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• Any way to force classes to have public static final field in Java?

  - by serg555

  Is there a way to force classes in Java to have public static final field (through interface or abstract class)? Or at least just a public field? I need to make sure somehow that a group of classes have public static final String TYPE = "..."; in them.

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• How would you convert a String to a Java string literal?

  - by Simon Nickerson

  This is sort of the Java analogue of this question about C#. Suppose I have a String object which I want to represent in code and I want to produce a string literal that maps to the same thing. I was just about to write a state machine that ingests the string character by character and escapes appropriately, but then I wondered if there was a better way, or a library that provides a function to do this.

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• Java Servlets - How do I detect if a user is from a mobile device?

  - by Spines

  Java Servlets - How do I detect if a user is from a mobile device? I'm using the TinyMCE javascript editor, and it doesn't work on the iphone. How can I detect if the user is coming from a mobile device?

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• I'm trying to simulate a directly mapped cache in java. Any ideas on which data structure to use to

  - by bananamana

  I'm trying to simulate a directly mapped cache in java. Any ideas on which data structure to use to represent the cache?

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• How to check if a given Regex is valid? (Java)

  - by Philipp Andre

  Hi folks, I have a little program allowing users to type-in some regular expressions. afterwards i like to check if this input is a valid regex or not. I'm wondering if there is a build-in method in Java, but could not find such jet. Can you give me some advice? Best regards Phil

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• How to check if an Object is a Collection Type in Java ?

  - by Tony

  By using java reflection, we can easily know if an object is an array. What's the easiest way to tell if an object is a collection(Set,List,Map,Vector...)?

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• Can I use a static variable from a Java class in res/values/styles.xml?

  - by neu242

  I want to refer to a static Java variable in my styles.xml, is that possible? Here's a pseudo-xml example: <style name="Artwork"> <item name="android:background">@drawable/border_{Constants.MY_COLOR}</item> </style>

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• Can I run a webpage-embedded Java Applet on the iPhone's web browser?

  - by Warlax

  Can I run a Java applet that's been embedded in an or HTML tag on an iPhone? I don't mean as an App but actually through its browser.

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• Does the for foreach construct in java create a hard or soft copy?

  - by Doug

  Say I have the following piece of java code ArrayList<Double> myList = new Double[100]; for (Double x : myList) x = randomDouble(); Does this actually modify myList or just the dummy variable? I realize I should just try this code segment out, but I think this is the sort of thing I should be able to google or search for on this site, and several queries so far have turned up nothing useful.

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• How can I add files to java app in android so I can get it path?

  - by masterkapu

  I want to add files to java app in android so I'll know their path and can access them. How can I do it? (It doesn't matter where they will be the most important is that I can access them and I'll know the relative path of the them)

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• Why is Javascript called Javascript, if it has nothing to do with Java?

  - by Neeraj

  Why Javascript is called Javascript (there is no relation between Java and Javascript) why its not called HTMLScript or XMLScript. Any historical reason for this?

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• How to cache *any* object type to memory/disk in java?

  - by Blankman

  Is there a generic way to cache any type of object (be in a java class, or a word document etc.) to memory or disk? Is simply serializing the object, and retaining the file extension (if it has one) enough to rebuild the object?

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• What is best practise in converting XML to Java object?

  - by newbie

  I need to convert XML data to Java objects. What would be best practise to convert this XML data to object? Idea is to fetch data via webservice (it doesn't use WSDL, just HTTP GET queris, so I cannot use any framework) and answers are in XML. What would be best practise to handle this situation?

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• How and where do you define your own Exception hierarchy in Java?

  - by EugeneP

  How and where do you define your own Exception hierarchy in Java? My main question concerns package location where they your Exception classes must be defined. Do we create a special package ourexceptions and put all classes inside it?

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• Do different JDK Updates produce different Java byte code?

  - by Bernhard V

  A hypothetical scenario: I've got a project whose source compliance level is specified to 1.5. Now I compile this project with two different JDKs: At first with JDK 6 Update 7 and then with JDK 6 Update 20. Do these two different JDKs produce different Java byte code, although they only differ in their Update version?

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• How can I get the invocation handler for a Java proxy?

  - by ripper234

  Given: Object innerProxy = ... Object proxy = java.lang.reflect.Proxy. newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class[]{type}, innerProxy); How can I extract the innerProxy object from proxy?

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• Do resource bundles in Java support runtime string substitution?

  - by Benju

  Can you do the following with a Java ResourceBundle? In the properties file... example.dynamicresource=You currently have {0} accounts. At runtime... int accountAcount = 3; bundle.get("example.dynamicresource",accountCount,param2,...); To give a result of "You currently have 3 accounts."

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• What is best practice in converting XML to Java object?

  - by newbie

  I need to convert XML data to Java objects. What would be best practice to convert this XML data to object? Idea is to fetch data via a web service (it doesn't use WSDL, just HTTP GET queries, so I cannot use any framework) and answers are in XML. What would be best practice to handle this situation?

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• How to get number of attributes in a java class?

  - by llm

  I have a java class containing all the columns of a database table as attributes (member variables) and corresponding getters and setters. I want to have a method in this class called getColumnCount() that returns the number of columns (i.e. the number of attributes in the class)? How would I implement this without hardcoding the number? I am open to critisims on this in general and suggestions. Thanks.

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• Which Java ORM is considered the most performant generally speaking?

  - by Blankman

  Which Java ORM is considered the most performant generally speaking? I realize this could mean less features, but just want an idea.

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• How can I create a bar in the bottom of a Java app, like a status bar?

  - by paintrick

  I am in the process of creating a Java app and would like to have a bar on the bottom of the app, in which I display a text bar and a status (progress) bar. Only I can't seem to find the control in NetBeans neither do I know the code to create in manually. Thank you so much for helping! Paintrick

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• does java have an in-built Antivirus? is it true?

  - by androidbase Praveen

  Does the Java have an in-built antivirus? One of my friends told me there is in the JDK itself - it's called the "sandbox". Is it true?

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• Is it a good idea to use unicode symbols as Java identifiers?

  - by Eric

  I have a snippet of code that looks like this: double ?t = lastPollTime - pollTime; double a = 1 - Math.exp(-?t / t); average += a * (x - average); Just how bad an idea is it to use unicode characters in Java identifiers? Or is this perfectly acceptable?

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• How to sort a Map<Key, Value> on the values in Java with google collections ordering function

  - by chris-gr

  How to sort a map(?,B) on the values in Java with google collections ordering function, if B is a class, which has a field of type double, which should be used for ordering.

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• Any reason to clean up unused imports in Java, other than reducing clutter?

  - by Kip

  Is there any good reason to avoid unused import statements in Java? As I understand it, they are there for the compiler, so lots of unused imports won't have any impacts on the compiled code. Is it just to reduce clutter and to avoid naming conflicts down the line? (I ask because Eclipse gives a warning about unused imports, which is kind of annoying when I'm developing code because I don't want to remove the imports until I'm pretty sure I'm done designing the class.)

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