Click here to Skip to main content

Submit your article

Java

Java

Great Reads

A Journey to the World of Android Wearable

by ridoy

A brief explanation of application development for Android Wear, helpful for every beginner and intermediate android developer.

Never Buy A Garage Door Remote Again: Open Your Door With Your Android Phone (via Bluetooth)

by raddevus

Steps for building a device you can add to your existing garage door, which implements an atmega328, bluetooth (hc-05) and relay module which will allow you to open your garage door from any paired Android device.

Android Programming By An Example: Creating An Airport Schedule Simulator Application

by Arthur V. Ratz

In this article, we will discuss about the advanced Android application development based on the example of creating a responsive Airport schedule simulator application.

Still Don’t Get the Difference of “Overloading and Overriding”?

by Afzaal Ahmad Zeeshan

This post attempts to describe the general difference between overloading and overriding in Object-oriented programming languages.

Latest Articles

Java Code Change Impact Analysis - Introduction to JCCI

by Oliver Li 2024

Java Code Change Impact Analysis

Wrapping Java with C++ Objects - JNI OOP

by Yochai Timmer

A way to avoid JNI's reflection oriented programming. Wrapping Java with C++

Windows / Android (C#/Java) Compatible Data Encryption with Compression

by JudyL_MD

Code sample for passing encrypted compressed data between Windows and Android

An In-Depth Tutorial on Lucene and Java

by Han Bo Sun

This is a more in-depth tutorial on integrating Lucene search and index engine in Java applications.

All Articles

Java

POSTFIX AND INFIX

7 Jan 2010 by #realJSOP

Did you try google[^]. I think not.

MultiThreading for Neural networks

11 Jan 2010 by #realJSOP

You probably can. If not, switch to a more competent language.

Reproducing old software (games)

13 Jan 2010 by #realJSOP

Become familiar with the game and then write code to duplicate its behavior. Chances are that you won't be able to get the source to most games, regardless of their current status.

public static int binarysearch() ! i dont know the correct form of it.

5 Feb 2010 by #realJSOP

That smiley you have in the code certainly won't compile...

How to generate license key of a software

15 Feb 2010 by #realJSOP

Quick answer - use a GUID.If you want more info, you have to ask a better question.

How to avoid duplicate random questions

15 Feb 2010 by #realJSOP

You could randomly select them and add them to a HashTable.The HashTable collection don't allow duplicate keys, so you could just keep retrieving randomly selected questions until your hash table contains the desired number of questions.(I'm assuming your question object has some sort...

Is there anybody that tell me the diffrence between & and &&?

5 Mar 2010 by #realJSOP

Google is your friend. I found this in another forum.'&&' and '||' are what's called "short-circuiting" logical operators.In the case of &&, if the first operand is false, then it doesn't bother evaluating the second operand, because the whole expression is certain to be false.In the...

communication between 2 different application in server with JVM

3 Apr 2010 by #realJSOP

Among 75000 other hits in google ("java interprocess communications"), I found this:http://www.javaworld.com/javaworld/javaqa/2000-03/03-qa-0324-ipc.html[^]

Is there any OPEN Source code for OPC client in Java?

19 Apr 2010 by #realJSOP

Did you by chance google it? That would be the first thing I would do.

Not enough storage is available to complete this operation

19 Apr 2010 by #realJSOP

Are you calling GC.Collect in your web page? If so, comment that out and see if your web page runs more reliably.By the way, you might also want to consider doubling the amount of RAM in the box.

Encryption compatible with Java and ASP.NET

12 May 2010 by #realJSOP

You're going to have to write one routine in Java, and then one routine in .Net. As long as you use the same encryption algorithm with the same vectors and keys, the result should be the same. The same holds true for decryption.

Want to create a tracking system

18 May 2010 by #realJSOP

The very first thing you need to do is think of a really cool name. Something along the lines of "ICantGoogleSoHowDoYouExpectMeToBeAbleToReadAMap". No, wait... that's WAY too long. Maybe "ImACluelessRetardAndICantGetUp". Nah, I think that one is too long as well. How about...

AForge.Net

19 May 2010 by #realJSOP

If you want to contact an article author about their article, use the forum for that article.

Creating scheduler with recovery system

7 Jun 2010 by #realJSOP

Your best bet is to maintain some sort of progress file (I would probably use a XML file).When the job is about to start, put the job identifying info into the file, and when the job is successfully completed, remove the info. If the job fails, you can restart it based on the info in the file.

Application logger

24 Jun 2010 by #realJSOP

Most non-consumer-grade routers/frewalls handle this, and the resulting logs can usually be configured to be emailed to an appropriate authority. There is absolutely no need to write code to perform this task.

Wanna knw how to build this Virtual Reality App!

1 Jul 2010 by #realJSOP

Quick Answers is for asking programming questions about code you're hacving a problem with, and is NOT a forum for diuscussion about projects you'd like to build. There's probably an appropriate forum on this site for this kind of thing, but Quick Answers is NOT it.

Need an idea! Please help me....

13 Jul 2010 by #realJSOP

Do you even know what "client-server" means?

Cloud computing

3 Aug 2010 by #realJSOP

First, you need to acquire a cloud, and not just any cloud, but a Microsoft-certified cloud. Don't be fooled by clouds you see just floating by, unencumbered by mere mortals. You're looking for a higher tech kind of cloud utilizing the latest in adherant water vapor technology. Personally, i...

Operating system

3 Aug 2010 by #realJSOP

Resource allocation is best achieved will sitting on a fully Class 7 compliant commode.

Converting Image to Text

24 Sep 2010 by #realJSOP

Just convert the image buffer bytes to string representations of those bytes. There's even an object that does it for you in .Net. No, I don't remember exactly what it's called, but google is amazingly easy to use.

change mail address

4 Oct 2010 by #realJSOP

If you're talking about yothe email address you used to register for CodeProject, look ain the top/right corner of this page. You'll see your user ID. Hover your mouse over it, and you'll see a pop-up window. Click My Settings.You can change your email address on the resulting...

Request for Project

6 Oct 2010 by #realJSOP

I strongly suspect that if you need help coming up with a "good network project", you probably don't have the skillset necessary to implement it.

c swaping program

7 Oct 2010 by #realJSOP

Given:int a = 1;int b = 2; You can do this:a = a + b;b = a - b;a = a - b; or this: b = a ^ b;a = b ^ a;b = a ^ b; or just use the std:swap method.

Image steganography in Java

19 Oct 2010 by #realJSOP

Google is your friend. Try it, you might even like it.Nobody is going to just give you code, and demanding it this way will just keep people from responding in a positive way.

abstract classes

22 Nov 2010 by #realJSOP

Would it hurt you to try using google for questions like this? Among the more than 43 THOUSAND results returned, this was the first one:Abstract Classes vs Interfaces[^]

Server to run java servlet

27 Nov 2010 by #realJSOP

Googling this phrase - "deploy java servlet" - revelaed 500,000 hits, and the very first one has the title "Introduction to Java Servlets, Developing your first Java Servlet".Seriously dude - this is the internet, any question you might come up with has almost always been asked/answered...

web_development

24 Dec 2010 by #realJSOP

Find out who made the drivers for your web cam, and see if there's an SDK available for it, or do a google search for "C# webcam". Here's pone of the results returned:http://www.c-sharpcorner.com/UploadFile/yougerthen/810262008070218AM/8.aspx[^]

Convert byte array to base64 string

12 Jan 2011 by #realJSOP

Google knows all ("java byte array to base64"). Seriously dude, it took me all of 20 seconds to find this using google:try { // Convert a byte array to base64 string byte[] buf = new byte[]{0x12, 0x23}; String s = new sun.misc.BASE64Encoder().encode(buf); // Convert...

MS SQL CONNECTION

16 Jan 2011 by #realJSOP

I googled "java sql server connection refused", and this was the first link:http://www.websina.com/bugzero/errors/sql-server-connection-error.html[^]If that one does help, there are about 77,000 more search results to chose from.

View and operate program from inisde a program or presentation on Mac

16 Jan 2011 by #realJSOP

I think the only way you could pull this off is if the application in question could be constrained in a window that your own application creates. Since X-Plane is a game, and since most game companies would never even consider running their game in a window that wasn't borderless and full...

About Calculate... Repost

19 Jan 2011 by #realJSOP

I've not done a lot of javascript, but that last if/else statement looks suspect.

Shell-Extention in C to show or creat new directories in "MY Computer"

8 Feb 2011 by #realJSOP

We don't do homework for people. It's not that we feel like we're superior or anything, it's that you won't learn anything if we do the work for you. Make an effort to do the work yourself, and if you have a specific problem, come back and ask a question about that problem.

Need help to develop Stock Market Simulation system

18 Feb 2011 by #realJSOP

Really? Evaluate the requirements, decide on your supported platform, and choose the appropriate language/framework. Analisys part of learning how to be a programmer.

please offer me a good book for learning java

22 Feb 2011 by #realJSOP

Here's one[^]

What are Apache Struts and JBoss Hibernate

9 Mar 2011 by #realJSOP

Is google a little too much for you to handle?Struts[^]Hibernate[^]Really, it requires VERY LITTLE effort to type that into the google search bar.

how to know which software design pattern to choose ?

27 Mar 2011 by #realJSOP

Pick the one that gets the job done, or don't pick one at all. I've never consciously made a decision to use a specific "design pattern". I do what makes sense for the project, and get on with my life. I usually split the interface as much as possible from everything else, and go with it. If...

How to Use Eclipse to develop java based web application using toolbox

14 Apr 2011 by #realJSOP

You can look for documentation using google.Over 5.8 million results await your perusal[^]

internet download manager

20 Apr 2011 by #realJSOP

You given us just enough information to not be able to help you. I'm willing to bet that if you google the error that you didn't give us, you'll find an answer that we won't care about.

How do I get MAC address of a access point using java code?

22 Apr 2011 by #realJSOP

I suppose you could do a tracert and retrieve the IP address from the first reported hop in the list.

Need a idea for a program to help my resume

29 Apr 2011 by #realJSOP

One program isn't going to bolster your resume. What got me my first programming job was that I not only attended school full time (I also have a certificate, and not a degree), but that I also held down a full-time job. Yeah, your first programming gig is gonna suck as far as compensation goes,...

I need the meaning of this code

18 May 2011 by #realJSOP

it's the same as doing this:Color back;if (minaSelec){ back = Color.RED;}else{ back = Color.LIGHT_GRAY;}

what is minimum value of char in c++, c#, java

20 May 2011 by #realJSOP

Go here:http://en.wikipedia.org/wiki/Integer_(computer_science)[^]What you're talking about is a signed integer (-128 - 127).A char type is actually represented by (can be cast to) an UNsigned integer (0 - 255).

Help me for this Question please .

24 May 2011 by #realJSOP

Oranges

how to be an apple developer ?

29 May 2011 by #realJSOP

http://develop...

which is the best operating system and programming language for large film theaters video broadcasting

4 Jul 2011 by #realJSOP

You mean to replace the apps that are already in use? If you want to "know the existing technology" used in movie theaters, maybe google would be a better resource.

Code of the "Online tutor " project?

8 Jul 2011 by #realJSOP

This should explain it[^]

how to redirect localhost:8080/hostname/ to hostname.com

15 Jul 2011 by #realJSOP

What I think you're actually describing is URL rewriting[^].

How to replace " with \"

15 Jul 2011 by #realJSOP

str = str.Replace("\"", "\\\"");

can u find out the domain of my project

18 Jul 2011 by #realJSOP

Try Monster.com[^]. You are an "employer". That should help get you started finding someone to write the code for you.

What are the steps in Software Product Development Life Cycle?

17 Aug 2011 by #realJSOP

0) Cocktail napkin1) Feasibility discussion2) Planning3) Design4) Development (aka "Magic happens here")5) Testing6) Release7) Abandonment (Microsoft does this a lot)

What is mean by JAR files?

24 Aug 2011 by #realJSOP

USE GOOGLE!http://en.wikipedia.org/wiki/JAR_(file_format)[^]

Can I use div of other websites into my intranet portal

29 Aug 2011 by #realJSOP

That's not legal. An implied copyright is attached to everything that's ever published. You need to get permission from the other web site(s) to use their content, and I doubt you'll get that permission. The best you can do is to provide a link to that news story.

Need ideas for a pet project

30 Aug 2011 by #realJSOP

By definition, a "pet project" is something that you've dedicated yourself to performing/completing sometime in your lifetime, like building a boat to sail around the world, or inventing the better mousetrap. You can't realistically ask someone else to identify such a project for you.

Want to Start Android Game

1 Sep 2011 by #realJSOP

Learning how to use google is a good place to start.getting started with android development[^]

Error in syntax of subquery

2 Dec 2011 by #realJSOP

Look at your like clause. You're essentially selectiing all records from the course table, and there's no way the idteacher column is going to be "like" a dataset. I suspect (bby looking at your example) that you want to show all teachers that teach a particular course, but your query fails to...

Add 10 student into Arraylist

5 Dec 2011 by #realJSOP

Just do this:ArrayList section = new ArrayList();section.add("name1");section.add("name2");section.add("name3");...section.add("name10");0) Why are you using a method to do something as simple as adding a student name to the arraylist?1) I don't...

if condition not executing for big numbers.why? whats wrong in the code?

13 Dec 2011 by #realJSOP

Because you've commented out the line that defines a1...

using new with abstract class

16 Dec 2011 by #realJSOP

An abstract class cannot be instantiated, and that's why new doesn't work.

Suggest a mini project topic

21 Dec 2011 by #realJSOP

Go here [^]What you have failed to grasp is that part of the assignment is researching and analyzing ON YOUR OWN, to discover the trends, and come up with an appropriate project. That's part of being a developer. More often than not, you aren't part of a large team of people with...

Suggest a mini project topic

21 Dec 2011 by #realJSOP

Given the state of the industry and the world in general, how about a simple "Goodbye, World" application? Instead of greeting the user with "Hello, world!" when the app starts, wait until they close the app, and show the phrase "Goodbye, world!". This shouldn't take you more than 10 minutes to...

how to block a website using program

27 Dec 2011 by #realJSOP

You should block URLs at the firewall because software running on the client machine can be compromised.

Suggest Java Editor for programming

27 Dec 2011 by #realJSOP

135 MILLION google results for the serach phrase "java IDE"[^]

Content Based Image search

28 Dec 2011 by #realJSOP

Go here [^]It sounds like homework because 99 times out of 100, a person asking a question like this who doesn't have a grasp of the requirements is usually in school. Feel free to correct me if I'm wrong in this case.

News and updates about programming language

8 Mar 2012 by #realJSOP

Google.

How to convert java code in C#

16 Nov 2016 by #realJSOP

You could use a ready-made tool:6 Best Tools to Help You Convert Java to C# Source Code » CODECALL[^] ...or you could be a programmer and do it manually. It really isn't that tough. Most of Java even uses some of the same class names. The only thing you'd have to be concerned with are...

Object-oriented programming (OOP)

9 Jan 2017 by #realJSOP

The answer is - QA is not the place to have programming discussions. Use the various forums that exist on the site.

I want to receive the json array and store that data in SQL using C#

24 Jan 2017 by #realJSOP

Json.NET - Newtonsoft[^]

How can I write the same function by using exactly one loop

13 Apr 2019 by #realJSOP

What you need is a recursive function. java recursive functions at DuckDuckGo[^]

Convert two lines from java to C#

14 May 2019 by #realJSOP

Assuming sb2 is a StringBuilder object and you want the hex value... sb2.AppendFormat("{0:X2}{1:X2}", b1, b2));

Error: program type already present: httpclient.httpresponse

16 Jun 2019 by #realJSOP

Search engines are free to use: "program type already present" at DuckDuckGo[^]

How do I code my program, so the strings I have in my arraylist are actually removed?

11 Aug 2019 by #realJSOP

It’s because you’re re-instantiating the list each time you call the list method.

Header manipulation fortify

18 Oct 2019 by #realJSOP

Mark it as Not an issue in Fortify and move on

Secure the Application using Jquery/Javascript

15 Aug 2013 by $r!dh@r

Hi All, How we can secure the our web Application by using Jquery or java script.and if we connected to data base through java script. is this Secure or not?

Html /JAVA that checks if inventory is in stock

29 Jun 2021 by - srybczyk-

I am interested in making a website that allows users to check if a certain item is in stock or out of stock. I know that it might be JavaScript and CSS tables but I am not sure. I know people who are making python tools but I am interested in...

How to Start new Activity in Android(in AsyncTask) on Post execute use if and else statement ?

28 Mar 2014 by . _Puneet Sharma

How to Start new Activity in android (in AsyncTask) on Post execute use if and else statement ?

How do I draw lines between my JLabels?

27 Aug 2014 by .eclipseWarrior

I searched a lot on google on this subject, but just can't come out with right solution.Part of my code with JLabels created:frame = new JFrame(); frame.setTitle("New family tree"); ... JPanel panel = new JPanel(); panel.setBackground(new Color(30, 144,...

OpenNxSerialization

16 Jun 2009 by .Shoaib

Speed up object serialization in Java.

how to block print screen option in asp.net for all the browsers.

5 Dec 2014 by /\jmot

same question.Stop print Screen for all web browser[^]

What's the fastest way to learn programming for java

15 Mar 2015 by /\jmot

There are many site you can learn Anything.instead of asking here you can search Google to find...

Problem facing running a jnlp file

16 Jan 2010 by 002comp

Hi All,I am stuck executing the Java applet file using jnlp where Java is not installed. I need the plugin to be embedded so that if Java is not found, it should run automatically.I tried using this:

OMR Sheet Reader in Java

10 Apr 2013 by 007alok

I want to develop a OMR Sheet Reader in Java for examination Project but don't know where and how to start ' Guys kindly help me

ctypes is unable to load dll file using ctypes.open()

30 Mar 2011 by 01.mandar

this code works properly on my machine but when i copy it to another machine with all its prerequisite it stops at line 5: var lib = ctypes.open("C:\\myapp\\dl1.dll");function initport() {Components.utils.import("resource://gre/modules/ctypes.jsm"); var lib =...

How to make an android project in Eclipse?

19 Jan 2014 by 09hadi

I just downloaded Eclipse Keplar, followed by the Android SDK and the ADT. When going to make an android project it shows a cross against package name and theme. Also the next button is disabled. What to do?

Building a Multi-Language DB Schema

31 Jul 2012 by 0belix

Although your aproach will work, i believe the best one is to create a table to hold the primary key of a content, a second table to hold the different languages, and then a third table to hold the translations for the 1st table:ContentTable- ContentId (PK)- CreatedOnLanguageTable-...

JavaZoom - Radio Stream

10 Jul 2011 by 0Question-Mark0

Hi,i'm wondering if it's posible to stream an internet Radio-Stream with Java?I searched the inet and found a code for playing mp3 files on your pc.The plugin is called JavaZoom.import javax.sound.sampled.*;import java.io.*;public class Radio { public static void...

How do I solve of this error?

29 Dec 2021 by 0x01AA

I would suggest to change your SQL to INSERT INTO visitorslog (VisitorName, HostName, DateVisit, VisitType, TimeIn, TimeOut) SELECT VisitorName, HostName, DateVisit, VisitType, TimeIn, TimeOut FROM pvmsvisitor WHERE LogID = 1" Like Richard...

Please solve this errors

10 Apr 2022 by 0x01AA

I have no idea about Java... See the comments in the code marked with 'HERE X.)

I need to find the maximum number of points lieing on a single line.(IF possible dont use Python, c#recmommended)

19 Apr 2022 by 0x01AA

You can get some input here, it shows at least the logic, but not the final solution ;) Max Points On The Straight�Line[^] [Edit] A point not to be underestimated, which is not explained there, is to output the points sorted from start to...

Java sampled sound plays even a 1hz sound

27 Jun 2022 by 0x01AA

The pragmatic approach ... ... as soon this works one can think about to optimize it (e.g. loops instead of creating 10 Seconds of the same shape, stereo, etc.). You like to play a sinus- sound: Duration : [Sec] SampleFrequency : [Sample...

frequency-analysis

Java sampled sound plays even a 1hz sound

1 Jul 2022 by 0x01AA

***Warning*** This is my first java application after a crash course today. Take care, it is a.) inefficient b.) no naming conventions c.) simply fast and dirty But it shows the at least the steps how to build a sine sound. I have also cross...

frequency-analysis

Write a program that reads a sentence

6 Nov 2022 by 0x01AA

Start working on it and come back asking a question in case you have a specific question/problem. We will not do the work for you!

Why test cases failing?

22 Dec 2022 by 0x01AA

See also my comments to the question. Looks like you missed a small detail in your task description. There, the difference is defined as |arr[i]-arr[j]| But you are calculating the difference simply as arr[j] - arr[i] Conclution Use...

Intranet mailing system

19 Dec 2009 by 0x3c0

This isn't a homework site. If you want source code, then use Rentacoder. If you've already got the foundations of the mailing system, then you need to ask specific questions related to any problems you have.

Calculate the sum of prime numbers

20 Jan 2010 by 0x3c0

Your algorithm is going to be extremely slow. I would look into using Euler's Sieve (Wikipedia has listed it in the Sieve of Eratosthenes.)To keep the sum of a prime number in your code, just have a variable outside the loops and add i to it every time i == j. For a mathematical solution,...

Math.random() * n

23 Jan 2010 by 0x3c0

It just generates a random number between 0.0 and the multiplier, in this case 1000 or 256.

Java Netbeans Error Regarding Arraylist in BufferedWriter Method

21 Dec 2012 by 100,001

I want to write product objects per consumer to a file based on region. This is the method:protected static void writeRecordsToFiles(ProductConsumer[] consumers) { try { BufferedWriter[] bufferedWriters = { new BufferedWriter(new...

Formatting CPP, C, JavaScript and Other Stuff

5 Dec 2019 by 10xlearner

A post on how to format CPP, C, JavaScript and other stuff

What is the simplest and most efficient way to read from and write to a JSON url in java?

13 Apr 2013 by 1100Neo

I am developing an application in java from the rotten tomatoes api which uses json format. All I need to know is how can I write to a JSON url and read from a JSON url. Thanks in advance.

What is the simplest and most efficient way to read from and write to a JSON url in java?

13 Apr 2013 by 1100Neo

I searched and found this, but it seems very difficult to understand , as I am new to JAVA.http://argo.sourceforge.net/documentation.html[^]

Pass data between java and C using JNI

12 May 2021 by 15160877

I want to send an empty hashmap from java to C. After that, I need to store data from C to hashmap and again pass it to java. I can now access my java functions from C. But, now I want to pass a hashmap from java and store the data and pass the...