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  • Java "this" and inner class

    - by llm
    Is it possible to get a reference to this from within a Java inner class? i.e. Class outer { void aMethod() { NewClass newClass = new NewClass() { void bMethod() { // How to I get access to "this" (pointing to outer) from here? } }; } }

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  • Java: Interface vs Abstract Class (regarding fields)

    - by lifeR00t
    From what I have gathered, I want to force a class to use particular private fields (and methods) I need an abstract class because an interface only declares public/static/final fields and methods. Correct?? I just started my first big java project and want to make sure I'm not going to hurt myself later :)

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  • how to implement social drm in java?

    - by pcassiano
    how to implement social drm in java? how could i insert 'personal data' inside an e-book (.pdf or epub) automatically? i think in an software interface where consumer could insert his personal data and the system generates an e-book (locked) with these data... how could i implement this? tips?

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  • Class constructor in java

    - by aladine
    Please advise me the difference between two ways of declaration of java constructor public class A{ private static A instance = new A(); public static A getInstance() { return instance; } public static void main(String[] args) { A a= A.getInstance(); } } AND public class B{ public B(){}; public static void main(String[] args) { B b= new B(); } } Thanks

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  • Simple RSA encryption (Java)

    - by jake blue
    This is simply for fun. This will not be used for any actual encryption. I'm only first year comp sci student and love cryptography. This took a long time to get working. At approximately N = 18, it begins breaking down. It won't encrypt messages properly after that point. I'm not sure why. Any insights? I'd also appreciate any links you could provide me to tutorials or interesting reading about Cryptography. import java.math.BigInteger; import java.security.SecureRandom; /** * Cryptography. * * Generates public and private keys used in encryption and * decryption * */ public class RSA { private final static BigInteger one = new BigInteger("1"); private final static SecureRandom random = new SecureRandom(); // prime numbers private BigInteger p; private BigInteger q; // modulus private BigInteger n; // totient private BigInteger t; // public key private BigInteger e; // private key private BigInteger d; private String cipherText; /** * Constructor for objects of class RSA */ public RSA(int N) { p = BigInteger.probablePrime(N/2, random); q = BigInteger.probablePrime(N/2, random); // initialising modulus n = p.multiply(q); // initialising t by euclid's totient function (p-1)(q-1) t = (p.subtract(one)).multiply(q.subtract(one)); // initialising public key ~ 65537 is common public key e = new BigInteger("65537"); } public int generatePrivateKey() { d = e.modInverse(t); return d.intValue(); } public String encrypt(String plainText) { String encrypted = ""; int j = 0; for(int i = 0; i < plainText.length(); i++){ char m = plainText.charAt(i); BigInteger bi1 = BigInteger.valueOf(m); BigInteger bi2 = bi1.modPow(e, n); j = bi2.intValue(); m = (char) j; encrypted += m; } cipherText = encrypted; return encrypted; } public String decrypt() { String decrypted = ""; int j = 0; for(int i = 0; i < cipherText.length(); i++){ char c = cipherText.charAt(i); BigInteger bi1 = BigInteger.valueOf(c); BigInteger bi2 = bi1.modPow(d, n); j = bi2.intValue(); c = (char) j; decrypted += c; } return decrypted; } }

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  • Put Java Threading Class into a separate class

    - by erlord
    Consider following SWT code example: http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet151.java?view=co How can I separate the inline defined class? Thread thread = new Thread() { public void run() { ... } }; I want to define a separate class which updates the table just like it does here. How do I pass the list back to the table? Example code?

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  • Java ME right to left TextField label

    - by Nimrod Shory
    Hello, I'm writing a Java ME app and i need the label for the text field to be right aligned.. I've tried setting the layout of the TextField to Item.RIGHT but it doesn't seem to affect anything when running on my test phone (Nokia E71). The text inside the TextField is right aligned and Lists and such items are desplayed correctly (RTL aligned) but the TextField label isn't. Any ideas? Thanks.

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  • what are the Ways to create a gui to install a java app

    - by scot
    Hi, I have a java web application . Currently the application is installed in a cli mode [on windows/linux /solaris] by running sh or cmd scripts. I would like to create a GUI for the App installation so that user can edit info in gui for the installation. Any pointers/Best practices for developing gui would be helpful. thank you

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  • What does the ^ operator do in Java?

    - by joroj
    What function does the "^" operator serve in Java? When I try this: int a = 5^n; ...it gives me: for n = 5, returns 0 for n = 4, returns 1 for n = 6, returns 3 ...so I guess it doesn't indicate exponentiation. But what is it then?

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  • java on all platforms

    - by noname
    if you wanna code a desktop application in java for windows, mac and linux, will the code be the same for all of them? and you just change the GUI so that the Windows application will be more Windows-like and so on? how does it work without digging into details?

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  • Building vs. Compiling (Java)

    - by sixtyfootersdude
    Thinking that the answer to this is pretty obvious but here it goes: When I am working on a small project for school (in java) I "compile" it. On my coop we are using ant to "build" our project. I think that compiling is a subset of building. Is this correct? What is the difference between building and compiling?

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  • Excel In Java Web Application

    - by Anand
    Hi I have a java web application running on windows currently. I may host it in future in a Linux Server. My application allows people to upload data. I want to display the data they have uploaded in an excel file and render it in a portion of my webpage. How do I go about this ?

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  • K-Means Algorithm and java code

    - by Thandar
    Hi all, I need to calculate for grouping objects according to their size. I got k-means algorithms in java which calculate mostly for classifying according to their two or more features and the results are not satisfy for me.I only want to calculate for grouping objects based on one feature.Pseudocode or code would be helpful, too. Thanks u all for helping.

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  • Naming conventions for complex getters in Java

    - by Simon
    Hi there! I was reading this C# article about the usage of properties and methods. It points out why and when to use properties or methods. Properties are meant to be used like fields, meaning that properties should not be computationally complex or produce side effects I was asking myself how you could express this difference in Java, where you only use getters for the retrieval of data. What is your opinion?

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