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  • Java Interfaces Methodology

    - by Amir Rachum
    Hi all, I've been programming in Java for a few courses in the University and I have the following question: Is it methodologically accepted that every class should implement an interface? Is it considered bad practice not to do so? Can you describe a situation where it's not a good idea to use interfaces? Thanks.

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  • Interrogating Java source code

    - by VibeofBoston
    I have a Java source code that I need to interrogate and apply security policies [for e.g. applying CWE] I have couple of ideas, for starters using AST and then travel thru the tree. Others include using regular expression. Are there any options other than AST or regex that I could use for such process.

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  • Converting String to int in Java and getting a NumberFormatException, can't figure out why

    - by user1687682
    ipString is a String representation of an IP address with spaces instead of dots. String[] ipArray = ipString.split(" "); String ip = ""; for (String part : ipArray){ if (part != null){ ip += part } } ip = ip.trim(); int ipInt = Integer.parseInt(ip); // Exception is thrown here. Exception in thread "main" java.lang.NumberFormatException: For input string: "6622015176". Could someone explain why this exception is being thrown?

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  • Escaping comma in java

    - by prasanna
    I have a string which is fed into the query as IN clause,which looks like this ('ACT','INACT') which is one of the parameters to a function inside a package.when a call is made to the function from java, it looks like this call package.function(1,2,3,('ACT','INACT'),4,5). When the package is called,i get error as wrong type of arguments. It is taking the values inside brackets as different values delimited by strings

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  • Implement eBay Finding/Feedback API [Java]

    - by zengr
    Hi, I have just started with the ebay Finding API and Feedback API and I need to deploy a basic API implementation on GAE/J. The problems are: How do we start with the local dev environment of the ebay SDK? There is no Java tutorial for the Finding API and feedback. GAE/J + ebay APIs won't cause any complexity right? I am looking for head start in the right direction,I am using Eclipse + GAE plugin.

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  • Java monospace draw string

    - by javaAmator
    Hello! How can I draw a String in Java (using Graphics2d) in monospace mode? I have a font that looks like LCD screen font, and I want to draw something like LCD label. I am using Digital 7 Mono font. Do you know where I can find another font that will be monospace and lcd (I wan to type only digitals)?

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  • Natural Language date and time parser for java

    - by Pranav
    Hey guys, I am working on a Natural Language parser which examines a sentence in english and extracts some information like name, date etc. for example: "Lets meet next tuesday at 5 PM at the beach." So the output will be something like : "Lets meet 15/09/2009 at 1700 hr at the beach" So basically, what i want to know is that is there any framework or library available for JAVA to do these kind of operations like parsing dates from a sentence and give a output with some specified format. Regards, Pranav

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  • How would someone implement mathematical formulae in java?

    - by Mohit Deshpande
    What I mean is like have to user input a string with multiple variables and get the value of those variable. Like a simple quadratic formula: x^2 + 5x + 10. Or in java: (Math.pow(x,2)) + (x * 5) + 10The user would then enter that and then the program would solve for x. I will be using the BeanShell Interpreter class to interpret the string as an equation. But how would I solve for x?

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  • Push alerts to notification tray app in Java

    - by Rich Anderson
    Hi - how do I push server alerts to tray apps in java without using xmpp or other heavy protocols? Do you recommend a way to accomplish this? I was planning to write an app which uses URLConnection on a server equipped with Comet but I doubt if that would work as the client requires a JS to be invoked and URLConnection is not a browser.. What is the best way to push instead of using a proprietary client-server approach?

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  • PDf library for Java

    - by yogsma
    Does anyone a good pdf library for Java ? My specific requirement is to find co-ordinates of the text in pdf file. If anyone knows, some pointers will be helpful.

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  • java jsp : connecting to sql server tutorial?

    - by phill
    Can anyone recommend a tutorial on how to write a java servlet which connects to ms sql server and manages data? I'm trying to write something which pulls products out of one database and inserts them into a stored procedure located on another database. thanks in advance

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  • Eclipse Doesn't List Classes Within Java Packages

    - by Matt Robertson
    Usually when I'm typing a Java import statement in Eclipse or otherwise referencing a class via the packages that it is in, Eclipse shows a context menu with a list of all classes within that package. There have been several times, however, that it would only shows subpackages within a package and would not show classes within that package. Does anyone know why this is? It sounds like a setting/preference was changed, but I never knowingly changed anything related to this.

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  • editing a string using BufferedReader in Java

    - by pbs
    Exception handling aside, I'm using the following to input a line of text in Java: BufferedReader strin = new BufferedReader(new InputStreamReader(System.in)); String txt = null; txt = strin.readLine(); However, I want to be able to edit an existing string, so that if txt were initialized to "hello" instead of null, then the readLine() would have the "hello" text in the buffer for me to edit. I can't see how to do this. Any help would be appreciated.

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  • Why doesn't Java warn about a == "something"?

    - by Marius
    This might sound stupid, but why doesn't the Java compiler warn about the expression in the following if statement: String a = "something"; if(a == "something"){ System.out.println("a is equal to something"); }else{ System.out.println("a is not equal to something"); } I realize why the expression is untrue, but AFAIK, a can never be equal to the String literal "something". The compiler should realize this and at least warn me that I'm an idiot who is coding way to late at night.

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  • Lightweight Java reporting engine

    - by tuler
    I'm looking for a lightweight java reporting engine to be embedded in an applet application. My first option was Jasper Reports, but the jar is over 2Mb, a little too heavy (and too bloated) for my needs. I don't know if there is modular jasper distribution, with funcionalities split in several jars (like html rendering, pdf, excel, compilation, runtime, etc). I need to preview the report using Swing and print it. PDF export is a plus.

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  • Background image in java

    - by Mona
    hi, i'm trying to put an image as a background of my interface in java , i tried to write a class that does that and using it , but is there a simpler way to do that . thanks

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