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  • Interface naming in Java

    - by Allain Lalonde
    Most OO languages prefix their interface names with a capital I, why does Java not do this? What was the rationale for not following this convention? To demonstrate what I mean, if I wanted to have a User interface and a User implementation I'd have two choices in Java: Class = User, Interface = UserInterface Class = UserImpl, Interface = User Where in most languages: Class = User, Interface = IUser Now, you might argue that you could always pick a most descriptive name for the user implementation and the problem goes away, but Java's pushing a POJO approach to things and most IOC containers use DynamicProxies extensively. These two things together mean that you'll have lots of interfaces with a single POJO implementation. So, I guess my question boils down to: "Is it worth following the broader Interface naming convention especially in light of where Java Frameworks seem to be heading?"

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  • Java NIO Servlet to File

    - by Gandalf
    Is there a way (without buffering the whole Inputstream) to take the HttpServletRequest from a Java Servlet and write it out to a file using all NIO? Is it even worth trying? Will it be any faster reading from a normal java.io stream and writing to a java.nio Channel or do they both really need to be pure NIO to see a benefit? Thanks.

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  • Unit of measurement API in Java?

    - by Carlos P
    JSR-275 has been rejected, the Units of Measurement API for Java project is a set of interfaces, but haven't found an open source implementation. On this post: Which jsr-275 units implementation should be used? the project owner mentions the implementation was going to be ready by the end of last year on JScience, but didn't find anything there to convert between weight or length units and when I looked for JScience on https://maven.java.net/, I found it, but the JAR wasn't even in the directory https://maven.java.net/content/repositories/snapshots/org/jscience/jscience/5.0-SNAPSHOT/, so I had to get it from somewhere else. Has this project been left behind? And is there currently an implementation for conversion of Units of measurement in Java and even perhaps a Maven repo?

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  • Scala class to implement two Java Interfaces - how?

    - by puudeli
    Hi, I have just started learning Scala and I'm now wondering how I could implement two different Java interfaces with one Scala class? Let's say I have the following interfaces written in Java public interface EventRecorder { public void abstract record(Event event); } public interface TransactionCapable { public void abstract commit(); } But a Scala class can extend only one class at a time. How can I have a Scala class that could fulfill both contracts? Do I have to map those interfaces into traits? Note, my Scala classes would be used from Java as I am trying to inject new functionality written in Scala into an existing Java application. And the existing framework expects that both interface contracts are fulfilled.

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  • Sending multiple requests simultaneously to the Server using Selenium with Java

    - by gagneet
    I wish to send multiple requests to the server, simultaneously. The problem statement will be: Read a text file containing multiple URL’s. Open each URL in the web browser. Collect the Cookie information for each call, and store it to a file. Send another call: http://myserver.com:1111/cookie?out=text Store the output (body text) of this file to a separate file for each call made in 4 Open the next URL in the text file given in 1 and repeat steps 1-6. The above is to be run with multi-threading, so that I can send around 5-10 URL requests simultaneously. I have implemented something in Selenium using Java, but have not been able to do the multi-threading approach. Code is given below: package com.cookie.selenium; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import com.thoughtworks.selenium.*; public class ReadURL extends SeleneseTestCase { public void setUp() throws Exception { setUp("http://www.myserver.com/", "*chrome"); } public static void main(String args[]) { Selenium selenium = new DefaultSelenium("localhost", 4444, "*chrome", "http://myserver"); selenium.start(); selenium.setTimeout("30000000"); try { BufferedReader inputfile = new BufferedReader(new FileReader("C:\\url.txt")); BufferedReader cookietextfile = new BufferedReader(new FileReader("C:\\text.txt")); BufferedWriter cookiefile = new BufferedWriter(new FileWriter("C:\\cookie.txt")); BufferedWriter outputfile = null; String str; String cookiestr = "http://myserver.com:1111/cookie?out=text"; String filename = null; int i = 0; while ((str = inputfile.readLine()) != null) { selenium.createCookie("T=222redHyt345&f=5&r=fg&t=100",""); selenium.open( str ); selenium.waitForPageToLoad("120000"); String urlcookie = selenium.getCookie(); System.out.println( "URL :" + str ); System.out.println( "Cookie :" + urlcookie ); cookiefile.write( urlcookie ); cookiefile.newLine(); selenium.open( cookiestr ); selenium.waitForPageToLoad("120000"); String bodytext = selenium.getBodyText(); System.out.println("Body Text :" + bodytext); filename = "C:\\cookies\\" + i + ".txt"; outputfile = new BufferedWriter(new FileWriter( filename )); outputfile.write( bodytext ); outputfile.newLine(); i++; } inputfile.close(); outputfile.close(); cookiefile.close(); selenium.stop(); } catch (IOException e) { } } } What basically I am trying to do here is, open the first set of URL from a text file (which has list given of all the URL's i wish to open). Then when I capture the cookie information from here and store it, I open another window to output all the cookie information for that server to my browser window. This works fine when I do outside of Selenium code, but when I do it within the above code, it opens a "Save As..." popup and my tests stop. :-( I wish to save the contents of that second call to a new file, but have not been able to do the same. Also, if I have to send multiple such requests to the server, how would that be possible in Java using a Selenium Framework. Currently, I am opening multiple instances of the framework and running them with different parameters :-(

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  • Java swing app can't find image

    - by KáGé
    Hello, I'm making a torpedo game for school in java with swing gui, please see the zipped source HERE. I use custom button icons and mouse cursors of images stored in the /bin/resource/graphics/default folder's subfolders, where the root folder is the program's root folder (it will be the root in the final .jar as well I suppose) which apart from "bin" contains a "main" folder with all the classes. The relative path of the resources is stored in MapStruct.java's shipPath and mapPath variables. Now Battlefield.java's PutPanel class finds them all right and sets up its buttons' icons fine, but every other class fail to get their icons, e.g. Table.java's setCursor, which should set the mouse cursor for all its elements for the selected ship's image or Field.java's this.button.setIcon(icon); in the constructor, which should set the icon for the buttons of the "water". I watched with debug what happens, and the images stay null after loading, though the paths seem to be correct. I've also tried to write a test file in the image folder but the method returns a filenotfound exception. I've tried to get the path of the class to see if it runs from the supposed place and it seems it does, so I really can't find the problem now. Could anyone please help me? Thank you.

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  • Same keyword for two purposes in java? [closed]

    - by gurukulki
    Possible Duplicates: Same keyword for two purposes in java? Same keyword for two purposes in java? As we use "default" keyword as a access specifier, and it can be used in switch statements as well with complete different purpose, So i was curious that is there any other keywords in java which can be used in more then one purposes

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  • Silent Printing of PDF From Within Java

    - by Paul Reiners
    We are looking into silent printing of PDF documents from within Java. The printing will be invoked from the desktop and not through a browser so we cannot use JavaScript. PDF Renderer is an operational solution but their rendering quality is not acceptable. iText does not seem to be pluggable with the Java print service. There are some commercial Java libraries, jPDFPrint by Qoppa, JPedal, and ICEpdf which we have not tried out yet. Does anybody have any experience with PDF silent printing from Java?

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  • java - POST vs JDBC

    - by Dan
    OK so here's the code: import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; public class Main { public static void main(String[] args) { try { URL my_url = new URL("http://www.viralpatel.net/blogs/"); BufferedReader br = new BufferedReader(new InputStreamReader(my_url.openStream())); String strTemp = ""; while(null != (strTemp = br.readLine())){ System.out.println(strTemp); } } catch (Exception ex) { ex.printStackTrace(); } } } Using this method I can use POST and GET methods using PHP scripts. I can then use the PHP scripts to the MySQL database which in turn outputs back to the java applet. Is this possible? (and safer?) Thanks.

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  • Why is there no Constant keyword in Java?

    - by harigm
    I am curious learner of Java, and I was thinking about the topic of "CONSTANTS". I have learnt that Java allows us to declare constants by using final keyword. My question is why didn't Java introduce Constant (const) keyword. Since many people say it has come from C++, in C++ we have const keyword. Please share your thoughts.

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  • Why Constant Keyword is not introduced In Java?

    - by harigm
    I am curious learner of Java, I was thinking on one topic "CONSTANTS" I have learnt that Java allows us to declare constants by using "Final" keyword. My question is Java didnot introduce Constant(Const) Keyword. Since many people say it has come from C++, in C++ we have Const keyword Is there any strong reason behind, Please share your thoughts on this.

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  • Java application installer for linux

    - by rusiruboteju
    How can I create a linux installer for java desktop application? for an instance if we want to install netbeans on ubuntu there is a download which is named as "netbeans-6.8-ml-java-linux.sh" so how can i create "mydesktopapp-linux.sh" i have the properly working .jar file i want to distribute my java desktop app. Can anyone help me?

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  • java 6 web services share domain specific classes between server and client

    - by user173446
    Hi all, Context: Considering below defined Engine class being parameter of some webservice method. As we have both server and client in java we may have some benefits (???) in sharing Engine class between server and client ( i.e we may put in a common jar file to be added to both client and server classpath ) Some benefits would be : we keep specific operations like 'brushEngine' in same place build is faster as we do not need in our case to generate java code for client classes but to use them from the server build) if we later change server implementation for 'brushEngine' this is reflected automatically in client . Questions: How to share below detailed Engine class using java 6 tools ( i.e wsimport , wsgen etc )? Is there other tools for java that can achieve this sharing ? Is sharing a case that java 6 web services support is missing ? Can this case be reduced to other web service usage patterns? Thanks. Code: public class Engine { private String engineData; public String getData(){ return data; } public setData(String value){ this.data = value; } public void brushEngine(){ engineData = "BrushedEngine"+engineData; } }

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  • why do ppl hate java ?

    - by dfafa
    so today in my Java class.... someone bluntly stated today, it's piece of ** and the professor laughed too. some girl said she's slower in coding because of Java.... why such hatred for Java ?

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  • Calling Java from Python

    - by roddik
    Hello. I have a Java app that takes pretty much time to be initialized (so I can't use command-line like interface) and I need to pass text and receive the output of a Java method from Python. Is it possible to load the Java application, have it opened all the time the Python script runs and use a method from that app?

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  • What port is used by Java Web Start?

    - by kwc
    Hi, May I know what port is used by Java Web Start? If I want to connect a Java Web Start client to a Java Web Start server, what port I need to open at the server side so that the client can connect to it? I want to set up a firewall in the server machine but I don't know which port I should open. Thanks.

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  • Problem when get pageContent of URL in java ?

    - by tiendv
    Hi all ! i have a code for get pagecontent from a URL here is code ! import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; public class GetPageFromURLAction extends Thread { public String stringPageContent; public String targerURL; public String getPageContent(String targetURL) throws IOException { String returnString=""; URL urlString = new URL(targetURL); URLConnection openConnection = urlString.openConnection(); String temp; BufferedReader in = new BufferedReader(new InputStreamReader(openConnection.getInputStream())); while ((temp = in.readLine()) != null) { returnString += temp + "\n"; } in.close(); // String nohtml = sb.toString().replaceAll("\\<.*?>",""); return returnString; } public String getStringPageContent() { return stringPageContent; } public void setStringPageContent(String stringPageContent) { this.stringPageContent = stringPageContent; } public String getTargerURL() { return targerURL; } public void setTargerURL(String targerURL) { this.targerURL = targerURL; } @Override public void run() { try { this.stringPageContent=this.getPageContent(targerURL); } catch (IOException e) { e.printStackTrace(); } } } The problem is : 1 Some time i receive a error lik 405 ,or 403 HTTP error ... and result string is null . To repair i check permission to connect URL but it usualy return null URLConnection openConnection = urlString.openConnection(); openConnection.getPermission( ) is mean that i don't have permission to acess link ? To get resultString without HTML Tag ? i do like that String nohtml = sb.toString().replaceAll("\<.*?",""); Para sb is Stringbulder , but it can't remove all HTML Tab in string return ? I use thread here because i must get page alot of url , so how can i cread a multi thread to impro speed of program ! Thanks

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