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• What is the difference between a stream and a reader in Java?

  - by Bragaadeesh

  Hi, Today I got this question for which I think I answered very bad. I said stream is a data that flows and reader is a technique where we read from that is a static data. I know this is an awful answer, so please provide me the crisp difference and definitions between these two with example in Java. Thanks.

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• Java: Storing information from database. What collections are appropriate?

  - by garvy

  I write an application in Java. I get form a database a table (clients) which contains fields like: name | surname | adress What is the best solution to store this data in my app? Should I create an object for each client and store these objects in a list or set? The table contains about 100 records and it's already sorted. Thanks in advance.

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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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• 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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• in java is the name of a method a string?

  - by David

  in java is the name of a method a string? why or why not? so if i have something like: public static int METHODNAME (some parameters or not) { something to do ; } is METHODNAME a string?

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• Can we run an Java app in a system without JRE?

  - by Praveen Chandrasekaran

  Hi Folks, I created an java apllication. i created the Excecutable jar and Exe files for my application. But it cant be run at a system which not installed computer. How to do it? Is there any possible to configure the JRE in the EXEcutable jar or Exe file itself? Any Idea?

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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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• 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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• Does grails support logging from the src/java classes?

  - by rainyday

  I have a grails app (v 1.1.2) the logging is working fine from the groovy classes, but I can't get it to work from within a java source... I have a class in package com.mforms.devices., it imports apache log4j, defines the logger as follows private final org.apache.log4j.Logger loggy = Logger.getLogger(this.getClass()); then refer to it later by doing loggy.error("...") my Config.groovy has the following log4j = { error 'com.mforms' root { error 'stdout', 'file' additivity = true } } What am I doing wrong?!?!

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• Does the Java Native Access API locally save the native libraries for execution?

  - by jigjig

  Hi All, I was just wondering if anyone knew whether the Java Native Access API will locally save the native libraries into a temporary location before or when loading and using native libraries?

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• Any function / method in Java to implement a "freeze panes"-like sheet?

  - by MikeG

  We are using Java and Javascript to try to display a huge sheet with freeze panes, but it is being very difficult. Does someone know about a library, method, script or something, either free or commercial, to do this? Thanks.

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• Is there a timeout for threads waiting on a synchronised method in Java?

  - by MalcomTucker

  Is there a default timeout for threads waiting on a synchronised method in Java? Some threads in my app are not completing as expected. Is there anyway to check whether threads have died as a result of timeouts?

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• How can I retrieve the amount of free RAM from a Java program?

  - by swati

  Free RAM: my target metric. Java: my tool of choice. ???: a good way to get the former using the latter.

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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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• Can anyone recommend a java FOSS server that does all the typical protocols (ssh etc).

  - by mP

  I would like to add the ability for users to telnet into my app where by they can type in commands etc. I would like a simple Java Telnet server whereby i can provide the authentication strategy.

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• How can I display a PPT file in a Java Applet?

  - by Sanjeev

  I want to open and display an existing Microsoft PowerPoint presentation in a Java Applet. How can I do that?

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• How to make switch case accept multiple data types in Java?

  - by Starx

  While using Java's switch case, it excepts only char and int, but I want to provide string cases. How to make this possible?

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• What is the best way to send data from Java to PHP?

  - by Daeyun

  I want to access a MySQL database from Java, but remote connection is disabled by the host. So I will send the data to PHP and then PHP will locally access the database. The data is pretty big (about 2~4kb) I've never done this before. What should I do?

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• in java can one have an array of variables?

  - by David

  in java can you have an array of variables? if so what is the syntax? here's an example if your confused: varint[] ArrayOfVariablesThatAreInts = new varint[#] or var[] ArrayofVariables = new var[#] is something like this legal?

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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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• Is it possible to execute binary files in java?

  - by Dimitri

  Hi, I have a list of binaries written in java, ada,C, python and I want to execute them. How to do that ? Is there any JVM binding to those languages ? Thanks for your answers

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• How can two instances of an application communicate in Java?

  - by shubhkarman

  Hello, I am developing a new Java Desktop app. Something like a media player. I want to load most of the resources in the background when the computer starts up. But the users can turn this option off form within the app or using some other utility. So, what I want to do is if a ban instance of the app is already running and the user starts the app again then I can communicate with the already running instance so that it can launch a new window?

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• How to change to a different port for Java servlet to listen ?

  - by Frank

  I use Netbeans6.7 to develop Java servlet. It defaults to port 8080. How do I change the port number to 8083 for example?

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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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• How to check if internet connection is present in java?

  - by Chris

  How do you check if you can connect to the internet via java? One way would be: final URL url = new URL("http://www.google.com"); final URLConnection conn = url.openConnection(); ... if we got here, we should have net ... But is there something more appropriate to perform that task, especially if you need to do consecutive checks very often and a loss of internet connection is highly probable?

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