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• Scala 2.8.1 implicitly convert to java.util.List<java.util.Map<String, Object>>

  - by Ralph

  I have a Scala data structure created with the following: List(Map[String, Anyref]("a" -> someFoo, "b" -> someBar)) I would like to implicitly convert it (using scala.collection.JavaConversions or scala.collection.JavaConverters) to a java.util.List<java.util.Map<String, Object>> to be passed the a Java method that expects the latter. Is this possible? I have already created the following method that does it, but was wondering if it can be done automatically by the compiler? import scala.collection.JavaConversions._ def convertToJava(listOfMaps: List[Map[String, AnyRef]]): java.util.List[java.util.Map[String, Object]] = { asJavaList(listOfMaps.map(asJavaMap(_))) }

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• how to code multiple button navigation with java activities [migrated]

  - by user1738212

  Question 1: I have 2 activities. I was wondering how to optimize it. I can either create 2 activities with multiple listeners. Or create multiple java files for each button(onclick listener) Question 2: I have tried to create multiple listeners in one java but can only get one button to work. What is the syntax for multiple listeners in one java file? Here is my *updated code: now the issue is no matter what button is clicked on it leads to the same page. package install.fineline; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.widget.Button; import android.view.View; import android.view.View.OnClickListener; public class Activity1 extends Activity2 { Button Button1; Button Button2; Button Button3; Button Button4; Button Button5; Button Button6; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fineline); addListenerOnButton(); } public void addListenerOnButton() { final Context context = this; Button1 = (Button) findViewById(R.id.autobody); Button1.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { Intent intent = new Intent(context, Activity1.class); startActivity(intent); } }); Button2 = (Button) findViewById(R.id.glass); Button2.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(context, Activity1.class); startActivity(intent); } }); Button3 = (Button) findViewById(R.id.wheels); Button3.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(context, Activity1.class); startActivity(intent); } }); Button4 = (Button) findViewById(R.id.speedy); Button4.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(context, Activity1.class); startActivity(intent); } }); Button5 = (Button) findViewById(R.id.sevan); Button5.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(context, Activity1.class); startActivity(intent); } }); Button6 = (Button) findViewById(R.id.towing); Button6.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(context, Activity1.class); startActivity(intent); } }); }} activity2.java package install.fineline; import android.app.Activity; import android.os.Bundle; import android.widget.Button; public class Activity2 extends Activity { Button Button1; public void onCreate1(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.autobody); } Button Button2; public void onCreate2(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.glass); } Button Button3; public void onCreate3(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.wheels); } Button button4; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.speedy); } Button Button5; public void onCreate5(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.sevan); } Button Button6; public void onCreate6(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.towing); }}

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• Java Champion Stephen Chin on New Features and Functionality in JavaFX

  - by janice.heiss(at)oracle.com

  In an Oracle Technology Network interview, Java Champion Stephen Chin, Chief Agile Methodologist for GXS, and one of the most prolific and innovative JavaFX developers, provides an update on the rapidly developing changes in JavaFX.Chin expressed enthusiasm about recent JavaFX developments:"There is a lot to be excited about -- JavaFX has a new API face. All the JavaFX 2.0 APIs will be exposed via Java classes that will make it much easier to integrate Java server and client code. This also opens up some huge possibilities for JVM language integration with JavaFX." Chin also spoke about developments in Visage, the new language project created to fill the gap left by JavaFX Script:"It's a domain-specific language for writing user interfaces, which addresses the needs of UI developers. Visage takes over where JavaFX Script left off, providing a statically typed, declarative language with lots of features to make UI development a pleasure.""My favorite language features from Visage are the object literal syntax for quickly building scene graphs and the bind keyword for connecting your UI to the backend model. However, the language is built for UI development from the top down, including subtle details like null-safe dereferencing for exception-less code."Read the entire article.

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• Would Java programmers hire C# programmers?

  - by Linx

  I learned and used Java in college. After graduating, I got a job in C#. Two years after, there are a lot more positions in Java. Would I have a good chance to be hired as a Java programmer? What interview questions would I be asked? Update (07/10/2012): Thank you for all your answers and comments. I really appreciate it. I had a chance to work on a Java project for 9 months. It was with a mix of Perl because we were trying to migrate from Perl to Java. Eclipse has definitely improved a lot. I used Maven and Spring MVC. Pretty fun. So, after the project ended, I did Ruby on Rails. That was a year-long fun project also. Two years later, I am back to .NET. Overall, being a programmer has been very sweet. Wouldn't trade it for anything else!

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• Java PlayFramework & Python Django GAE

  - by Maik Klein

  I already know Java, C# and C++. Now I want to start with web development and I saw that some really big sites are built with Python/C++. I like the coding style of Python, it looks really clean, but some other things like no errors before runtime is really strange. However, I don't know what I should learn now. I started with Python but then I saw that Google App Engine also supports Java and the PlayFramework looks amazing too. Now I am really confused. Should I go with Python or Java? I found the IDE for Python "PyCharm" really amazing for web development. Does Java have something similar, eclipse maybe? I know that this question isn't constructive, but it will help me with my decision. What are pro and cons of both languages?

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• Thoughts on the new JavaFX by Jim Connors

  - by Jacob Lehrbaum

  First, a brief editorial if I may.  The upcoming JavaFX 2.0 platform has been getting overwhelmingly positive reaction from the community so far.  While the public sentiment seems to be cautiously optimistic, I've heard nothing but positive reactions from everyone that I've spoken to about the platform.   In fact, many of the early adopters of JavaFX have told us directly that they are very encouraged about the direction the platform is taking.One such early adopter is Oracle's own Jim Connors.  As his day job, Jim is a principal sales consultant (basically an engineer that supports Oracle's sales efforts) in the New York area.  However, Jim also co-wrote a book with Jim Clarke and Eric Bruno on JavaFX and has spoken and conducted training sessions at events like the New York Java Developer Day, the Java Road Trip, and other events.In his thoughtful editorial, Jim discusses some of the reasons why he believes the new directions Oracle is taking JavaFX make sense, including:Better developer toolsLower barriers to adoption -> better accessibility to existing Java developersImproved performanceMore flexibility (ability to use other dynamic languages, etc)To read more about Jim's thoughts on the new JavaFX, check out his blog.  Or if you want to learn more about the JavaFX platform, pick up a copy of his book.  And if you still want to use JavaFX Script, you can check out Project Visage

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• What’s Outt Showcases What’s New in Theaters, TV, Music, Books, Games, and More

  - by Jason Fitzpatrick

  It’s tough to keep on top of all the new media that comes out; What’s Outt gathers current and future releases for everything from in-theater movies to console games. You can check out the current week, up to two weeks into the future, and–if you’re a bit behind the new release wave–you can page your way back through the archives to catch up. In addition to the web interface, What’s Outt has a simple once-a-week mailing list to keep you updated on the newest releases across all the categories they tracks. What’s Outt [via MakeUseOf] How to Own Your Own Website (Even If You Can’t Build One) Pt 2 How to Own Your Own Website (Even If You Can’t Build One) Pt 1 What’s the Difference Between Sleep and Hibernate in Windows?

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• Save 10% when you by this Java mascot stress toy

  - by hinkmond

  That's right! Attention Java online shoppers! We have a blue-light special for a limited time. Buy a squishy Duke stress reliever toy and get 10% off. See: Java mascot stress toy Here's a quote: Polyfoam stress toy is shaped like Java mascot, Duke. 2-1/4" x 3-1/2" x 1-3/4". Custom mold. Red/White/Black. Stress Reliever Toy? Now, why would you be stressed out if you're a Java technology fan..? Don't answer that. Hinkmond

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• Sony Ericsson txt: workhorse feature phone with Java ME tech

  - by hinkmond

  Just like your basic Quarter Horse, the new Sony Ericsson txt feature phone might not be as fancy as a "thoroughbred" smartphone, but it can sure get the job done with Java ME technology. See: Sony Ericsson txt w/Java ME Here's a quote: ...comes with the usual features such as a web browser, email client and music player and FM radio, plus support for social networking applications and a YouTube client. You can download and install additional Java applications... Sometimes the simple workhorse feature phone (with Java ME) is much better to go with than the idiosyncratic thoroughbred smartphone. Hinkmond

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• Jobs, jobs, jobs, jobs: in Java technology (3/2012)

  - by hinkmond

  If you're looking for an opportunity to work on the latest Java technology, we have some job openings on our team. We are currently planning some pretty cool projects that you would work on! See Java Technology Jobs at Oracle: Req IRC1722640 Req IRC1722647 Req IRC1722654 So, check it out. You'll get the opportunity to program Java devices, work on cutting edge embedded platforms, and a get an assigned free blog at the Oracle blog site too. Won't that be fun? Hinkmond

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• Upgrading in java web development

  - by Vladimir Ivanov

  I'm a java web developer for nearly 3 years. Always trying to learn more and be better but still I feel that the amount of knowledge is not that good as I want. The knowledge in some places still seems to be non-systematic and don't provide a very strong base to solve the problems as good as I want to do it. The example I have is my senior developer, whose solutions are always more efficient and beautiful. So, the question is rather simple and hard the same time. What is the right way to get my knowlege be more systematic and therefore improve it's quality. I understand that there is no practically good answer for the all java programming, so let's focus on the modern java web or nearly web technologies: JSF 2.0 JPA2 and Hibernate as persistence provider Web services and Java SE as a core. What methodologies or books or learning technics lead to the strong knowledge base within the given knowledge area?

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• Pathfinding Java library

  - by Shivan Dragon

  I'm an amateur game developer and somewhat amateur Java developer as well. I'm trying to find a way to have path finding for my game(s). I've first googled for some existing Java libraries that have various path-finding implementations, but I've failed to find any. It seems to me that the only way to get pathfinding code is to use it via a game engine (like Unity). But I'd just like to have a library that I can use and make the game loop and other stuff on my own. Failing to find such a library I've tried implementing some algorithms myself. I've managed to make a running AStar in Java, but for fancier stuff like DStar I find it hard to do it by hand. So then, my question is, are there any Java libraries that contain at least some basic pathfinding algorithms implementations?

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• What is the story behind Java Vulnerabilities?

  - by Maryam

  I always appreciated the Java language. It is known as a very secure platform and many banks use it in their web applications. I wanted to build a project for my school and I discussed the options with some developers. However, one of them said we should ignore Java ecause of vulnerabilities appreared recently in it. For this reason I want to make sure, what is the story behind this and does that mean that Java today considered not much secure as it was previously?

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• java+netbeans+mysql+ubuntu 64 bits LTS VS C#+MS SQL for fast develop trading system

  - by crunchor

  I am going to build a trading system and use with the broker "Interactive Broker" API. The API supports C++ Socket, Java Socket, DDE, Active X APIs in Windows. The API supports Java Socket API, Posix C++ Socket API in Unix kind like Ubuntu. My trading system has some real time long calculations to do and a lot of maths for backtest. I am using a retail trading program Amibroker which is written in C++ and I run it in windows xp 32 bits, it will take me days to do one serious backtest with my G620 Sandy Bridge CPU and 3GB of ram. So for my trading system, I need to have 1. speed, 2. stability, 3. fast development I have done some research, C++ is fastest but I am not good at it and it takes much longer time to develop. Other than C++, Java in linux has the best speed. I also did some research for database and look like mysql has the best speed. Mysql and PostgreSQL both are very popular open source sql db, which one should I choose? I see MySQL has Workbench now which looks like similar to MS SQL management studio so look like a good start. Netbeans should be the most popular Java IDE now and seem like its GUI design can be as easy as Virtual Studio now. I am not sure if made by Netbeans would affect the speed and if its GUI design is really that good and easy to use. Ubuntu 64 bits LTS has good long term support, good community support, and stable. I will buy a new computer if I can create a good trading system for live trading and backtest. Very likely I will buy a I7 or I5 depends on if I7 can really have better speed for my case. Actually I mainly deal with C# in my jobs and I just knew java but not good at java. What would you guys recommend? Any better solution? This will be a big project and very likely life long project for me so I seriously do research including asking you guys before I start and focus on what I should, thanks!

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• Fonts look horrible in any java application

  - by Eirik Berg

  All fonts in java applications look horrible. I have seen a few questions about this previously, but they are quite old now(11.04 was the most recent, but that didn't seem to be the same problem). For some reason java applications do not use the system font (Ubuntu 11), but rather some elongated font that doesn't seem to have any anti-aliasing. So what I'm asking is if this is an open bug(couldn't find any on launchpad), something the developers have done wrong, or if there is a way to configure the fonts used in java application. Perhaps this is just a shortcoming of openjdk and I should install the Sun version instead? Attached an image showing jitsi, but the problem is also present in minecraft, my internet-bank and anything else involving java. I'm on 12.04, but since I couldn't find anything on launchpad I'm assuming that isn't relevant. Edit: actually managed to forget the picture... Thanks!

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• Should Swing knowledge be required from Java programmers?

  - by Anto

  Swing is an integral part of the Java API. It is also the most popular GUI framework for Java. I still wonder, should every Java programmer still know, or at least be pretty familiar with, Swing (possibly excluding web developers)? There are alternatives (e.g. SWT), but they are not very widely used (compared to Swing). What do you think about requiring Swing knowledge from Java programmers? If such knowledge is important, to what degree? Are the basics enough or not? The reason I wonder is because I really don't like Swing but wonder if I still should brush up my skills in it. I'm able to create simple GUIs in it, but I would definitely not say that I know Swing well.

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• Should Swing knowledge be required from Java programmers?

  - by Anto

  Swing is an integral part of the Java API. It is also the most popular GUI framework for Java. I still wonder, should every Java programmer still know, or at least be pretty familiar with, Swing (possibly excluding web developers)? There are alternatives (e.g. SWT), but they are not very widely used (compared to Swing). What do you think about requiring Swing knowledge from Java programmers? If such knowledge is important, to what degree? Are the basics enough or not? The reason I wonder is because I really don't like Swing but wonder if I still should brush up my skills in it. I'm able to create simple GUIs in it, but I would definitely not say that I know Swing well.

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• Java HttpURLConnection class Program

  - by pandu

  I am learning java. Here is the sample code of HttpURLConnection class usage in some text book import java.net.*; import java.io.*; import java.util.*; class HttpURLDemo { public static void main(String args[]) throws Exception { URL hp = new URL("http://www.google.com"); HttpURLConnection hpCon = (HttpURLConnection) hp.openConnection(); // Display request method. System.out.println("Request method is " + hpCon.getRequestMethod()); // Display response code. System.out.println("Response code is " + hpCon.getResponseCode()); // Display response message. System.out.println("Response Message is " + hpCon.getResponseMessage()); // Get a list of the header fields and a set // of the header keys. Map<String, List<String>> hdrMap = hpCon.getHeaderFields(); Set<String> hdrField = hdrMap.keySet(); System.out.println("\nHere is the header:"); // Display all header keys and values. for(String k : hdrField) { System.out.println("Key: " + k + " Value: " + hdrMap.get(k)); } } } Question is Why hpCon Object is declared in the following way? HttpURLConnection hpCon = (HttpURLConnection) hp.openConnection(); instead of declaring like this HttpURLConnection hpCon = new HttpURLConnection(); Author provided the following explanation. I cant understand Java provides a subclass of URLConnection that provides support for HTTP connections. This class is called HttpURLConnection. You obtain an HttpURLConnection in the same way just shown, by calling openConnection( ) on a URL object, but you must cast the result to HttpURLConnection. (Of course, you must make sure that you are actually opening an HTTP connection.) Once you have obtained a reference to an HttpURLConnection object, you can use any of the methods inherited from URLConnection

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• What is the exception in java code? [closed]

  - by Karandeep Singh

  This java code is for reverse the string but it returning concat null with returned string. import java.util.*; import java.util.logging.Level; import java.util.logging.Logger; public class Practice { public static void main(String[] args) { String str = ""; try { str = reverse("Singh"); } catch (Exception ex) { Logger.getLogger(Practice.class.getName()).log(Level.SEVERE, null, ex); System.out.print(ex.getMessage()); }finally{ System.out.println(str); } } public static String reverse(String str) throws Exception{ String temp = null; if(str.length()<=0){ throw new Exception("empty"); }else{ for(int i=str.length()-1;i>=0;i--){ temp+=str.charAt(i); } } return temp.trim(); } } Output: nullhgniS

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• What do you think was a poor design choice in Java

  - by Phobia

  Java has been one of the most (the most?) popular programming languages till this day, but this also brought controversy as well. A lot of people now like to bash Java simply because "it's slow", or simply because it's not language X, for example. My question isn't related to any of these arguments at all, I simply want to know what you consider a design flaw, or a poor design choice in Java, and how it might be improved from your point of view. Something like this.

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• Opera Mini 7 launch to turn Java ME phones into smart browser phones

  - by hinkmond

  Here's a good way to smarten up your Java ME smart-challenged phone. Use the new Opera Mini 7 browser to view your personalized "Smart Page". See: Opera Mini 7 w/Java ME Here's a quote: The browser comes with a new feature called 'Smart Page'... a one-page summary of all the news from your Facebook and Twitter feeds. In addition to showing your friends' status updates and tweets, Smart Page will offer up suggestions for news sites to follow, and... save you the hassle of manually typing Web addresses into your mobile keyboard. ... Opera Mini 7 is available as a free download for Java-compatible (J2ME), Nokia S60, and Blackberry devices at m.opera.com That's smart! Using Java ME means you don't have to deal with those other platforms. Hinkmond

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• Jdk 6.0 update 6 installed sucessfully but java command not working

  - by Ravi.Kumar

  I switched to linux (Ubuntu 12.04) this morning and find it great but messed up while installing java. :-(. I have installed jdk6.0_6 successfully but when I run java command in terminal, I get this ravi@ravi-LIFEBOOK-AH531:~$ java The program 'java' can be found in the following packages: * default-jre * gcj-4.6-jre-headless * openjdk-6-jre-headless * gcj-4.5-jre-headless * openjdk-7-jre-headless Try: sudo apt-get install <selected package> Could someone help me with this? Below are the steps that I followed to install: copied file named jdk-6u6-linux-x64.bin to my documents from terminal executed chmod a+x jdk-6u6-linux-x64.bin and then executed sudo ./jdk-6u6-linux-x64.bin In terminal I accepted the license agreement and done.

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• UML Class diagrams with Java packages?

  - by loosebruce

  I am trying to model in UML 2.0 a Java servlet application that has three classes Servlet class; essentially a main class that acts as the controller DatabaseLogic; contains methods for database operations XMLBuilder; builds an XML from a query result string The classes use a variety of packages from the Java library. I am unsure how to model this in UML Do I have to create a package and show which libraries are used for each individual class or can I just have one large package in the diagram with all the libraries showing which classes have dependencies on which. As per this diagram This is my first time working with java properly (im a C++ guy) Apart from being a bit messy , is this a correct UML representation of the system I described? Does a Package in UML mean the same as a Package in Java?

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• Using XSLT for messaging instead of marshalling/unmarshalling Java message objects

  - by Joost van Stuijvenberg

  So far I have been using either handmade or generated (e.g. JAXB) Java objects as 'carriers' for messages in message processing software such as protocol converters. This often leads to tedious programming, such as copying/converting data from one system's message object to an instance of another's system message object. And it sure brings in lots of Java code with getters and setters for each message attribute, validation code, etc. I was wondering whether it would be a good idea to convert one system's XML message into another system's format - or even convert requests into responses from the same system - using XSLT. This would mean I would no longer have to unmarshall XML streams to Java objects, copy/convert data using Java and marshall the resulting message object to another XML stream. Since each message may actually have a purpose I would 'link' the message (and the payload it contains in its properties or XML elements/attributes) to EXSLT functions. This would change my design approach from an imperative to a declarative style. Has anyone done this before and, if so, what are your experiences? Does the reduced amount of Java 'boiler plate' code weigh up to the increased complexity of (E)XSLT?

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• No Android SDK, neither Java found

  - by Alex

  I have Java installed correctly, I did it by the manual http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux I also installed Android SDK. However when I try to create a new Project IntelliJ Idea 12 and specify Project SDk choosing New - /home/alex/android-sdk-linux , it says me No Java SDK of appropriate version found. In addition to the Android SDK, you need to define a JSDK 1.5, 1.6 or 1.7 What did I miss?

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