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• How to give focus to default program of shell-opened file, from Java ?

  - by Rabarberski

  From within Java, I am opening an Excel file with the default file handler (MS Excel, in this case :-) ) using the method described in this stackoverflow question: Desktop dt = Desktop.getDesktop(); dt.open(new File(filename)); However, the Excel program doesn't get the focus. Is there any easy way to do so? Edit: There is a related stackoverflow question for C#, but I didn't find any similar Java method.

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• Easy way to convert regex to a java compatible regex?

  - by beagleguy

  hi all I have a regex defined in python/ruby/php that is like this "(forumdisplay.php\?.*page=%CURRENTPAGE%)" when I do it for java, I have to double escape that question mark to //? like so: "(forumdisplay.php\\?.*page=%CURRENTPAGE%)"; is there a function I can use to do that automatically? or would I need to change all my regexes over to work with the java regex engine? thanks

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• To read the hyperlink path of a text from Excel file via JAVA?

  - by Guru

  I have done upto reading text (String) from Excel file i could leverage the same into my JAVA. But now i have an other querry. Supposing if the text in excel is a hyperlink i need the link path of that text. Say: "hyperlink text" path manually mapped to say ("C:\Folder\iamge.jpg") I want this path in java. Can any one help me with this!

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• Is there any smart enough tool to build UML class-diagram based on not very complicated Java sources

  - by Roman

  I'm using IntelliJ IDEA and I tried its tool for building class diagram. Unfortunatelly, it draws classes from java package as well as necessary classes. That's why built diagram is very messed. Are there any more smart tool? Or, is there any way to 'turn off' drawing java classes in IDEA?

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• Best way to encode text data for XML in Java?

  - by Epaga

  Very similar to this question, except for Java. What is the recommended way of encoding strings for an XML output in Java. The strings might contain characters like "&", "<", etc.

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• Java: I want to print reverse of any String without using any predefine function?

  - by Sanjeev

  how to print reverse of String "java is object orientated language" without using any predefine function like reverse() in java? any idea.

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• Can I configure a resource path that contains java source files in eclipse?

  - by tangens

  Motivation In eclipse I'd like to configure a path as a resource path. This path contains some java files that I only want to handle as resources, i.e. I don't want eclipse to try to compile these files. I only want to read them as resources from within junit tests. Question Is there a way to configure eclipse so it won't try to compile the java files it found there?

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• How can I call a GWT RPC method on a server from a non GWT (but Java) gapplication?

  - by hansi

  I have a regular Java application and want to access an GWT RPC endpoint. Any idea how to make this happen? My GWT application is on a GAE/J and I could use REST for example but I already have the GWT RPC endpoints and don't want to build another façade. Yes, I have seen http://stackoverflow.com/questions/1330318/invoke-a-gwt-rpc-service-from-java-directly, but this discussion goes into a different direction.

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• Java NullPointerException. Why?

  - by user292844

  I am new to Java. I just read that class variables in Java have default value. I tried the following program. I was expecting to get the output as 0, which is the default value on an integer, but I get the NullPointerException. What am I missing? class Test{ static Integer iVar; public static void main(String...args) { System.out.println(iVar.intValue()); } }

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• how to pass string to a url and get the image from the webserver to the java SE application

  - by Nubkadiya

  how to pass string to a url in java. i want to download an image from a web server. before downloading a image i want to pass some values to that image then after that i want to download the image. can someone help me. in Java SE application

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• In Java, when should I use an abstract method in an interface?

  - by John Oxley

  I have the following interface in Java public interface IFoo { public abstract void foo(); public void bar(); } What is the difference between foo() and bar()? When should I use abstract? Both seem to accomplish what I want unless I'm missing something subtle? Update Duplicate of Why would one declare a Java interface method as abstract?

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• Java library for trees similar to JGraphT for graphs?

  - by lexicore

  I'm a big fan of JGraphT, a Java library for graphs. Could anyone recommend a similar Java library for trees? Preferrably FOSS. What I need is a good API, preferrably typesafe with generics which allows modelling different kinds of trees (with some user data attached to verticies/edges) and run different algorithms and operations on these trees. For instance, traverse or balance. At the moment I'm not interested in visualization of trees.

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• How to export a JAR file with a default Java heap size ?

  - by Amokrane

  Hi, In order to overcome a Java heap space problem, I need to extend the Java heap size up to 256 MB. I did it using Eclipse by passing -Xmx256m as a parameter during the execution. My problem is that I want to export my application as a JAR file. How to keep this configuration during the export? Thank you

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• Why does the Java compiler complain about a local variable not having been initialized here?

  - by pele

  int a = 1, b; if(a > 0) b = 1; if(a <= 0) b = 2; System.out.println(b); If I run this, I receive: Exception in thread "main" java.lang.Error: Unresolved compilation problem: The local variable b may not have been initialized at Broom.main(Broom.java:9) I know that the local variables are not initialized and is your duty to do this, but in this case, the first if doesn't initialize the variable?

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• Learning from Java to C... ...What is the biggest challenge?

  - by Tattat

  I had experience on Java, because of some results, I need to code in C, is it difficult to switch from Java to C? And what is the biggest different between these two languages?

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• Difference between FetchType LAZY and EAGER in Java persistence?

  - by leon

  Hi I am a newbie to Java persistence and Hibernate. What is the difference between FetchType LAZY and EAGER in Java persistence? Thanks

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• Why is the first four bytes of Java class file format is CAFEBABE?

  - by zengr

  Why is the first four bytes of Java class file format is CAFEBABE? Who named it? Your views/guesses? Source: IBM Java Programing Dynamics

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• Is there any library to represent SQL queries as objects in Java code?

  - by Pregzt

  I was wondering if there is any library that can be used to represent SQL queries as objects in Java. In the code I have plenty of static variables of type java.lang.String that are hand written SQL queries. I would be looking for library having a nice fluent API that allows me to represent the queries as objects rather than strings. Example: Query q = select("DATE", "QUOTE") .from("STOCKMARKET") .where(eq("CORP", "?")) .orderBy("DATE", DESC);

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• Does class without data member have memory footprint in java ?

  - by Silent Warrior

  My question is related to memory footprint in java for class without data member. Suppose in java I have a class which doesn't have data member and it only contains methods. So if I am creating instance of particular class then does it occupies memory in primary memory except object reference memory ?

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• Can a Java portlet be embedded in an ASP.NET page?

  - by frankadelic

  We have some portlets created by a team working on a JEE site. They would like to include one of these portlets within a site I manage, which is ASP.NET. Aside from solutions like iframes, is it possible to embed a Java portlet within an ASP.NET page? (Note: I don't have much Java/portlet experience, so please take that into consideration in your answer) UPDATE Is this relevant to my question? http://download.oracle.com/docs/cd/E13174_01/alui/devdoc/docs60/Portlets/Basics/Hello_World_Portlet_NET.htm

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• Is there any language other than Java that will work as ubiquitous on mobile?

  - by Adam Gent

  I'm trying to write a rogue-like game for my blackberry and hopefully any other phone that supports some sort of JVM. Because I use Java in my job I'm looking to write the game in another language but I cannot find a language that will work on multiple phones. Am I stuck with Java?

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• How to get only the first row from a java.sql.ResultSet?

  - by llm

  I have a ResultSet object containing all the rows returned from an sql query. I want to be able to (in the java code, NOT force it in the SQL) to be able to take a ResultSet and transform it so that it only contains 1 (the first) row. What would be the way to acheive this? Also, is there another appropriate class (somewhere in java.sql or elsewhere) for storing just a single row rather than trimming my ResultSet? Thanks!

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• What's the best source for learning how to create RESTful APIs in Java?

  - by Marius

  Hi, I'm looking for a book or any other resource that will help me learn how to create RESTful APIs in Java. Looking on Amazon, I saw that there are several solutions for RESTful Java, but I'm looking for the one that is tailored to a novice. Looking forward to getting your advices/opinions, thanks!

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• How can I prevent Java from creating hsperfdata files?

  - by c-had

  I'm writing a Java application that runs on Linux (using Sun's JDK). It keeps creating /tmp/hsperfdata_username directories, which I would like to prevent. Is there any way to stop java from creating these files?

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• Should I learn a operating system specific language or something like Java?

  - by Ben Ratajesak

  I am torn. I want to start making applications for OS X. There is a specifically under-served market that I would like to tap but I don't know if I should develop it only for the mac with Cocoa and Objective C or if I should develop it with Java and JavaFX. I guess my question is, is Java robust enough to handle the same things as Objective C on Mac and C# (.net) on Windows?

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