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• How to debug if using the java.io.Console class (netbeans).

  - by cchampion

  The java.io.Console class requires there to be a Console device (window). How can I debug if I am using this class? I'm using netbeans IDE.

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• How does + operator behaves differently with numbers and strings in Java?

  - by Abhishek Jain

  Java does not have concept of operator overloading. Still + operator behaves as addition operator with numbers and concatenate operator with strings. This is similar to the operator overloading behavior. Please suggest.

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• How can I dynamically build a Java classpath in Perl?

  - by joe

  For Example in shell script: _CLASSPATH =. for jar in lib/*.jar do _CLASSPATH=${_CLASSPATH}:${jar} done How can I dynamically build a Java classpath in Perl?

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• Is it good practice to use the XOR (^) operator in Java for boolean checks?

  - by Pete

  I personally like the 'exclusive or' operator when it makes sense in context of boolean checks because of its conciseness. I much prefer to write if (boolean1 ^ boolean2) { //do it } than if((boolean1 && !boolean2) || (boolean2 && !boolean1)) { //do it } but I often get confused looks (from other experienced java developers, not just the newbies), and sometimes comments about how it should only be used for bitwise operations. I'm curious as to the best practices others use around the '^' operator.

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• Is this possible in Java: Map<SomeObject, Map<SomeOtherObject>>?

  - by davek

  Is this possible in Java: Map<SomeObject, Map<SomeOtherObject>>? I'm trying Map<Integer, Map<String>> am getting an "Incorrect number of arguments for type Map; it cannot be parameterized with arguments " error.

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• Java: Check what processes are bound to a port?

  - by bguiz

  Hi, I am developing an application in Netbeans, and it is using JavaDB. I can connect to it and execute queries without issues, but for some reason, the "Output - JavaDB Database Process" pane within Netbeans keeps displaying Security manager installed using the Basic server security policy. Could not listen on port 1527 on host localhost: java.net.BindException: Address already in use How do I find out what process is already using, or bound to that port? On Ubuntu Karmic, Netbeans 6.7.1

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• Can anybody give me a complete list of data structure supported in Java(not in util package)?

  - by Kavin

  I want to know what kinds of data structure in Java and not in the util package? For example: Hashmap, Collection, Set. Please give me a list of them as many as possible. Thank you

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• Do you have any tips to effectively use Java Assert?

  - by user49767

  I don't see much of the developer using Java Assert, but I am very keen in using them. Could you share some tips to effectively use them?

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• Converting an int to a binary string representation in Java?

  - by ttreat31

  What would be the best way (ideally, simplest) to convert an int to a binary string representation in Java? For example, say the int is 156. The binary string representation of this would be "10011100".

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• How to check for a dynamically created file in Java?

  - by Moev4

  I have an application where I need to check for a file which may be created dynamically during my execution, I will give up after some MAX time where the file has yet to show up. I wanted to know if there was a more efficient method in Java of checking for the file other than polling for it and then sleeping every X seconds? If not what would be the most efficient manner of doing this?

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• What would PHP bring to the table for a Java Developer ?

  - by Rachel

  I am a Java EE developer working mainly with JSPs, Servlets, and frameworks like Spring. Will learning PHP be a wise decision ? What would PHP offer me ?

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• Java: 3rd libraries Fast from some package management thing?

  - by HH

  Frustrated in finding the .jar -balls like google collections or "package org.apache.commons.io;". Is there some utility to get them fast like the style-"apt-get source app"? "get-java-jar-ball-3rd source apache commons"?

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• How can I host many identical java web applications?

  - by aelkin

  Hello, I have a problem. I need to host many (tens, hundreds) of small identical JAVA web applications that have different loads during one time. I want to use Glassfish V3. Do I need to use a load balancer and clusters or something else? Advise where can I find information about similar problems and their solutions... Best regards, Alexey.

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• Java is there any IDE/Tool that can pull SQL statements out in to a file?

  - by ring bearer

  Hi is there any tool available in Java world that will parse/read a source file and pull SQL statements out in to a text file. This is a complex task given that you can write SQL statements in different fashion within the source (ex: using + sign or using .append()) or even conditional building of SQL.

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• Is there a way to the hide win32 launch console from a Java program (if possible without JNI)

  - by Erik N

  You launch a java program from a console (maybe using a .bat script). I don't want the console to remain visible, I want to hide it. Is there a simple way to do this ? Without JNI ? Thanks.

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• Having another static method as the entry point of the java program?

  - by GK

  As we all know java program will start executing from the main method of the class. So was curious to know that is there any other way by which we can make another static method as the entry point, that is can we override this property of the JVM to start with some other method than main? many of you will ask why do you want to do this? so want to make it clear that its just a curiosity to know about. And if it is there then it might help in many ways

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• Why program with php frameworks if it can be done better with rubi on rails, python or java?

  - by meyosef

  Hi, We have discussion in my job place about question (We use 1 of the php frameworks): Why program with php frameworks big web application if it can be done better with rubi on rails, python or java? Please say our opinion thanks

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• What is the best way to reuse classes from another Java project in Eclipse?

  - by Jonas

  I have multiple Java projects in Eclipse. I would like to reuse some classes in my new project from my old project. What is the best way to do that in Eclipse? I.e. is it possible to add another "project folder" to the build-path for my new project?

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• Java for-each loop - Is it possible to get the index?

  - by Amir Rachum

  Is it possible to use a for-each loop in Java and somehow still get the index of the iteration? for (Object obj : ListOfObject) { // I want to know the index of obj! }

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• What is the best way to manage unix process from java?

  - by erotsppa

  I'm looking for some simple tasks like listing all the running process of a user, or kill a particular process by pid etc. Basic unix process management from Java. Is there a library out there that is relatively mature and documented? I could run a external command from the JVM and then parse the standard output/error but that seems like a lot of work and not robust at all. Any suggestions?

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• How to communicate with a USB device under Windows and Java?

  - by Gili

  I'd like to communicate with a USB device under Windows and Java but I can't find a good library to do so. I don't want the user to have to install any extra hardware or device drivers to make this work. That is, I want to be able to interact with USB just like other Windows applications do. I am familiar with jUSB and JSR 80 but both seem to be dead projects (at least for Windows).

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• How do I make my java webservice client fetch and parse WSDL upon execution?

  - by ventolin

  I've created java webservices and clients using Netbeans. However, the clients seem to have the WSDL already 'built-in'. Is there an easy way of making my client fetch and parse the WSDL code upon execution, so that if the webservice moves to another server, the client is just invoked with a different commandline argument for where to find the webservice?

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• I want to generate following JSON dataobject using org.json.simple.JSONObject, how to do it in java?

  - by Abhishek

  Hi all, I want to genrate following JSON dataobject using org.json.simple.JSONObject, how to do it in java? { friends : [ { name: 'David', interests: 'Cooking', }, { name: 'Charles', interests: 'Hiking', }, { name: 'Mary', interests: 'Football', }, ] } If code snipet is provided then that will be really helpful! Regards, Abhi

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• In Java, is it possible for a super constructor invocation actually invoke a constructor in the calling class?

  - by John Assymptoth

  Super constructor invocation definition: [Primary.] [NonWildTypeArguments] super ( ArgumentListopt ) ; A super constructor call can be prefixed by an Primary expression. Example (taken from JLS): class Outer { class Inner{ } } class ChildOfInner extends Outer.Inner { ChildOfInner() { (new Outer()).super(); // (new Outer()) is the Primary } } Does a Primary expression exist that makes the call to super() the invocation of a constructor of the calling class? Or Java prevents that?

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• http proxy script that can handle javascript in Java ?

  - by fwfwfw

  CGIproxy works great for LAMP stack, but was wondering, is there a java class for a Http proxy that can pretty much render any HTML/Javascript ?

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