Cyclic Constructors

I was working on a project when I ran into a stack overflow error. It looks like two classes call to each others' constructors cyclically. I made some simplified code to demonstrate the error:
public class ASuperClass {
     public ASuperClass() {
          ASubClass asubclass = new ASubClass();
public class ASubClass extends ASuperClass {
public class Test {
     public static void main(String[] args) {
          ASuperClass asuperclass = new ASuperClass();
Upon running Test, I receive the following:
Exception in thread "main" java.lang.StackOverflowError
     at ASuperClass.<init>(ASuperClass.java:3)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
     at ASuperClass.<init>(ASuperClass.java:4)
     at ASubClass.<init>(ASubClass.java:2)
Are superclasses unable to contain objects of their subclasses? Is there a work around for this? Thanks for your time.

When posting code, please use code tags so it will be readable: http://forums.oracle.com/forums/ann.jspa?annID=1606
Are superclasses unable to contain objects of their subclasses? They can. There's nothing special about it. It's no different any class containing a reference to any other class. The question is, why would you want to? Usually a superclass shouldn't even know about its subclasses, much less have references to them.
Is there a work around for this? It's not a matter of a workaround. It's just a matter of not telling the code to recurse infinitely. Since a subclass constructor always invokes its superclass's c'tor, you can't construct a subclass instance as part of the construction of a superclass instance, as you've seen. Pass it as a parameter to the c'tor, or set it later.
The question remains, though, why you think you need this. Every subclass instance IS-A superclass instance, so it doesn't make sense for every super instance to have a reference to a sub instance, which is itself a super.

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Hi Didier
I read your code, downloaded junit and ran your test. The test fails, so back to a few System.out.println statements!
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I thought so, too.
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Thanks again.

I am using Windows 8.1 i have an External Hard Disk and one drive is now inaccessible due to sudden power failure few days ago. Now it shows "Data error (Cyclic redundancy check)". I want all my important files and Pics. How ?

Hi,
I am using Windows 8.1
I have an External Hard Disk i have partitioned it to 4 parts.
One drive is now inaccessible due to sudden power failure while listening Music from that drive few days ago.
Now it shows "Data error (Cyclic redundancy check)".
I tried all the procedures provided here like
chkdsk /f, diskpart, rescan etc
but no result :( (i mean all processes failed. They could not detect the drive).
Please help me to get those data, pictures and project files.
thank you

Then why aren't you posting this in the Windows 8 forums found @
http://social.technet.microsoft.com/Forums/windows/en-US/home?category=w8itpro
This is a Windows 7 forum for discussion about Windows 7.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”

Error while calling a super class public method in the subclass constructor

Hi ,
I have code like this:
CLASS gacl_applog DEFINITION ABSTRACT.
PUBLIC SECTION.
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                          pf_subobj    TYPE balsubobj
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ENDCLASS.
CLASS gacl_applog IMPLEMENTATION.
METHOD create_new_a.
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Header aufsetzen
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A public method of Super class has been called from the constructor of the sub class. we are getting the syntax error :
' In the constructor method, you can only access instance attributes, instance methods, or "ME" after calling the constructor of the superclass'
Can you please suggest how to change the code with out affecting the functioanlity.
Thank you ,
Lakshmi.

Hi,
Call that method by instance of Subclass.   OR
SUPER-->method.
Read very useful document
Constructors
Constructors are special methods that cannot be called using CALL METHOD. Instead, they are called automatically by the system to set the starting state of a new object or class. There are two types of constructors - instance constructors and static constructors. Constructors are methods with a predefined name. To use them, you must declare them explicitly in the class.
The instance constructor of a class is the predefined instance method CONSTRUCTOR. You declare it in the public section as follows:
METHODS CONSTRUCTOR
        IMPORTING.. [VALUE(]<ii>[)] TYPE type [OPTIONAL]..
        EXCEPTIONS.. <ei>.
and implement it in the implementation section like any other method. The system calls the instance constructor once for each instance of the class, directly after the object has been created in the CREATE OBJECT statement. You can pass the input parameters of the instance constructor and handle its exceptions using the EXPORTING and EXCEPTIONS additions in the CREATE OBJECT statement.
The static constructor of a class is the predefined static method CLASS_CONSTRUCTOR. You declare it in the public section as follows:
CLASS-METHODS CLASS_CONSTRUCTOR.
and implement it in the implementation section like any other method. The static constructor has no parameters. The system calls the static constructor once for each class, before the class is accessed for the first time. The static constructor cannot therefore access the components of its own class.
Pls. reward if useful....

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I guess there is a problem with your XP CD, probably scratched or did not burn successfully. Have you tried it with another installation cd?

Value set in constructor is not getting saved in button Action method

Hi All,
I am not understanding why the value set ( On Condition )in constructor is not hold in the button actoin method.
Could any body explain me on that
for this I will try to explain with sample example
I have taken a button and add a integer property in session bean.
now if session bean's property is even then I am trying to set the button value to bidNow other wise Accept Invitation.
Till this opstion everything is OK
but once I click on Button,
Constructor is doing the right job only. But I do not understand why in button action I am getting the First Value only.
public Page1() {
        // <editor-fold defaultstate="collapsed" desc="Creator-managed Component Initialization">
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            else
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            log("In Constructor Button Value : "+button1.getValue());
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            throw e instanceof javax.faces.FacesException ? (FacesException) e: new FacesException(e);
        // </editor-fold>
        // Additional user provided initialization code
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        // TODO Replace with your code
        log("In Action Button Value : "+button1.getValue());
        return null;
    }and here is the log
[#|2005-07-19T11:55:17.859+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:17.859+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:18.359+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:18.359+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:18.843+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:18.843+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:19.312+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:19.312+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:19.828+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:19.828+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:20.234+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:20.250+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:20.828+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:20.828+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:21.328+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:21.328+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:35.437+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:35.437+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:35.906+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:35.921+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:36.265+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:36.265+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:36.890+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:36.890+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:37.171+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : BidNow|#]
[#|2005-07-19T11:55:37.171+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]
[#|2005-07-19T11:55:37.468+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Constructor Button Value : Accept Invitation|#]
[#|2005-07-19T11:55:37.468+0530|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.container.web|_ThreadID=14;|WebModule[/webapplication12]In Action Button Value : BidNow|#]As per this log every time I am getting Bid Now only in action, though the value is changed in Construtcor
Can u explain the reason for this

Hi Sudhakar,
Please try the following and you will get an idea as to what is happening:
1. Drag and drop a button, 2 outputText components
2. Add a property to the session bean called intValue of type int. Customize it to set it's initial value to 0
3. Add the following lines of code to the constructor
outputText1.setValue("" + getSessionBean1().getIntValue());
getSessionBean1().setIntValue(getSessionBean1().getIntValue()+1);
4. Double click on the button component to go to the button action method.
5. Add the following line of code
outputText2.setValue("" + etSessionBean1().getIntValue());
6. Save and run the application
7. Watch the values of outputText1 and outputText2 with each click of the button
Also, try the application with the following code block in the button action method:
if(getSessionBean1().getIntValue()%2==0){
button1.setValue("Bid Now");
} else{
button1.setValue("Accept Invitation");
getSessionBean1().setIntValue(getSessionBean1().getIntValue()+1);
outputText1.setValue(button1.getValue());
outputText2.setValue("" + getSessionBean1().getIntValue());
When the above code block is in the button action method the values set to button are as expected.
Hope that helps
Cheers
Giri :-)

Passing arraylist between constructors?

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and
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stuff is still fairly beyond me, I understand the principles behind the
language and the problem, but the solution has been evading me so far.
If anyone could give me any help or a solution here I'd be very
grateful- I'm getting totally stressed over this.
The code I'm working on is below, I've highlighted where the error
crops up too- it's about line 200-206 area. Sorry for the length, I was
unsure as to how much of the code I should post.
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jScrollBelow;
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private JMenuBar menuBar;
private JMenu fileMenu;
private JMenuItem newItem, openItem, saveItem,
exitItem;
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command
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private JLabel question;
// These JButtons are used with the verifyDialog object
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overloaded constructor
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ParserConfigurationException
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for ( int i = 1; i < xmlText.size(); i++ )
textArea.append( ( String )xmlText.get( i ) + "\n" );
try
XMLTree.refresh( textArea.getText() );
catch( Exception ex )
String message = ex.getMessage();
System.out.println( message );
}//end try/catch
} //end Editor( String title, String xml )
* This constructor builds a frame containing a JSplitPane, which in
turn contains two
JScrollPanes.
* One of the panes contains an XMLTree object and the other contains
a JTextArea object.
public Editor( String title ) throws ParserConfigurationException
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super( title );
Toolkit toolkit;
Dimension dim, minimumSize;
int screenHeight, screenWidth;
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setBackground( Color.lightGray );
getContentPane().setLayout( new BorderLayout() );
// Set the frame's display to be WIDTH x HEIGHT in the middle of
the screen
toolkit = Toolkit.getDefaultToolkit();
dim = toolkit.getScreenSize();
screenHeight = dim.height;
screenWidth = dim.width;
setBounds( (screenWidth-FRAME_WIDTH)/2,
(screenHeight-FRAME_HEIGHT)/2, FRAME_WIDTH,
FRAME_HEIGHT );
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// Build the verify dialog
// Set the Default Close Operation
// Create the refresh button object
// Add the button to the frame
// Create two JScrollPane objects
jScroll = new JScrollPane();
jScrollRt = new JScrollPane();
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// Create the JTextArea and add it to the right hand JScroll
textArea = new JTextArea( 200,150 );
jScrollRt.getViewport().add( textArea );
// Next, create the XMLTree
XMLTree = new XMLTree();
XMLTree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION
XMLTree.setShowsRootHandles( true );
// A more advanced version of this tool would allow the JTree to
be editable
XMLTree.setEditable( false );
// Wrap the JTree in a JScroll so that we can scroll it in the
JSplitPane.
jScroll.getViewport().add( XMLTree );
// Create the JSplitPane and add the two JScroll objects
splitPane = new JSplitPane( JSplitPane.HORIZONTAL_SPLIT, jScroll,
jScrollRt );
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(200);
jScrollUp = new JScrollPane();
jScrollBelow=new JScrollPane();
// Here is were the error is coming up
String [] items = (String []) xmlText.toArray (new String[
xmlText.size () ]);
JComboBox queryBox = new JComboBox(items);
JComboBox queryBox2 = new JComboBox(items);
JComboBox queryBox3 = new JComboBox(items);
JComboBox queryBox4 = new JComboBox(items);
JComboBox queryBox5 = new JComboBox(items);
* I'm adding the scroll pane to the split pane,
* a panel to the top of the split pane, and some uneditible
combo boxes
* to them. Then I'll rearrange them to rearrange them, but
unfortunately am getting an error thrown up above.
panel = new JPanel();
panel.add(queryBox);
panel.add(queryBox2);
panel.add(queryBox3);
panel.add(queryBox4);
panel.add(queryBox5);
jScrollUp.getViewport().add( panel );
// Now building a text area
textArea3 = new JTextArea(200, 150);
jScrollBelow.getViewport().add( textArea3 );
splitPane2 = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
jScrollUp, jScrollBelow);
splitPane2.setPreferredSize( new Dimension(300, 200) );
splitPane2.setDividerLocation(100);
splitPane2.setOneTouchExpandable(true);
// in here can change the contents of the split pane
getContentPane().add(splitPane2,BorderLayout.SOUTH);
// Provide minimum sizes for the two components in the split pane
minimumSize = new Dimension(200, 150);
jScroll.setMinimumSize( minimumSize );
jScrollRt.setMinimumSize( minimumSize );
// Provide a preferred size for the split pane
splitPane.setPreferredSize( new Dimension(400, 300) );
// Add the split pane to the frame
getContentPane().add( splitPane, BorderLayout.CENTER );
//Put the final touches to the JFrame object
validate();
setVisible(true);
// Add a WindowListener so that we can close the window
winClosing = new WindowAdapter()
public void windowClosing(WindowEvent e)
verifyDialog.show();
addWindowListener(winClosing);
} //end Editor()
* When a user event occurs, this method is called. If the action
performed was a click
* of the "Refresh" button, then the XMLTree object is updated using
the current XML text
* contained in the JTextArea
public void actionPerformed( ActionEvent ae )
if ( ae.getActionCommand().equals( "Refresh" ) )
try
XMLTree.refresh( textArea.getText() );
catch( Exception ex )
String message = ex.getMessage();
ex.printStackTrace();
}//end try/catch
else if ( ae.getActionCommand().equals( "OK" ) )
exit();
else if ( ae.getActionCommand().equals( "Cancel" ) )
verifyDialog.hide();
}//end if/else if
} //end actionPerformed()
// Program execution begins here. An XML file (*.xml) must be passed
into the method
public static void main( String[] args )
String fileName = "";
BufferedReader reader;
String line;
ArrayList xmlText = null;
Editor Editor;
// Build a Document object based on the specified XML file
try
if( args.length > 0 )
fileName = args[0];
if ( fileName.substring( fileName.indexOf( '.' ) ).equals(
".xml" ) )
reader = new BufferedReader( new FileReader( fileName )
xmlText = new ArrayList();
while ( ( line = reader.readLine() ) != null )
xmlText.add( line );
} //end while ( ( line = reader.readLine() ) != null )
// The file will have to be re-read when the Document
object is parsed
reader.close();
// Construct the GUI components and pass a reference to
the XML root node
Editor = new Editor( "Editor 1.0", xmlText );
else
help();
} //end if ( fileName.substring( fileName.indexOf( '.' )
).equals( ".xml" ) )
else
Editor = new Editor( "Editor 1.0" );
} //end if( args.length > 0 )
catch( FileNotFoundException fnfEx )
System.out.println( fileName + " was not found." );
exit();
catch( Exception ex )
ex.printStackTrace();
exit();
}// end try/catch
}// end main()
// A common source of operating instructions
private static void help()
System.out.println( "\nUsage: java Editor filename.xml" );
System.exit(0);
} //end help()
// A common point of exit
public static void exit()
System.out.println( "\nThank you for using Editor 1.0" );
System.exit(0);
} //end exit()
class newMenuHandler implements ActionListener
public void actionPerformed( ActionEvent ae )
textArea.setText( "" );
try
// Next, create a new XMLTree
XMLTree = new XMLTree();
XMLTree.getSelectionModel().setSelectionMode(
TreeSelectionModel.SINGLE_TREE_SELECTION );
XMLTree.setShowsRootHandles( true );
// A more advanced version of this tool would allow the JTree
to be editable
XMLTree.setEditable( false );
catch( Exception ex )
String message = ex.getMessage();
ex.printStackTrace();
}//end try/catch
}//end actionPerformed()
}//end class newMenuHandler
class openMenuHandler implements ActionListener
JFileChooser jfc;
Container parent;
int choice;
openMenuHandler()
super();
jfc = new JFileChooser();
jfc.setSize( 400,300 );
jfc.setFileFilter( new XmlFileFilter() );
parent = openItem.getParent();
}//end openMenuHandler()
public void actionPerformed( ActionEvent ae )
// Displays the jfc and sets the dialog to 'open'
choice = jfc.showOpenDialog( parent );
if ( choice == JFileChooser.APPROVE_OPTION )
String fileName, line;
BufferedReader reader;
fileName = jfc.getSelectedFile().getAbsolutePath();
try
reader = new BufferedReader( new FileReader( fileName ) );
textArea.setText( reader.readLine() + "\n" );
while ( ( line = reader.readLine() ) != null )
textArea.append( line + "\n" );
} //end while ( ( line = reader.readLine() ) != null )
// The file will have to be re-read when the Document
object is parsed
reader.close();
XMLTree.refresh( textArea.getText() );
catch ( Exception ex )
String message = ex.getMessage();
ex.printStackTrace();
}//end try/catch
jfc.setCurrentDirectory( new File( fileName ) );
} //end if ( choice == JFileChooser.APPROVE_OPTION )
}//end actionPerformed()
}//end class openMenuHandler
class saveMenuHandler implements ActionListener
JFileChooser jfc;
Container parent;
int choice;
saveMenuHandler()
super();
jfc = new JFileChooser();
jfc.setSize( 400,300 );
jfc.setFileFilter( new XmlFileFilter() );
parent = saveItem.getParent();
}//end saveMenuHandler()
public void actionPerformed( ActionEvent ae )
// Displays the jfc and sets the dialog to 'save'
choice = jfc.showSaveDialog( parent );
if ( choice == JFileChooser.APPROVE_OPTION )
String fileName;
File fObj;
FileWriter writer;
fileName = jfc.getSelectedFile().getAbsolutePath();
try
writer = new FileWriter( fileName );
textArea.write( writer );
// The file will have to be re-read when the Document
object is parsed
writer.close();
catch ( IOException ioe )
ioe.printStackTrace();
}//end try/catch
jfc.setCurrentDirectory( new File( fileName ) );
} //end if ( choice == JFileChooser.APPROVE_OPTION )
}//end actionPerformed()
}//end class saveMenuHandler
class exitMenuHandler implements ActionListener
public void actionPerformed( ActionEvent ae )
verifyDialog.show();
}//end actionPerformed()
}//end class exitMenuHandler
class XmlFileFilter extends javax.swing.filechooser.FileFilter
public boolean accept( File fobj )
if ( fobj.isDirectory() )
return true;
else
return fobj.getName().endsWith( ".xml" );
}//end accept()
public String getDescription()
return "*.xml";
}//end getDescription()
}//end class XmlFileFilter
} //end class Editor
Sorry if this post has been a bit lengthy, any help you guys could give
me solving this would be really appreciated.
Thanks,
Iain.

Hey. Couple pointers:
When posting, try to keep code inbetween code tags (button between spell check and quote original). It will pretty-print the code.
Posting code is good. Usually, though, you want to post theminimum amount of code which runs and shows your problem.
That way people don't have to wade through irrelevant stuff and
they have an easier time helping.
http://homepage1.nifty.com/algafield/sscce.html
As for your problem, this is a scope issue. You declare an
ArrayList xmlText in main(). That means that everywhere after
the declaration in main(), you can reference your xmlText.
So far so good. Then, inside main(), you call
Editor = new Editor( "Editor 1.0", xmlText );Now you've passed the xmlText variable to a new method,
Editor(String title, ArrayList xmlText) [which happens to be a
constructor, but that's not important]. When you do that, you
make the two variables title and xmlText available to the whole
Editor(String, ArrayList) method.
This is where you get messed up. You invoke another method
from inside Editor(String, ArrayList). When you call
this(title);you're invoking the method Editor(String title). You aren't passing
in your arraylist, though. You've got code in the Editor(String) method
which is trying to reference xmlText, but you'd need to pass in
your ArrayList in order to do so.
My suggestion would be to merge the two constructor methods into
one, Editor(String title, ArrayList xmlText).

Code in main does not require catch, but code in constructor does

this is the original program, its all in main. i took all the code out of main and put it in a constructor to make it more usable, and started making the necessary adjustments. i eventually got it to work but i had to catch exceptions EVERYWHERE. why does this code not require so many exceptions when the code is in main?
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
public class MainClass {
public static void main(String args[]) throws Exception {
    URL u = new URL("");
    URLConnection uc = u.openConnection();
    String contentType = uc.getContentType();
    int contentLength = uc.getContentLength();
     // ||
    if (contentLength == -1) {
      throw new IOException("Error: No File Found.");
    InputStream raw = uc.getInputStream();
    InputStream in = new BufferedInputStream(raw);
    byte[] data = new byte[contentLength];
    int bytesRead = 0;
    int offset = 0;
    while (offset < contentLength) {
      bytesRead = in.read(data, offset, data.length - offset);
      if (bytesRead == -1)
        break;
      offset += bytesRead;
    in.close();
    if (offset != contentLength) {
      throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes");
     String dirText = "text";
     String dirTarget = "target";
     String filename = u.getFile().substring(u.getFile().lastIndexOf('/') + 1);
     String dirAndFile;
     // determine weather the file is a target or is to be parsed for more files
     if(contentType.startsWith("text/")) {
          dirAndFile = dirText + "\\" + filename;
     else {
          dirAndFile = dirTarget + "\\" + filename;
    FileOutputStream out = new FileOutputStream(dirAndFile);
    out.write(data);
    out.flush();
    out.close();
}Edited by: chopficaro on May 1, 2010 8:15 AM

ok but still, why do i not have to catch all these exceptions when the code is in main rather than a constructor? heres the code after i put it in the constructor:
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.MalformedURLException;
public class MainClass {
     public static void main(String args[]) throws Exception
          MainClass mc = new MainClass("http://www.google.com/intl/en_ALL/images/logo.gif");
     MainClass(String addr)
          URL u = null;
          try
               u = new URL(addr);
          catch (MalformedURLException e)
               // Print out the exception that occurred
               System.out.println("Invalid URL "+addr+": "+e.getMessage());
          URLConnection uc = null;
          try
               uc = u.openConnection();
          catch (IOException e)
               // Print out the exception that occurred
               System.out.println("Unable to create "+addr+": "+e.getMessage());
          String contentType = uc.getContentType();
          int contentLength = uc.getContentLength();
          if (contentLength == -1)
               System.out.println("no file");//throw new IOException("Error: No File Found.");
          InputStream raw=null;
          InputStream in=null;
          try
               raw = uc.getInputStream();
               in = new BufferedInputStream(raw);
          catch (IOException e)
          // Print out the exception that occurred
          System.out.println("bad input stream "+e.getMessage());
          byte[] data = new byte[contentLength];
          int bytesRead = 0;
          int offset = 0;
          while (offset < contentLength)
               try
                    bytesRead = in.read(data, offset, data.length - offset);
               catch (IOException e)
                    // Print out the exception that occurred
                    System.out.println(e.getMessage());
               if (bytesRead == -1)
               break;
               offset += bytesRead;
          try
               in.close();
          catch (IOException e)
               // Print out the exception that occurred
               System.out.println(e.getMessage());
          if (offset != contentLength)
               System.out.println("didnt read enough bytes"); //throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes");
          String dirText = "text";
          String dirTarget = "target";
          try
               String filename = u.getFile().substring(u.getFile().lastIndexOf('/') + 1);
               String dirAndFile;
               // determine weather the file is a target or is to be parsed for more files
               if(contentType.startsWith("text/"))
                    dirAndFile = dirText + "\\" + filename;
               else
                    dirAndFile = dirTarget + "\\" + filename;
               FileOutputStream out = new FileOutputStream(dirAndFile);
               out.write(data);
               out.flush();
               out.close();
          catch (IOException e)
               // Print out the exception that occurred
               System.out.println(e.getMessage());
}

Problem with root and constructors

hello guys,
i have serious problem, its 2 days i am trying to do something about it,
i have some object inside object inside another object,
if in their constructors i write:
MovieClip(root).someVar
(or function)
its not working!
it works only i regular functions,
i cant even call a egular function from the constructor,
please help my guys, i really need this!
thanks alot!

function YourDisplayObjectClass(){
// this is the contructor
// trying to reference MovieClip(root) or stage will trigger a null ref error
// because YourDisplayObjectClass instance isn't added to the stage, yet
this.addEventListener(Event.ADDED_TO_STAGE,init);
private function init():void{
// from here you can reference displaylist items.
trace(MovieClip(root),stage);

Having a problem with inheritance and a constructor

i have two classes, i'm just going to give the constructors anyway. I'm having trouble getting the CDImage constructor to inherit something from songs, I believe the instructions are missing something or the cs lab guy misinterpreted them.
package songs;
import java.text.*;
public class Song implements Comparable {
    private int songLength;
    private String artistName;
    private String songName;
    public Song(int songLength, String artistNames, String songName) {
        this.songLength = songLength;
        this.artistName = artistNames;
        this.songName = songName;
    }These are the instructions that i beleive may be incorrect:
Design a CDImage class to represent a music CD. The constructor takes three parameters: the title of the CD, the recording label, and the number of tracks on the CD. (Each track contains one song.) The CDImage class uses the Song class developed above and should contain methods to accomplish the following:package songs;
import java.text.*;
public class CDImage extends Song {
    private String title;
    private String label;
    private int numberTracks;
    private Song[] songs;
    public CDImage(String title, String label, int tracks){
    this.title = title;// this is the album name
    this.label = label;
    numberTracks = tracks;
    songs = new Song [numberTracks];
    }i know i need to use the super modifier under the constructor but how? because nothing in the constructor of the CDImage class refers directly to the constructor in the Song class
thanks in advance.
Message was edited by:
kevin123

you know whats funny, this project has to do with arrays of objects and not inheritance. We learned inheritance last week but the lab we are doing which is this, is for arrays of objects. sorry for the confusion lol. so you can completely ignore this, it actually has it in big bold letters at the top of the web page for the lab.

Problem with constructors and using public classes

Hi, I'm totally new to Java and I'm having a lot of problems with my program :(
I have to create constructor which creates bool's array of adequate size to create a sieve of Eratosthenes (for 2 ->n).
Then it has to create public method boolean prime(m) which returs true if the given number is prime and false if it's not prime.
And then I have to create class with main function which chooses from the given arguments the maximum and creates for it the sieve
(using the class which was created before) and returns if the arguments are prime or not.
This is what I've written but of course it's messy and it doesn't work. Can anyone help with that?
//part with a constructor
public class ESieve {
ESieve(int n) {
boolean[] isPrime = new boolean[n+1];
for (int i=2; i<=n; i++)
isPrime=true;
for(int i=2;i*i<n;i++){
if(isPrime[i]){
for(int j=i;i*j<=n;j++){
isPrime[i*j]=false;}}}
public static boolean Prime(int m)
for(int i=0; i<=m; i++)
if (isPrime[i]<2) return false;
try
m=Integer.parseInt(args[i]);
catch (NumberFormatException ex)
System.out.println(args[i] + " is not an integer");
continue;
if (isPrime[i]=true)
System.out.println (isPrime[i] + " is prime");
else
System.out.println (isPrime[i] + " is not prime");
//main
public class ESieveTest{
public static void main (String args[])
public static int max(int[] args) {
int maximum = args[0];
for (int i=1; i<args.length; i++) {
if (args[i] > maximum) {
maximum = args[i];
return maximum;
new ESieve(maximum);
for(int i=0; i<args.length; i++)
Prime(i);}

I've made changes and now my code looks like this:
public class ESieve {
ESieve(int n) {
   sieve(n);
public static boolean sieve(int n)
     boolean[] s = new boolean[n+1];
     for (int i=2; i<=n; i++)
s=true;
for(int i=2;i*i<n;i++){
if(s[i]){
for(int j=i;i*j<=n;j++){
s[i*j]=false;}}}
return s[n];}
public static boolean prime(int m)
if (m<2) return false;
boolean x = sieve(m);
if (x=true)
System.out.println (m + " is prime");
else
System.out.println (m + " is not prime");
return x;}
//main
public class ESieveTest{
public static int max(int[] args) {
int maximum = args[0];
for (int i=1; i<args.length; i++) {
if (args[i] > maximum) {
maximum = args[i];
return maximum;
public static void main (String[] args)
int n; int i, j;
for(i=0;i<=args.length;i++)
n=Integer.parseInt(args[i]);
int maximum=max(args[]);
ESieve S = new ESieve(maximum);
for(i=0; i<args.length; i++)
S.prime(i);}
It shows an error for main:
{quote} ESieveTest.java:21: '.class' expected
int maximum=max(args[]); {quote}
Any suggestions how to fix it?

Problem with constructor of inner class.

Hi everybody!
I have an applet which loads images from a database.
i want to draw the images in a textarea, so i wrote an inner class, which extends textarea and overrides the paint method.
but everytime i try to disply the applet in the browser this happens:
java.lang.NoClassDefFoundError: WohnungSuchenApplet$Malfl�che
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
at java.lang.Class.getConstructor0(Class.java:1762)
at java.lang.Class.newInstance0(Class.java:276)
at java.lang.Class.newInstance(Class.java:259)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:567)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1778)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:496)
at sun.applet.AppletPanel.run(AppletPanel.java:293)
at java.lang.Thread.run(Thread.java:536)
so my class has no own constructor, it just has the paint method overwritten.
my class looks like this:
public class Malfl�che extends javax.swing.JTextArea{
public void paint(Graphics g){
Color grey=new Color(220,220,220);
g.drawImage(img,10,10,null);
how should a constructor for this class look like?
sorry i am quite new to this, so i really dont have a clue!
my class does not have any attributes or requires any so it doesnt need a constructor, doesnt it?
thanks a lot
tim

First off, unlike regular classes, inner classes can be declared public, private, protected, and default.
Secondly, why are you using the JTextArea to display an image, why not use a JLabel, which takes an Image object as its constructor.
Thirdly, when you drew your image you did not give it a width and height
g.drawImage(img, 0,0, img.getWidth(null), img.getHeight(null), null);
otherwise it will make your image 1 X 1 pixels. not big enough to see.

Unable to Create Requestor ABCS using AIA Constructor in Jdev 11.1.1.2

Hi Gurus,
I'm currently trying to create ABCS Requester with J developer 11.1.1.2 using the AIA Service Constructor.
The Composite Application shows the BPEL Component and the target services under the Composite screen.When we click on the BPEL Component we dont the process flow.
Steps Followed
1. Create project in Project Lifecycle Workbench
2.Using the AIA Service Constructor connect to the AIA_LIFECYCLE Workbench.
3.Select the RequestorABCS Service
4.Filled out all the ApplicationName,ShortName,Service Version etc on Step 3 of 8
5. Selected the Service Operation as Query.
6.Under ABM import the Custom XSD structure and provided the Input and output message
7.Select the message pattern as request/response
8.Target Service Step selected the Query Service (this would query the required Customer Content which needs to be mapped).
9.The the AIA Service Constructor creates BPEL Composite Component.
When we double and open the BPEL Component we just see the error handling and partner link information.
We are unable see any assign,scope invoke component on the swim lanes..
Has anyone experienced this issue while creating ABCS Requester.
Regards
Sabir

Hi Everyone,
I was able to create Requestor ABCS in Jdev 11.1.1.2 by selecting EBS,wsdl as target. This is workaround you need to follow to create requestor ABCS where you have V2 wsdl available.
Looks like there is bug#9541128 assigned for this issue. And looks like it would be fixed in 11.1.1.4 version of Jdev as per Oracle Support.
Regards
Sabir

Difference between constructor & Methods if any ?

In the below code I use the constructor ConstructorShirt1('M') to pass the value of M to the class ConstructorShirt1, but why do we have to do this, instead can we not just use a method and write the same thing in a method.
class ConstructorShirt1Test {
public static void main (String args[]) {
ConstructorShirt1 constShirt = new ConstructorShirt1('M');
char colorCode;
colorCode = constShirt.getColorCode();
System.out.println("Color Code: " + colorCode);
class ConstructorShirt1 {
private int shirtID = 0; // Default ID for the shirt
private String description = "-description required-"; // default
// The color codes are R=Red, B=Blue, G=Green, U=Unset
private char colorCode = 'U';
private double price = 0.0; // Default price for all items
private int quantityInStock = 0; // Default quantity for all items
public ConstructorShirt1(char startingCode) {
switch (startingCode) {
case 'R':
case 'G':
case 'B':
colorCode = startingCode;
break;
default:
System.out.println("Invalid colorCode. Use R, G, or B");
public char getColorCode() {
return colorCode;
} // end of class
So I am not clear what is the difference between constructor and methods if any ? or if not when to use a constructor and when to use a method.
I would be glad if somebody throws light on this topic.
PK

There shouldn't be any confusion on this one... a constructor is meant to create an instance of the class. It can also set the state of its member variables in the process, like the constructor you are using. The same can also be done by a method.
Wouldn't make much of a difference for simple programs, but this is more pertinent when it comes to designing classes. Like if the developer using the class needs to know what all states he has to set before he needs to do anything useful, then it is better to provide a constructor with some arguments for doing that.

Cyclic Constructors

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