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• Comparing the values of two generic Numbers

  - by PartlyCloudy

  I want to compare to variables, both of type T extends Number. Now I want to know which of the two variables is greater than the other or equal. Unfortunately I don't know the exact type yet, I only know that it will be a subtype of java.lang.Number. How can I do that? Thanks!

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• Can I Define Exceptions to Eclipse cleanup rules?

  - by Henrik Paul

  Most often the cleanup rules (Preferences Java Code Style Clean Up) in Eclipse work perfectly and create nice-looking code. But sometimes, especially with comments and concatenated string snippets (like inline SQL queries), the cleanup just messes things up, and destroys my formatting. Is there a way to say to Eclipse "Don't touch this block of text! I have formatted it just the way I like, and you would make it just less readable"?

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• How can we generate email failure notice ?

  - by Anu

  How can we generate email failure notice in java if the email is not delivered due to issues like email address does not exists or delivery failure etc.... something like yahoomail notifications Thanks

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• malformed url exception

  - by Bunny Rabbit

  https://twitter.com/sessions?authenticity_token=b1b43178e09c1e6ccec1b3183f1f139f39643aaf&session%5Busername_or_email%5D=ddddd&session%5Bpassword%5D=rrrrr&q=&site_action=https%3A%2F%2Ftwitter.com%2Fsessions&serialized_string=Hello why is this url throwing a java.net.MalformedURLException??

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• Scanner method to get a char

  - by bizarrechaos

  What is the Scanner method to get a char returned by the keyboard in Java. like nextLine() for String, nextInt() for int, etc.

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• How can I convert IPV6 address to IPV4 address ?

  - by newbie

  I have application that uses IPV4 addresses (it stores them as long), so it only understands IPV4 addresses. Is it possible to convert IPV6 address to IPV4 with Java?

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• Is there any way static block is executed more than once? if so then how?

  - by learner

  My Understanding Static block is executed during class loading, If a class is already loaded then there is no way to load the class other than class reloading Doubt/Question 1) Is there any time JVM reloads the class? My Understanding In Class Loading JVM loads source of the Java file, so it can not keep all thousands files source is a memory, it should discard the rarely used code and reload again when it is necessary and during reload JVM is not initializing static variables and locks again(may be using some tracking mechanism) Doubt/Question 2) If my above understanding is incorrect then please correct me

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• Difference between a Deprecated and an Legacy API?

  - by Vaibhav Bajpai

  I was studying the legacy API's in the Java's Collection Framework and I learnt that classes such as Vector and HashTable have been superseded by ArrayList and HashMap. However still they are NOT deprecated, and deemed as legacy when essentially, deprecation is applied to software features that are superseded and should be avoided, so, I am not sure when is a API deemed legacy and when it is deprecated.

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• Feature set of a CMS and frameworks

  - by James P.

  Most people have heard of a Content Management Systems. However, what basic features should an application contain so it can be considered as a true CMS? Also, what Java frameworks could be used to make one?

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• Dynamic Cocoon Block list

  - by Crischan

  Hi, I have a Cocoon 2.2 based application which uses blocks for different tasks and one block for shared pipeline fragments. All blocks are mounted within an Cocoon webapp. Now I would like to have an block which generates an overview of all other mounted blocks. I probably will have to use Java code - which is fine - but I am kinda lost where to start. Can anyone point me the right direction?

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• Singleton Pattern Implementation Issues?

  - by locky28

  Hi I am revising for an exam and need to know some implementation issues with the singleton pattern. they do not need to be too complex just basic things that would affect a developers decision to include them, Thanks P.S. Could any code examples be given in Java thanks.

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• Converting double[][] in to float[][]

  - by cer_albastru

  Hi, I was wondering if there is a way of converting a double [][] in to a float[][] in Java? I currently have a for loop in my code that does this and am looking for a better and cleaner way. Any ideas would be appreciated, Thanks,

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• Is there a possability that method executes only once

  - by Gandalf StormCrow

  I have a for loop and structure like this : for(....) .... .... if(isTrue) ... do something.. .. method to be executed once (doTrick) is declared outside for loop. ....endif endfor public void doTrick() ... ... ..end Is it possible for a method in for loop to be executed only once? I'm using JAVA

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• examples of good concurrent programs meant to scale

  - by vishr

  I am looking for seminal and excellent examples of libraries and projects that emulate the good practices of the Java Concurrency in Practice book. The book is marvelous. However, I think supplementing this book reading with code reviews of projects and libraries that make use of the concurrency APIs effectively is necessary to drive the concepts into the brain. One good example of what I am looking for is https://code.google.com/p/concurrentlinkedhashmap/ Can folks help me with finding exemplary, well written code that use the concurrency api well?

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• Is there anything else other than class, interface or Enum?

  - by GK

  As we know to generate a class file there should be atleast one class or interface or an Enum should be declared in the java file. So i was curious that is there anything else as well other the mentioned which can cause a class file generation. Or did anybody think that as we can declare the above mentioned, we can declare this(Which you think) as well ?

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• how to chose an open source library ?

  - by radi

  hi guys , when every one of us program in java he would need a library (some jars) to complete his work . so when this programmer find some libraries he need . how he can find the best of these libs ? thanks.

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• how to add new elements to a String[] array?

  - by Pentium10

  I have a Java code defined as: String[] where; /**/where.append(ContactsContract.Contacts.HAS_PHONE_NUMBER+"=1"); /**/where.append(ContactsContract.Contacts.IN_VISIBLE_GROUP+"=1"); Those two appends are not working in this form, how would that work correctly?

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• Looking for some kind of code by Contracts that I can use with Eclipse

  - by devoured elysium

  I've tried before some Eclipse plugin (I don't remember its name) but it was lacking a lot of features (generics, for example). Is there anything easy to set up that would run on the last version of Java? Thanks

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• How can I close a JFrame by click on a button?

  - by Roman

  I would like to have a button in my window such that if I click it (button) the window is closed. I found out that I can close a window in the following way: referenceToTheFrame.hide(); //hides the frame from view refToTheFrame.dispose(); //disposes the frame from memory But if I do this way, compiler complains: Note: myProgram.java uses or overrides a deprecated API Note: Recompile with -Xlint:deprication for details. Do I do something unsafe?

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• Error on MulticastSocket.joinGroup()

  - by Pedro Ghilardi

  I'm trying to execute a simple example of Multicast sockets on Java. MulticastSocket s = new MulticastSocket(6789); InetAddress group = InetAddress.getByName("230.1.1.1"); s.joinGroup(group); This code generates the error: IP_ADD_MEMBERSHIP failed (out of hardware filters?) Any idea? Thanks

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• Generic DRM (Distributed resource management) wrapper

  - by Pavel Bernshtam

  I need to write a software, which launches DRM jobs in a customer environment and monitors those jobs status. It should work with various customer environments and DRMs - like LSF, Sun Grid and others. Can you recommend some 3rd party library, which hides DRM differences from me and has API like "launch job", "get list of jobs", "get job status" etc. ? Both Java and native libraries are good for me.

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• Calling outer class function from inner class

  - by santose

  hi, I have implemented a nested class in java. And I need to call the outer class method from inner class. //Code class outter{ void show(){ SOP("outter show"); } class inner{ void show(){ SOP("inner show"); } } } How can I call the outter method "show".

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• linked-list interview question

  - by giri

  Hi This was the question asked in interview.Can anybody help me out it in implementing in java Given 2 linked lists(which need not have unique elements) find intersection point in the form of Y.(it can be anywhere--middle or tail)

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• ArrayList shallow copy iterate or clone()

  - by user222164

  I need a shallow copy of an java ArrayList, should I use clone() or iterate over original list and copy elements in to new arrayList, which is faster ?

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• transpose graph

  - by rana123

  how can i write program in java to find the transpose of the graph G, where the input and the output of the program are represented as adjacency list structure. for example: input: 12341 outout: 1432

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