Pros & cons of extending jframe or adding it

Hi i've written a class code that extends jframe (and is my main code for the application) now i see that many code examples (such as the divelog.java posted on java.sun) prefer adding a jframe to the class and .pack & .setvisible
beside code comfort (either way) is there a real reason to prefer one way over the other ?
thanks .

yes. always favour composition over inheritance. class inheritance is one of the most abused features of the language, I have to struggle with inappropriate use of it on a daily basis because we've got a team of morons who think it's ok to extend a class twelve times, just to change the order in which some buttons get displayed on-screen. that's not an exaggeration, at all
extend classes when the subclass really is an extension of the superclass, really is a kind-of JFrame or whatever. not just to re-use some methods and save some typing. hint: JFrame is a Container,which means it was intended to contain other UI objects. thus, by adding widgets to it, you are making use of it as intended, not making a new kind of JFrame

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Adding a JPanel from one class to another Class (which extends JFrame)

Hi everyone,
So hopefully I go about this right, and I can figure out what I'm doing wrong here. As an exercise, I'm trying to write a Tic-Tac-Toe (TTT) game. However, in the end it will be adaptable for different variations of TTT, so it's broken up some. I have a TTTGame.java, and TTTSquareFrame.java, and some others that aren't relavent.
So, TTTGame:import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import joshPack.jUtil.*;
public class TTTGame extends JFrame
     private Integer sides = 3;
     private TTTSquareFrame mainSquare;
     private TTTGame newGame;
     private Container contents;
     private JPanel mainSquarePanel, addPanel;
     public static void main(String [] args)
          TTTGame newGame = new TTTGame();
          newGame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public TTTGame()
          super("Tic-Tac-Toe");
          contents = getContentPane();
          contents.setLayout(new FlowLayout());
          addPanel = startSimple();
          if(!addPanel.isValid())
               System.out.println("Something's wrong");
          contents.add(addPanel);
          setSize(300, 300);
          setVisible(true);
     public JPanel startSimple()
          mainSquare = new TTTSquareFrame(sides);
          mainSquarePanel = mainSquare.createPanel(sides);
          return mainSquarePanel;
}and TTTSquareFrame:import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import joshPack.jUtil.Misc;
public class TTTSquareFrame
     private JPanel squarePanel;
     private JButton [] squares;
     private int square, index;
     public TTTSquareFrame()
          System.out.println("Use a constructor that passes an integer specifying the size of the square please.");
          System.exit(0);
     public TTTSquareFrame(int size)
     public JPanel createPanel(int size)
          square = (int)Math.pow(size, 2);
          squarePanel = new JPanel();
          squarePanel.setLayout(new GridLayout(3,3));
          squares = new JButton[square];
          System.out.println(MIN_SIZE.toString());
          for(int i = 0; i < square; i++)
               squares[i] = new JButton();
               squares.setRolloverEnabled(false);
               squares[i].addActionListener(bh);
               //squares[i].setMinimumSize(MIN_SIZE);
               squares[i].setVisible(true);
               squarePanel.add(squares[i]);
          squarePanel.setSize(100, 100);
          squarePanel.setVisible(true);
          return squarePanel;
}I've successfully added panels to JFrame within the same class, and this is the first time I'm modularizing the code this way. The issue is that the frame comes up blank, and I get the message "Something's wrong" and it says the addPanel is invalid. Originally, the panel creation was in the constructor for TTTSquareFrame, and I just added the mainSquare (from TTTGame class) to the content pane, when that didn't work, I tried going about it this way. Not exactly sure why I wouldn't be able to add the panel from another class, any help is greatly appreciated.
I did try and cut out code that wasn't needed, if it's still too much let me know and I can try and whittle it down more. Thanks.

Yea, sorry 'bout that, I just cut out the parts of the files that weren't relevant but forgot to compile it just to make sure I hadn't left any remnants of what I had removed. For whatever it's worth, I have no idea what changed, but something did and it is working now. Thanks for your help, maybe next time I'll post an actual question that doesn't somehow magically solve itself.
EDIT: Actually, sorry, I've got the panel working now, but it's tiny. I've set the minimum size, and I've set the size of the panel, so...why won't it respond to that? It almost looks like it's being compressed into the top of the panel, but I'm not sure why.
I've compressed the code into:
TTTGame.java:
import java.awt.*;
import javax.swing.*;
public class TTTGame extends JFrame
     private Integer sides = 3;
     private TTTSquareFrame mainSquare;
     private TTTGame newGame;
     private Container contents;
     private JPanel mainSquarePanel, addPanel;
     public static void main(String [] args)
          TTTGame newGame = new TTTGame();
          newGame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public TTTGame()
          super("Tic-Tac-Toe");
          contents = getContentPane();
          contents.setLayout(new FlowLayout());
          mainSquare = new TTTSquareFrame(sides.intValue());
          contents.add(mainSquare);
          setSize(400, 400);
          setVisible(true);
}TTTSquareFrame.java
import java.awt.*;
import javax.swing.*;
public class TTTSquareFrame extends JPanel
     private JButton [] squares;
     private int square, index;
     private final Dimension testSize = new Dimension(50, 50);
     public TTTSquareFrame(int size)
          super();
          square = (int)Math.pow(size, 2);
          super.setLayout(new GridLayout(size, size));
          squares = new JButton[square];
          for(int i = 0; i < square; i++)
               squares[i] = new JButton();
               squares.setMinimumSize(testSize);
               squares[i].setVisible(true);
               super.add(squares[i]);
          setSize(200, 200);
          setVisible(true);
I've made sure the buttons are smaller than the size of the panel, and the panel is smaller than the frame, so...
Message was edited by:
macman104

Pros & Cons of Using SAP PI Interfaces for Report Generation

Hi Guru's
I have a Scenario's like
I have to generate a customized report in SAP with the main data's available in SAP ECC and some required data available in the Legacy System.
I want to know the Pros & cons of using SAP PI RFC/Proxy adapter interface to get the data from the legacy system for each time the user execute the report in SAP ECC.
Thanks in Advance

There are couple of "dimensions" to consider in your PI interface design. For exemple when you are running the sizing exercise (Since we are considering adding a net new interface), you will need to capture specific information about new interface.i.e. S/A, adapters, frequency, avg payload size. etc..Note that the last two attributes will be hard to size properly in this case since you can't predict how frequent the end user will run the report which will impact the latency time required to pull the data. Latency will affect the user experience as visible side affect and definitely the SLA for other interfaces running at the same time.
On the other hand, the data you are trying to retrieve from the legacy won't be used for transactional purpose but for the end user to pull KPIs from the system which can affect ECC as well. You may end up doing lot hot fixes for your report (Assuming that the report is a medium complexity code)
There are other factors to consider but let's consider these are the major one.
Cheers,
F

Pros/Cons of replicating to files versus staging tables

I am new to GoldenGate and am trying to figure out pros/cons of replicating to flatfiles to be processed by an ETL tool versus replicating directly to staging tables. We are using GoldenGate to source data from multiple transaction systems to flatfiles and then using Informatica to load thousands of flatfiles to our ODS staging. Trying to figure out if it would be better just to push data directly to staging tables. I am not sure which is better in terms of recovery, reconcilliation, etc. Any advice or thoughts on this would be appreciated.

Hi,
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Please refer to below links for more information on configuration of ODI-OGG.
http://www.oracle.com/webfolder/technetwork/tutorials/obe/fmw/odi/odi_11g/odi_gg_integration/odi_gg_integration.htm
http://www.biblogs.com/2010/03/22/configuring-odi-10136-to-use-oracle-golden-gate-for-changed-data-capture/
Hope this information helps.
Thanks & Regards
SK

Pro/cons to have indexes on its own tablspace

hi ,
i have a new db running on oracle 10G R2 , various table spaces have been created that can be extended from 8M , 2M , 128K
my dba recommends that large insertion/updates tables goes to the 8M tablespace , but i notice that the indexes of those tables are in the same tablespace
ques :
1. can index exists on its own tablespace
2 . are there pro/cons of having indexes in its own tablspace ?
tks & rgds

Not really the proper forum for this question. You should have rather posted the question to the [url http://forums.oracle.com/forums/forum.jspa?forumID=61]Database Forum
> 1. can index exists on its own tablespace
Yes.
> 2 . are there pro/cons of having indexes in its own tablspace ?
Maybe.. it depends entirely on what your requirements are, and the nature of the data and hardware.
One reason to place indexes in a separate tablespace is simply for space management. E.g. this prevents some idiot developer of eating up all the space for tables, by indexing each and every column in a table and swamping the tablespaces with indexes.
Another reason is block sizes. Tablespaces can each have a different block sizes. You may want to use large 128KB blocks for data and smaller 32KB blocks for indexes.
That all said - personally I tend these days to prefer a single tablespace per logical database/application. In the past (especially back in Oracle 7) I always separated indexes and tables. But Oracle space management has improved so much, and we're dealing with such large data volumes these days, I do not think it is warranted without some sound technical reason to split data and indexes.

How can I use firefox with pro con latte extention on a linux OS that runs via a USB?

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How can you get the filter off if you can't remember the password? It's"pro con" and it wont even let me check out the rates for aflight.

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Is there anything available that covers the pros/cons of a simple and network PCD migration?

Is there anything available that covers the pros/cons of a simple and network PCD migration?

Hi,
as such there is no DOC but I can share my views:
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regds,
aman

Decorate window of class extending JFrame

Hello,
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Which is better? Extend JFrame or Wrap it in a class???

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Please help us by putting your first name into your profile. Thanks.
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Pros & cons of extending jframe or adding it

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