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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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• 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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• 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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• 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 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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 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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• 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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• 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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• 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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• In laymans terms, what does 'static' mean in Java?

  - by Philip Strong

  I have been told several definitions for it, looked on Wikipedia, but as a beginner to Java I'm still not sure what it means. Anybody fluent in Java and idiot? Thanks in advance

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• What are good RPC frameworks between a Java server and C++ clients?

  - by Zwei Steinen

  Hi, I am looking for a RPC stack that can be used between a Java Server and C++ clients. My requirements are: Ease of integration (for both C++ and Java) Performance, especially number of concurrent connections and response time. Payload are mostly binaries (8-100kb) I found some like: http://code.google.com/p/protobuf-socket-rpc/ http://code.google.com/p/netty-protobuf-rpc/ Are there any other good alternatives?

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• Should I use java-based rewrites instead of mod_rewrite?

  - by beerbajay

  I want to implement some attractive /path/to/my/app URLs for a java application. There is already an apache instance in front of the app server, with mod_rewrite installed. Do I win anything by using a java-based rewriter like UrlRewriteFilter instead?

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• What is the most used pattern in java.io?

  - by jb

  I was asked this question recently during my job interview, and I couldn't answer it. So, what is the most used pattern in java.io and how is it used? What are other patterns used in common java libraries?

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• What's the reason I can't create generic array types in Java?

  - by devoured elysium

  What's the reason Java doesn't allow us to do private T[] elements = new T[initialCapacity]; ? I could understand .NET didn't allow us to do that, as in .NET you have value types that at run-time can have different sizes, but in Java all kinds of T will be object references, thus having the same size(correct me if I'm wrong). What is the reason?

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• HashMap as return value from Java method in R?

  - by Martin

  Hi, is it possible to return a HashMap to R with the rJava extension of R? E.g. I have a method in Java, which returns a HashMap and I want this HashMap use in R. I tried: .jcall(javaObj, "Ljava/util/HashMap", "getDbInfoMap") This doesn't work. Do I have to put everything into a String[], that I want to pass to R from Java? Or is there another possibility? Any help/info on this would be greatly appreciated.

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• Java GregorianCalendar What am I doing wrong? Wrong date?

  - by saturation

  Hello I have a problem with GregorianCalendar. What is wrong in there? How outcome is 2010/6/1 and not 2010/05/31? package test; import java.util.Calendar; import java.util.GregorianCalendar; public class Main { public static void main(String[] args) { Calendar cal = new GregorianCalendar(2010, 5, 31); System.out.println(cal.get(Calendar.YEAR) + "/" + cal.get(Calendar.MONTH) + "/" + cal.get(Calendar.DAY_OF_MONTH)); } }

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• How would one go about adding (minor) syntactic sugars to Java?

  - by polygenelubricants

  Suppose I want to add minor syntactic sugars to Java. Just little things like adding regex pattern literals, or perhaps base-2 literals, or multiline strings, etc. Nothing major grammatically (at least for now). How would one go about doing this? Do I need to extend the bytecode compiler? (Is that possible?) Can I write Eclipse plugins to do simple source code transforms before feeding it to the standard Java compiler?

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