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• A good Java library for network math

  - by perilandmishap

  I'm looking for a Java library that is geared towards network math and already tested. Nothing particularly fancy, just something to hold ips and subnets, and do things like print a subnet mask or calculate whether an IP is within a given subnet. Should I roll my own, or is there already a robust library for this?

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• Hexadecimal string to byte conversion in java

  - by helpjava

  I have a hexadecimal string "41464353". I want to convert it into bytes. I know the value of this hex string in byte will be "65706783". I want this as answer. Please give me a program for this in Java.

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• Best Java thread-safe locking mechanism for collections?

  - by Simon

  What would be the least-slow thread-safe mechanism for controlling multiple accesses to a collection in Java? I am adding objects to the top of a collection and i am very unsure what would be the best performing collection. Would it be a vector or a queue? I originally thought an ArrayList would be fast but i ran some experiments and it was very slow. EDIT: In my insertion testing a Vector delared using volatile seems to be the fastest?

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• Java 7 closure syntax

  - by xdevel2000

  I download the last Java build b96- Feature Complete for testing the new JDK features but I can't figure out which syntax using for testing closures! Can I test it? Which syntax has been approved in the final release?

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• Basic Java question?

  - by LAT

  Hi I am quite new to programming, i have a question please help me. ( this question is java question but i can't remember the syntax but what i write here is mostly it.) A class Person speaks i am a person A class Student speaks i am a student Student extends from Person Person p = new Student then what is p speaking then?

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• Need of serialization in Java

  - by JavaUser

  Hi , Can anyone tell me what is the need of Serialization in Java and an example scenario to explain the need . I dont need the definition .

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• How to capture screen image with mouse pointer on it in Java

  - by solgar

  How to capture screen image with mouse pointer on it in Java? In know that i can capture screen with Robot class, but it captures screen without mouse pointer on it, so this is not an solution for me.

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• Programming Java professionally

  - by user299925

  Just seeking some advice. By profession I am primarily a front-end programmer working with ajax technologies (currently I use php as my backend language of choice). As of lately I've been looking at Java as a very good OOP language to learn and just wanted to know if you guys have any advice as to what's the best way to learn the language and achieve proficency that may some day lead to mastery.

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• NACHOS(JAVA verrsion) tutorials [setup and simple sample]

  - by sb2367

  I need to setup NACHOS java version in Linux and run some simple sample . How to setup and run simple sample ? [need some tutorials and some computer assignment with solution with NACHOS]

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• Retrieving the value of a concatenated variable within a Java FOR loop

  - by Rajat

  I have been using this "logic" in C++ and VB with success, but am tied up in Java... Simply put, public void DataProviderExample(String user, String pwd, String no_of_links, String link1, String link2, String link3) { for (int i=1;i<=no_of_links;i++) { String link = "link"+i; System.out.println(link); } Now, if the variables link1, link2 and link3 have a value of "X", "Y" and "Z" respectively, upon running this program, I get the following output - link1 link2 link3 What I want is - X Y Z Any ideas?

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• Enums in java compile error

  - by London

  Hi, I'm trying to learn java from bottom up, and I got this great book to read http://www.amazon.com/o/ASIN/0071591060/ca0cc-20 . Now I found example in the book about declaring Enums inside a class but outside any methods so I gave it a shot : Enum CoffeeSize { BIG, HUGE, OVERWHELMING }; In the book its spelled enum and I get this compile message Syntax error, insert ";" to complete BlockStatements Are the Enums that important at all?I mean should I skip it or its possible that I will be using those some day?

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• Java TokenField like Cocoa's?

  - by ShadesJeff

  Does anyone know of an existing Java component that implements a TokenField, similar to Cocoa's NSTokenField? An overview of the Cocoa control is at: http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/TokenField%5FGuide/Introduction/Introduction.html Suggestions for implementation? Thanks!

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• How to concatenate two arrays in Java?

  - by Antti Sykäri

  I need to concatenate two String arrays in Java. void f(String[] first, String[] second) { String[] both = ??? } What is the easiest way to do this?

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• confusing java data structures

  - by London

  Maybe the title is not appropriate but I couldn't think of any other at this moment. My question is what is the difference between LinkedList and ArrayList or HashMap and THashMap . Is there a tree structure already for Java(ex:AVL,Black-white) or balanced or not balanced(linked list). If this kind of question is not appropriate for SO please let me know I will delete it. thank you

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• java.util.logging.Logger overrides data

  - by Tom Brito

  java.util.logging.Logger override the file data instead of add to end of file. Is this correct? should I create 1 file for each time I initialize the app and the log system? If not, how do I set it to write to the end of the file?

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• What is the use of Java Interfaces? [closed]

  - by RayAllen

  Possible Duplicate: How will I know when to create an interface? Why do we need interfaces in Java? Instead of interface can't we write the methods directly in the class itself? Why do we need a separate interface?

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• Is there any Gmail API for Java

  - by chenxgre

  I am trying to crawling google gmail inbox and download messages into the database, is there any gmail java api can best do this job?

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• A better Java JSON library?

  - by sanity

  Can anyone recommend a good Java JSON library (better than the one from http://json.org/)? I've also found JSON-lib, which definitely looks like an improvement, but I'm wondering if there is anything that is even better than that?

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• Java lang object

  - by Neeraj

  why java Object class has two methods hashcode() and equals()? One of them looks redundant and its percolated to the bottom most derived class?

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• GC Rules : how to findout a java object is eligible for garbage collection or not

  - by JavaUser

  Hi , Anyone point me the set of defined rules to find out the eligibility for garbage collection of java objects and a simple example for that .

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• Finding Links on a Webpage with Java

  - by alan

  Using Java have the source code of a webpage stored in a string. I want to extract all the urls in the source code and output them. I am awful with regex and the like and have no idea how to even approach this. Any help would be greatly appreciated.

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• java json controller

  - by dev

  I have an Java class, like Library, that contains many fields. I want do ajax call to server and in controller's method I want to have partly initialized @RequestBody Library with only fields, which are present in json object. Please Help

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• SQL running slow when i executes thru java

  - by user270885

  I am trying to execute a query in oracle db. When i try to run thru SQLTools the query is executing in 2 seconds and when i run the same query thru JAVA it is exectuting in more than a minute. I am using a hint /*+ordered use_nl (a, b)*/ I am using ojdbc6.jar Is it because of any JARS? Please help whats causing this?

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• Java getQueryString() doesnt return hash value to me

  - by Parhs

  I am using java ee and request.getQueryString() doesnt return the #hashpart my/page?id=4#hash I am using Struts 2 Is there any solution?

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• Deploying a java program

  - by zachary

  I have a java application that I created. Now I want to give it to my friend? How do I create a deploy version of this that they can run?

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