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• How know a variable type in java?

  - by Miguel Ribeiro

  Hi. I wanted a thing like I declare a variable: String a = "test"; And want to know what type it is, i.e., the output should be java.lang.String thanks in advance

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• Is the stack garbage collected in Java?

  - by girinie

  The heap memory is garbage collected in Java. Is the stack garbage collected as well? How is stack memory reclaimed?

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• Java. Best procedure to de-serialize a Java generic object?

  - by Jake

  What is the best procedure for storing and retrieving, using native Java serialization, generic objects like ArrayList<String>? Edit: To clarify. When I serialize an object of type ArrayList<String> I'd like to de-serialize to the same type of object. However, I know of no way to cast back to this generic object without causing warnings.

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• Protected members in a superclass inaccessible by indirect subclass in Java

  - by MSumulong

  Why is it that in Java, a superclass' protected members are inaccessible by an indirect subclass in a different package? I know that a direct subclass in a different package can access the superclass' protected members. I thought any subclass can access its inherited protected members.

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• Installer/packager for a Java application for Ubuntu and SuSE

  - by Dan

  I have a Java application complied to a collection of jars that I want to make installable on Ubuntu and SuSE. I Want the installer to be able to check for the JRE, register a file association and be able to load a website on un-install. I understand Ubuntu and SuSE are based on different architectures, so is there a consistent way to do this? Does anyone have an advice on utilities to use or guides to read to help me achieve what I'm trying to do.

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• Java: Finding objects in collections.

  - by Jake

  This problem occurs over and over. I have some complicated object, such as a Cat, which has many properties, such as age, favorite cat food, and so forth. A bunch of Cats are stored in a Java Collection, and I need to find all the Cats that are aged 3, or those whose favorite cat food is Whiskas. Surely, I can write a custom method that finds those Cats with a specific property, but this gets cumbersome with many properties; is there some generic way of doing this?

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• Get query from java.sql.PreparedStatement

  - by llm

  In my code I am using java.sql.PreparedStatement. I then execute the setString() method to populate the wildcards of the prepared statement. Is there a way for me to retrieve (and print out) the final query before the executeQuery() method is called and the query is executed? I Just want this for debugging purposes. Thanks.

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• Overload the equals method in java

  - by fastcodejava

  Does anyone overload the equals method in java? The overloaded method will be public boolean equals(final MyClass myClass) This will have the benefit of having the relevant comparison part (guts of the method) in another method. Details are in this blog.

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• Converting a String to Color in Java

  - by devoured elysium

  In .NET you can achieve something like this: Color yellowColor = Color.FromName("yellow"); Is there a way of doing this in Java without having to resort to reflection? PS: I am not asking for alternative ways of storing/loading colors. I just want to know wherever it is possible to do this or not.

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• How to convince management that reformatting entire java code base is safe

  - by jtsampson

  How would one go about proving to management that a batch reformat of all .java files in a large code base (to place the code in compliance with the company's coding standards) is safe and will not affect functionality. The answers would have to appease the non-technical and the technical alike.

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• Problems related to changing the encoding of a Java file

  - by Emanuil

  I need to use a few Cyrillic characters in a Java file and in order for Eclipse to allow me to do so I need to change the encoding for that file (currently to UTF-8). Are there any possible problems that this could cause?

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• What are the Java equivalents to Linq and Entity Framework

  - by Colin Desmond

  Having played with Linq (to SQL and Objects) as well as the Entity Framework from Microsoft recently, I was wondering what the non-.Net (specifically Java) equivalents are?

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• Passing data types from Java to C (or vice versa) using JNI

  - by user277460

  Using JNI can we pass custom data types from Java to C (or vice versa)? I see a mapping of primitive datatypes to types in C however not too sure if we can send across our own data types (e.g. Send across or return an Employee object or something!).

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• Implementing parallel coordinates for multi dimensional data in Java

  - by Algorist

  Hi, I am planning to implement parallel coordinates in java using JOGL library. Do you have any other suggestions? Thank you Bala

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• ruby thread programming , ruby equivalent of java wait/notify/notifyAll

  - by Geo

  I would like to know what are ruby's alternatives to the Java methods : wait notify notifyAll Could you please post a small snippet or some links ?

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• Tool for analyzing java core dump

  - by margus

  If i make java core dump with gcore then what is the best tool to analyze it? I need to be able make jmap, jstack, jstat etc and also i need to see values of all variables. Something that can take core dump as frozen JVM.

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• add more than 30 days with Calendar's add() method in Java

  - by Haes

  Hi, I'm not quite sure what field to use when adding more than 30 days to a Java Calendar object. Is there any difference in between Calendar.DAY_OF_MONTH and Calendar.DAY_OF_YEAR? Example: GregorianCalendar d = new GregorianCalendar(); d.add(Calendar.DAY_OF_YEAR, 90); vs GregorianCalendar d = new GregorianCalendar(); d.add(Calendar.DAY_OF_MONTH, 90); Thanks.

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• How to import your own non-packaged Java classes in Jython

  - by thepandaatemyface

  I know in Jython you can do import java.util.Random as Random Random().nextInt() But if I have a class I wrote myself, how can I import it into Jython without putting the class itself in a package? If I have a testclass Test: public class Test { public void foo() { System.out.println("bar"); } } that's not inside a package. Can I even import that into jython by using something along the lines offrom Test import Test?

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• DB2 AS400 Java function always returns same value

  - by Nimrod Shory

  Hello, I am writing a user defined function to DB2 on AS/400 in Java and the strangest thing happen.. I am always getting the same result from the function even when i am changing it, even if i am dropping it and create it again and even when i specify NOT DETERMINISTIC.. Does any one have ever encountered a behavior like that?

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• .NET Attributes versus Java Annotations: Which Came First?

  - by Tom Tresansky

  I'm a .NET developer learning Java EE. These two concepts seem to serve the same exact purposes in either system. So which framework gets credit for inventing them?

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• How to make java-application standalone?

  - by elr

  I have to burn a java-application on a cd. This application have to run on every windows pc wihtout any installation (also jre shouldn't be installed) before.

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• Java: thread-safe RandomAccessFile

  - by Folkert van Heusden

  Hi, After some serious googleing I found out that the RandomAccessFile-class is not thread-safe. Now I could use one semaphore to lock all reads and writes but I don't think that performs very well. In theory it should be possible to do multiple reads and one write at a time. How can I do this in Java? Is it possible at all? Thanks!

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• Finding Last Fired time using a Cron Expression in Java

  - by a-sak

  Is there a way in Java to find the "Last Fired Time" from a Cron Expression. E.g. If now = 25-Apr-2010 10pm, cron expression "0 15 10 ? * *" (quartz) should return me 25-Apr-2010 10:15am I do not care if we use standard cron expressions (like Unix and Quartz) or less popular ones if they can fetch me the correct "Last Fired Time"

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• Java - store sensitive data

  - by Mike

  Hello. I develop application with Java. I need to store some initial configuration data in some kind of file. I want my app to be able to read this data, but I don't want user to do so. Example : application loads IP from encrypted file. User sees like "dsda@#21da@" so he won't bother doing anything :) How should I do such a thing? Thanx!

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• What Java library should I use for cryptography?

  - by Spines

  Basically I want to be able to encrypt and decrypt with AES 256. What is the industry standard library for encryption in Java? Something that has been around a long time and is tried and true.

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