

what are those 2?

Act as though it were impossible to fail

Richard Deeming2-Dec-14 3:04

2-Dec-14 3:04

You need to store a password to access an external system or service;
You're writing your own password manager, and need to be able to see the original password;

For the simple case of "validate that the user entered the correct password", encryption is only slightly better than plain text.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

ZurdoDev2-Dec-14 2:54

ZurdoDev

2-Dec-14 2:54

Richard Deeming wrote:
and "authenticating users" isn't one of them.

Actually, I've had to do this before. I agree it is not ideal but when interfacing with other systems, sometimes you have to do it this way.

There are only 10 types of people in the world, those who understand binary and those who don't.

Richard Deeming2-Dec-14 2:59

2-Dec-14 2:59

"Authenticating to a remote system" was one of the cases I was thinking of. I was just trying to keep it separate from "validating that the user entered the correct password".

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Anele Ngqandu2-Dec-14 3:02

Re: Web log preprocessing

2-Dec-14 3:02

Ahh I see!!Cool thank you Thumbs Up | :thumbsup:

Act as though it were impossible to fail

Web log preprocessing

Member 107226751-Dec-14 18:39

Member 10722675

1-Dec-14 18:39

Hi...i am very new to data mining,am working on web usage mining currently.can any one suggest me how do i preprocess the web server log file...i am using java programming language...

Richard MacCutchan1-Dec-14 22:16

How to correctly use the interceptor encrypt all address

1-Dec-14 22:16

Please read http://www.codeproject.com/Messages/3137511/Forum-Guidelines-PLEASE-READ.aspx[^]; your question is far too general to be answered in a technical forum.

Member 1127235628-Nov-14 16:13

Member 11272356

28-Nov-14 16:13

How to use the interceptor to encrypt and decrypt all the get or post request encryption address bar (browser address)

James Cui

Re: How to correctly use the interceptor encrypt all address

Richard MacCutchan28-Nov-14 22:36