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  • Which to learn first: Java/J2EE or .NET ?

    - by Eric Gustavson
    Is there an advantage to learning Java or .NET first? (ie. would the transition from J2EE to .NET be significantly easier than the reverse?) Do you think that one platform has overtaken the other in terms of industry use? (feel free to be as biased or as objective as you like) see also: Java or .NET?

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  • related to java file handling.

    - by sadia
    In Java how can I take the data of my file on my display screen? I want to use data in my file and also want that data to be displayed on my output screen when I execute my program. Can any body please help by providing me such example in Java language. Thank you!

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  • extend php with java/c++?

    - by fayer
    i only know php and i wonder if you can extend a php web application with c++ or java when needed? i dont want to convert my code with quercus, cause that is very error prone. is there another way to extend it? cause from what i have read python can extend it with c++ without converting the python code and use java with jython?

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  • Java reference storage question

    - by aab
    In java, when you pass an object to a method as a parameter, it is actually passing a reference, or a pointer, to that object because objects in Java are references. Inside the function, it has a pointer to that object which is a location in memory. I am wondering where this pointer lives in memory? Is a new memory location created once inside the function to hold this reference?

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  • java RSA Multiple Encryption

    - by user1763730
    I encrypt my message with a symmetric key and the symmetric key itself has to be further encrypted with different RSA public keys. When I tried to implement the above I got the following error: javax.crypto.IllegalBlockSizeException: The input was invalid: Invalid input length. at com.rsa.shareCrypto.j.hD.engineDoFinal(Unknown Source) at javax.crypto.Cipher.doFinal(Cipher.java:2087) at wrap1.main(wrap1.java:69) Is there a way to solve this problem ?

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  • mongodb java driver - raw command?

    - by Scott
    Is it possible to execute raw commands as javascript through the Java driver for MongoDB? I'm tired of wrapping everything in Java objects using Rhino, and would happily sacrifice performance for the convenience of passing javascript directly through to the DB. If not, I can always use sleepymongoose or something, but I don't really want to add yet another language (python) to the stack at this point. Any insights are appreciated.

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  • Deprecate in Java 1.6

    - by iano
    In Java 1.5, to deprecate a method you would: @Deprecated int foo(int bar) { } Compiling this in Java 1.6 results in the following: Syntax error, annotations are only available if source level is 1.5 Any ideas?

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  • Java projects without swing

    - by Jeff Home
    I'm quite familiar with Java and I would like to work on a project on my free time but for some reason, I just hate having to work with swing. I'm wondering what kind of Java technologies are available out there that I can use for starting a project. Thank you.

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  • Writing a script in Java?

    - by giri
    I am working with telecom company. I am familiar with Java programming language. But now I have a task to write a script, with Linux operating systems. I have to write a script for fetching data from other computer and check some conditions. How can I do that using Java?

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  • Should I focus on java or on C#

    - by Daniel
    My friend started his computer engineering studies this semester, and wants to know if he should focus on Java or C#? While I am more on the Java side of life, I don't know what to answer him unbiased, so If you can give some unbiased statements on this, this would be great.

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  • Best Java obfuscator ?

    - by Xinus
    I am developing a security software and want to obfuscate my java code so it will become impossible to reverse engineer. What is the most reliable java obfuscator ?

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  • Oracle SqlPlus Command Line: There's a way to concatenate set options?

    - by Lex
    Heya, I need to set up some SET options in Oracle SQLplus command line program each time I use it, such as SET HEADING OFF and the likes to beautify my results. I found that I always have to input each line separately so Set different options and this is becoming annoying since I need to access it many times a day. I found that there's no way to separate different SET commands with semicolumns because it doesn't accept it: SET HEADING OFF; SET LINESIZE 100; returns an error A solution could be adding them to a control script and create a shell alias, but I know control scripts execute and then exit and don't return you control over the command line. So, anybody knows another solution? Or am I missing something?

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  • How to set initial window size in Java OpenGL

    - by tommy-susanto
    Hi guys... I just built a Java OpenGL application in Eclipse... and when i was trying to export the application using EclipseP5Exporter, it requires me to initialize the window size (not viewport size, a window may contain several viewports). I already googled some solutions in the net but I can't seem to get anything useful.. I've tried the method : "glutInitWindowSize(int width, int height);" but it seems to work only in C and python openGL. even if i append the glut before the method (glut.glutInitWindowSize()) eclipse doesn't recognize that method.. So if you guys have any suggestions please let me know... Thank you....

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  • Can not set Character Encoding using sun-web.xml

    - by stck777
    I am trying to send special characters like spanish chars from my page to a JSP page as a form parameter. When I try get the parameter which I sent, it shows that as "?" (Question mark). After searching on java.net thread I came to know that I should have following entry in my sun-web.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sun-web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Sun ONE Application Server 8.0 Servlet 2.4//EN" "http://www.sun.com/software/sunone/appserver/dtds/sun-web-app_2_4-0.dtd"> <sun-web-app> <locale-charset-info default-locale="es"> <locale-charset-map locale="es" charset="UTF-8"/> <parameter-encoding default-charset="UTF-8"/> </locale-charset-info> </sun-web-app> But it did not work with this approach still the character goes as "?".

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  • How to include external classes in a GAE deployment?

    - by kodra
    I am using the Google plug-in for Eclipse and have the following problem: The project consists of a GWT based GUI talking to a server running on GAE and using JPA. Additionally there is a project to migrate the legacy data to the new datastore. Since these both project use common data model, I have extracted a set of interfaces and enums into a separate project and set the other two projects dependencies on it. The Java App project seems to work, but the GWT/GAE only works if I manually copy the classes into the WEB-INF/classes directory. Obviously this is only working when using the housted mode. Anybody knows how to configure such a multi project setup in Eclipse? Also, I am not sure if the multi project layout is the best solution. The set of common model objects is used in all 3 areas: user client (GWT project compiling standard folders client and shared) server side (providing services for GWT-RPC, uploading and different feeds) migration application (posting the legacy data to the upload servlet) What are the architectural options to keep the amount of duplicated classes on minimum?

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  • android set hidden the keybord on press enter (in a EditText)

    - by user119333
    Hi, When my user press "ENTER" on the virtual android "user validate entry!" keybord my keybord stay visible ! (Why?) Here my Java code... private void initTextField() { entryUser = (EditText) findViewById(R.id.studentEntrySalary); entryUser.setOnKeyListener(new OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (keyCode) { case KeyEvent.KEYCODE_DPAD_CENTER: case KeyEvent.KEYCODE_ENTER: userValidateEntry(); return true; } } return true; } }); } private void userValidateEntry() { System.out.println("user validate entry!"); } ... here my View <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content"> <EditText android:id="@+id/studentEntrySalary" android:text="Foo" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> Maybe something wrong on my virtual device ?

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  • javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp] error with java scheduler

    - by Morgan Azhari
    What I'm trying to do is to update my database after a period of time. So I'm using java scheduler and connection pooling. I don't know why but my code only working once. It will print: init success success javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp]. at org.apache.naming.NamingContext.lookup(NamingContext.java:820) at org.apache.naming.NamingContext.lookup(NamingContext.java:168) at org.apache.naming.SelectorContext.lookup(SelectorContext.java:158) at javax.naming.InitialContext.lookup(InitialContext.java:411) at test.Pool.main(Pool.java:25) ---> line 25 is Context envContext = (Context)initialContext.lookup("java:/comp/env"); I don't know why it only works once. I already test it if I didn't running it without java scheduler and it works fine. No error whatsoerver. Don't know why i get this error if I running it using scheduler. Hope someone can help me. My connection pooling code: public class Pool { public DataSource main() { try { InitialContext initialContext = new InitialContext(); Context envContext = (Context)initialContext.lookup("java:/comp/env"); DataSource datasource = new DataSource(); datasource = (DataSource)envContext.lookup("jdbc/test"); return datasource; } catch (Exception ex) { ex.printStackTrace(); } return null; } } my web.xml: <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <listener> <listener-class> package.test.Pool</listener-class> </listener> <resource-ref> <description>DB Connection Pooling</description> <res-ref-name>jdbc/test</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> Context.xml: <?xml version="1.0" encoding="UTF-8"?> <Context path="/project" reloadable="true"> <Resource auth="Container" defaultReadOnly="false" driverClassName="com.mysql.jdbc.Driver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" initialSize="0" jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer" jmxEnabled="true" logAbandoned="true" maxActive="300" maxIdle="50" maxWait="10000" minEvictableIdleTimeMillis="300000" minIdle="30" name="jdbc/test" password="test" removeAbandoned="true" removeAbandonedTimeout="60" testOnBorrow="true" testOnReturn="false" testWhileIdle="true" timeBetweenEvictionRunsMillis="30000" type="javax.sql.DataSource" url="jdbc:mysql://localhost:3306/database?noAccessToProcedureBodies=true" username="root" validationInterval="30000" validationQuery="SELECT 1"/> </Context> my java scheduler public class Scheduler extends HttpServlet{ public void init() throws ServletException { System.out.println("init success"); try{ Scheduling_test test = new Scheduling_test(); ScheduledExecutorService executor = Executors.newScheduledThreadPool(100); ScheduledFuture future = executor.scheduleWithFixedDelay(test, 1, 60 ,TimeUnit.SECONDS); }catch(Exception e){ e.printStackTrace(); } } } Schedule_test public class Scheduling_test extends Thread implements Runnable{ public void run(){ Updating updating = new Updating(); updating.run(); } } updating public class Updating{ public void run(){ ResultSet rs = null; PreparedStatement p = null; StringBuilder sb = new StringBuilder(); Pool pool = new Pool(); Connection con = null; DataSource datasource = null; try{ datasource = pool.main(); con=datasource.getConnection(); sb.append("SELECT * FROM database"); p = con.prepareStatement(sb.toString()); rs = p.executeQuery(); rs.close(); con.close(); p.close(); datasource.close(); System.out.println("success"); }catch (Exception e){ e.printStackTrace(); } }

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  • Adding behaviour to a set of classes

    - by devoured elysium
    I have defined an Event class: Event and all the following classes inherit from Event: SportEventType1 SportEventType2 SportEventType3 SportEventType4 Right now I will only have SportEvents but I don't know if in the future I'll want some other kind of events that doesn't even have anything to do with Sports. Later, I will want to draw some graphics with info taken from Events, and the drawing logic can be a bit complex. But, for the moment, I think I shouldn't think of how the drawing will be done and I believe that maybe it'd be better if that drawing part was not put as an integral part of the Event/SportEventX class chain. I am looking for solutions for this problem. I know I could just make Event have an instance variable(attribute, for the java crowds) pointing to something as an IDrawInterface, but that would make the Event class "assume" it will be later used for drawing. I would like to make the Event class oblivious to this if possible. Thanks!

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  • Java - Set Color by switch case function

    - by user369150
    I want to set the color of the TextView by the function getcolorss. I tried a lot of different ways but i cant get in it. Please help me i think the solution is easy. import java.awt.*; import android.graphics.Color; public class test extends Activity { TextView text1 = (TextView) findViewById(R.id.text1); text1.setTextColor(getcolorss(1)); public Color getcolorss(int x) { switch(x) { case 1: return Color.BLUE; case 2: return Color.RED; } } }

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