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• How can Java assignment be made to point to an object instead of making a copy?

  - by Matthew Piziak

  In a class, I have: private Foo bar; public Constructor(Foo bar) { this.bar = bar; } Instead of creating a copy of bar from the object provided in the parameter, is it possible to include a pointer to bar in the constructor such that changing the original bar changes the field in this object? Another way of putting it: int x = 7; int y = x; x = 9; System.out.print(y); //Prints 7. It is possible to set it up so that printing y prints 9 instead of 7?

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• Java - ClassNotFoundException I have the class included, but why do I get an exception?

  - by aloh

  public static Reservation[] openBinaryFile( String fileName ) { Reservation [] objArray = null; try { ObjectInputStream inStream = new ObjectInputStream( new FileInputStream( fileName ) ); objArray = (Reservation[])inStream.readObject(); inStream.close(); } catch( ClassNotFoundException e ) { System.out.println( "Exception: ClassNotFoundException." ); } I have the class included, but why do I get an exception? The class is in the same package as the others. Why am I getting this exception?

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• What's the catch to create _names _of _fields _like _these in java?

  - by Roman

  From time to time I see something like this: class Clazz { private int _goodName; private int _anotherGoodName; ... } I don't get it. It's hard and unusual to read such code. What are the pros?

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• Convert array of strings to array of double in java!!

  - by WM

  Marks[i] = Double.ParseDouble (StringOfMarks[i]); When i compile this it gives me possible loss of precision..?? any Clue

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• Can I pass an array as arguments to a method with variable arguments in Java?

  - by user352382

  I'd like to be able to create a function like: class A { private String extraVar; public String myFormat(String format, Object ... args){ return String.format(format, extraVar, args); } } The problem here is that args is treated as Object[] in the method myFormat, and thus is a single argument to String.format, while I'd like every single Object in args to be passed as a new argument. Since String.format is also a method with variable arguments, this should be possible. If this is not possible, is there a method like String.format(String format, Object[] args)? In that case I could prepend extraVar to args using a new array and pass it to that method.

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• How to call/get variables in another class in java? [closed]

  - by iownfloppydisk

  Please help me, i'm having a hard time with it. here is how should my program be. In first frame, there is a textfield1 where a user input text and when he press a button, a new frame will be display with a textfield2 that displays the inputted text from the textfield1

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• In java servlets, how do I tell if the current request is from an include?

  - by Spines

  From within a servlet, how can I tell if the servlet is being called by a RequestDispatcher("").include, or if it was called normally?

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• How do I enumerate the content of a zipped folder in Java?

  - by ripper234

  ZipeFile file = new ZipFile(filename); ZipEntry folder = this.file.getEntry("some/path/in/zip/"); if (folder == null || !folder.isDirectory()) throw new Exception(); // now, how do I enumerate the contents of the zipped folder?

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• Is Java class initialized by the thread which use it for the first time?

  - by oo_olo_oo

  Lets assume following classes definition: public class A { public final static String SOME_VALUE; static { SOME_VALUE = "some.value"; } } public class B { private final String value = A.SOME_VALUE; } Assuming that the class A hasn't been loaded yet, what does happen when object of the class B is instantiated by some thread T? The class A has to be loaded and instantiated first. But my question is: if it's done in context of the thread T, or rather in context of some other (special) "classloader" thread?

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• Java: Why subList(0, 5).clear() doesn't work on my objects?

  - by serg555

  If I run this operation on List<Integer> for example, it works as expected (removes first 5 elements), but when I run it on a list of my objects, nothing happens (list stays the same). list.subList(0, 5).clear(); My class is a pojo that doesn't implement equals or hashCode, if that matters.

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• how to print numbers using for loop in java?

  - by Balkrushn Viroja

  I have one text box in which I take the value of how many number do you want to print. Now My question is that how can I use for loop so that the number which I want to print is equal to the number that I got from textbox.One more thing is that i want to print only three numbers in one line. i.e. If I got 14 in my text box the result will look like below. 1 2 3 4 5 6 7 8 9 10 11 12 13 14

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• Why does this while terminate before receiving a value? (java)

  - by David

  Here's the relevant code snippet. public static Territory[] assignTerri (Territory[] board, String[] colors) { for (int i = 0; i<board.length; i++) { // so a problem is that Territory.translate is void fix this. System.out.print ("What team controls ") ; Territory.translate (i) ; System.out.println (" ?") ; boolean a = false ; while (a = false) { String s = getIns () ; if ((checkColor (s, colors))) { board[i].team = (returnIndex (s, colors)) ; a =true ; } else System.out.println ("error try again") ; } System.out.print ("How many unites are on ") ; Territory.translate (i) ; System.out.println (" ?") ; int n = getInt () ; board[i].population = n ; } return board ; } As an additional piece of information, checkColor just checks to make sure that its first argument, a string, is a string in one of the indexes of its second argument, an array. It seems to me that when the while the method gets a string from the keyboard and then only if that string checks out is a true and the while allowed to terminate. The output I get though is this: What team controls Alaska ? How many unites are on Alaska ? (there is space at the end to type in an input) This would seem to suggest that the while terminates before an input is ever typed in since the first line of text is within the while while the second line of text comes after it outside of it. Why is this happening?

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• Java: How to load a class (and its inner classes) that is already on the class path?

  - by Zombies

  How can I load a class that is already on the class path, instantiate it, and also instantiate any inner classes defined within it? EG: public class TestClass { public class InnerClass { } }

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• What method is easy to use to place components in java?

  - by iownfloppydisk

  Is it by using the setLocation or by layout? can you give me some advice how can i easy place a component in a frame?

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• How do I split text by "," and get rid of the "," in java?

  - by Jack Null

  I want to split and get rid of the comma's in a string like this that are entered into a textfield: 1,2,3,4,5,6 and then display them in a different textfield like this: 123456 here is what i have tried. String text = jTextField1.getText(); String[] tokens = text.split(","); jTextField3.setText(tokens.toString());

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• Why does this while terminate before recieving a value? (java)

  - by David

  here's the relevant code snippet. public static Territory[] assignTerri (Territory[] board, String[] colors) { for (int i = 0; i<board.length; i++) { // so a problem is that Territory.translate is void fix this. System.out.print ("What team controls ") ; Territory.translate (i) ; System.out.println (" ?") ; boolean a = false ; while (a = false) { String s = getIns () ; if ((checkColor (s, colors))) { board[i].team = (returnIndex (s, colors)) ; a =true ; } else System.out.println ("error try again") ; } System.out.print ("How many unites are on ") ; Territory.translate (i) ; System.out.println (" ?") ; int n = getInt () ; board[i].population = n ; } return board ; } as an additional piece of information, checkColor just checks to make sure that its first argument, a string, is a string in one of the indexes of its second argument, an array. it seems to me that when the while the method gets a string from the keyboard and then only if that string checks out is a true and the while allowed to terminate. The output i get though is this: What team controls Alaska ? How many unites are on Alaska ? (there is space at the end to type in an input) This would seem to suggest that the while terminates before an input is ever typed in since the first line of text is within the while while the second line of text comes after it outside of it. why is this happening?

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• different ways of checking the type of an object in java?

  - by GK

  I have an object obj and a class name MyClass, i can check whether obj is of the type MyClass using either instanceof or i can say obj.getClass().equals("MyClass"). So i want to know are there any other ways of checking the type of an object.

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• How do I do "nested if" in JSTL for Java JSP?

  - by user678616

  I want to do something like the following: <c:choose> <c:when test="${empty example1}"> </c:when> <c:otherwise> <c:when test="${empty example2}"> </c:when> <c:otherwise> </c:otherwise> </c:otherwise> </c:choose> Is this even possible? I get an exception thrown when trying to run. Thank you.

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• How to display an output of float data with 2 decimal places in Java?

  - by via-point

  Can I do it with system.out.print? Thank you.

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• How to define a method that can take arbitary arguments in java?

  - by symfony

  I'm new to this language,is there a demo? Thanks

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• Translating Between Unicode and Non-Unicode Character Sets in Java

  You can use Java APIs not only to help translate characters, strings, and text streams to other languages, but also to convert Unicode character sets to non-Unicode and vice versa.

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• James Gosling, père fondateur de Java, confirme avoir démissionné d'Oracle le 2 avril

  Après les départs de Jonathan Schwartz, Simon Phipps, et très récemment Kohsuke Kawaguchi (Hudson notamment), c'est désormais officiel : James Gosling quitte lui aussi Oracle. Que vous inspire ce dernier départ pour l'avenir de la plateforme Java et sur l'image que toutes ces démissions, synonymes de refus d'adhésion au projet d'entreprise Oracle, véhicule ?...

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• Programmation concurrente en Java de Brian Goetz, critique par Eric Reboisson

  Je viens de lire "Programmation concurrente en Java" et je vous le recommande vivement.Une chose m'a particulièrement marqué : Trop peu de développeurs se soucient de la justesse de leur programme. Un peu comme pour la propreté du code (cf Clean Code), ils sont nombreux à s'arrêter dès que ça fonctionne ! Or en ce qui concerne la concurrence, les conditions limites vont s'exprimer le plus souvent en production et non en développement.Je ne dis pas qu'il faut faire systématiquement du code multithread...

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• Java Tools Support Offering Now Available

  - by Duncan Mills

  Great news! Developers can now purchase a combined support offering covering all three of Oracle's Java IDE options (JDeveloper, Oracle Enterprise Pack for Eclipse and NetBeans) in one premier support package. So no matter what tool, or mix of tools you use, you're covered! See Oracle Development Tools Support Offering for Details. A similar bundle is available for Oracle Solaris Development tools support which is detailed on the same page.

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• Am 10.02. startet WebCast-Serie für Java Entwickler und WebLogic Interessenten: WebLogic Developer - Get the latest on Oracle WebLogic Server and Java EE 6

  - by Thomas Leopold

  v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Accelerate Your Development with Oracle WebLogic Suite Many organisations are reducing travel, conference, and training budgets for their developers without any change to the results expected of those developers. So how can you keep up with the latest developments?By receiving training, delivered free of charge, at your desk!Join us during February and March for a series of online events designed and run by the development team at Oracle. Learn how Oracle WebLogic Suite enables a whole new level of productivity for enterprise developers.Virtual Developer Day - 10th FebruaryStarting with our Virtual Developer Day on 10th February, join us for a blend of hands-on labs, live chat and presentations covering the latest on WebLogic, Java EE 6 and the programming tenets that have made it a true platform breakthrough.Weekly WebLogic Webcasts from 17th February to 17th MarchAfterwards, join us every week from 17th February to 17th March for our weekly one-hour webcasts where we will show you how to build an application from the ground up using Java and JEE technologies. Presented by the engineering team for WebLogic, these webcasts will be of great value to developers and architects, not just those already using WebLogic.For registration, full session abstracts and schedule please click here. Don't miss out! Register now to join our virtual events and keep up with all the latest developments. Find out more and register now Copyright © 2011, Oracle Corporation and/or its affiliates.All rights reserved. Contact Us | Legal Notices and Terms of Use | Privacy Statement

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