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• Determine if a number is a prime with regex?

  - by kitlite

  I found the following code example for Java on RosettaCode: public static boolean prime(int n) { return !new String(new char[n]).matches(".?|(..+?)\\1+"); } I don't know Java in particular but understand all aspects of this snippet except for the regex itself I have basic to basic-advanced knowledge of Regex as you find it in the built-in PHP functions How does .?|(..+?)\\1+ match prime numbers?

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• Is there a possability that method executes only once

  - by Gandalf StormCrow

  I have a for loop and structure like this : for(....) .... .... if(isTrue) ... do something.. .. method to be executed once (doTrick) is declared outside for loop. ....endif endfor public void doTrick() ... ... ..end Is it possible for a method in for loop to be executed only once? I'm using JAVA

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• Struct inside a class

  - by Balakrishnan

  I have a class definition of the form class X { public: //class functions private: A_type *A; //other class variables }; and struct A_type is defined as struct A_type { string s1,s2,s3; }; Inside the constructor, I allocate appropriate memory for A and try A[0].s1="somestring"; It shows segmentation fault. Is this kind of declaration invalid, or am I missing something

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• Exception Specyfication.

  - by Knowing me knowing you

  Does Exception specyfication is a part of method signature? What I mean is: public void someMethod(String myString) throws IOException is 'throws IOException' a part of a signature of this method? Thanks

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• question about interface

  - by davit-datuashvili

  i have posted this question http://stackoverflow.com/questions/2874487/how-can-i-implement-this-python-snippet-in-java i have compiled it now i need to use in main project public static void main(String[]args){ } ? can anybody show me example?

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• question about interface

  - by davit-datuashvili

  i have posted this question http://stackoverflow.com/questions/2874487/how-can-i-implement-this-python-snippet-in-java i have compiled it now i need to use in main project public static void main(String[]args){ } ? can anybody show me example?

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• question about interface

  - by davit-datuashvili

  i have posted this question http://stackoverflow.com/questions/2874487/how-can-i-implement-this-python-snippet-in-java i have compiled it now i need to use in main project public static void main(String[]args){ } ? can anybody show me example?

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• Java keep printing a new line in my recursive method

  - by Abra Grace Libretto White

  I am trying to write a recursive method to print n number of asteriks in a line and create a new line at the end. So, TriangleOps.line(5); would print ***** This is the code I wrote: public static void line (int n){ if(n>0){ System.out.println("*"); line(n-1); }} instead it prints * * * * * with a lot of space at the end. Can anyone tell me how to remove the line breaks?

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• Delegates with explicit "this" pointer?

  - by Qwertie

  Is it possible to adapt a method like this function "F" class C { public void F(int i); } to a delegate like Action<C,int>? I have this vague recollection that Microsoft was working on supporting this kind of adaptation. But maybe I misremembered!

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• Are there inline functions in java?

  - by giri

  There is any concept of inline function or its replaced by some other things in java..if yes then how we use it..because i'v heard that public, static and final methods are the inline function.can we create our own inline function?

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• Retrieving the value of a concatenated variable within a Java FOR loop

  - by Rajat

  I have been using this "logic" in C++ and VB with success, but am tied up in Java... Simply put, public void DataProviderExample(String user, String pwd, String no_of_links, String link1, String link2, String link3) { for (int i=1;i<=no_of_links;i++) { String link = "link"+i; System.out.println(link); } Now, if the variables link1, link2 and link3 have a value of "X", "Y" and "Z" respectively, upon running this program, I get the following output - link1 link2 link3 What I want is - X Y Z Any ideas?

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• Root base class in C++

  - by Littlesmith

  Every object in .NET inherits (directly or indirectly) from the common root base "Object". Is there such a common object root in C++? How do I pass any object to a function? public void DoSomeStuff(object o) { ... }

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• Image from WebView

  - by kostas_menu

  hi!i m getting a photo from the web,but i see it very large..how could i see it with zoom out?this is my code for webView: public class gavros extends Activity { WebView browser; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.efimerides); browser =(WebView)findViewById(R.id.webview); browser.loadUrl("http://resources.sport-fm.gr/sportfm/newspapers/10/12/24/gavros.jpg"); }}

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• How can I define a constructor in an open generic type?

  - by Cort

  I am trying to create on open generic type that has a constructor to be used by derived types, but I either don't know how to do it or it is not possible -- not sure which. public struct DataType<T> : IDataType { private T myValue; private TypeState myState; private DataType<T>(T initialValue, TypeState state) { myValue = initialValue; myState = state; } } Any help much appreciated! Cort

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• How to assign class instances in exception handler during constructor execution

  - by xwoundwortx

  public Alphabet(params char[] list) { this.ExceptionInitializer(); try { if (list != null) _alphabet = list; else throw this.NullableAssignment; //add exception handler; this._charCounter = list.Length; } catch (this.NullableAssignment) { // var x = new Alphabet(); // this = x; //FAIL! } }

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• Is that possible to have images, CSS and scripts in a Zend Framework module ?

  - by Matthieu

  In my Zend Framework modules, I have views that require specific scripts, CSS and images. Is that possible to include them in the module in a way that I don't have to copy them in each project that uses the module ? (because the "public/" folder is not part of the module, but specific to each application) If not, how can I do ? Thanks !

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• How do I stop the designer from filling in my properties with null values?

  - by Tim Gradwell

  When I add a control to a form, visual studio assigns various of the properties of that form a value of null in the auto-generated designer code. I don't want the designer to make the redundant assignment (the value is already null). Can anyone tell me how to prevent it? example MyControl has property public SomeClass MyProperty { get { return m_MyValue; } set { m_MyValue = value; } } designer then autogenerates the following: myControl1.MyProperty = null;

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• Is it standard C++ to set the value of a member pointer to the address of another member in the cons

  - by SilverSun

  Is this valid? class Foo { Bar m_bar; Bar * m_woo; public: Foo() : m_bar(42, 123), m_woo(&m_bar) { } };

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• using datatype in php is possible?

  - by fayer

  i have seen this in php (symfony): public function executeShow(sfWebRequest $request) { // logic } i didnt know that you could declare a datatype in php? have i missed something? could someone explain this. thanks

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• how to I get the class name when I am passing in a genertic in my method?

  - by Blankman

  My method looks like: public string DoObjectProperties<T>(T obj, string text) { } Now from within the method, I need to get the string value of the class name that i pass into the method's 'obj' parameter. So if I pass in the User object, I need the text 'user'. To get the properties I am using: typeof(T).GetProperties() How can I get the classes name?

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• Get the Description Attributes At Class Level

  - by Ngu Soon Hui

  I have such a class [Description("This is a wahala class")] public class Wahala { } Is there anyway to get the content of the Description attribute for the Wahala class?

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• how can we set the property of Viewstate?

  - by subodh

  I am using a enum public enum WatchUsageMode { Watch = 1, EmailPreferences = 2 } i want to set the property of that enum in my view state in such a way that whenever view state is null return Watch else EmailPreference.how can i set the property?

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• Does the Visual Studio debugger implicitly cast smaller types to int?

  - by emddudley

  Does the Visual Studio 2008 debugger implicitly cast all smaller data types to int? I have a function with the following signature: public int DoSomething(sbyte value) { ... } When pass in -127 and I look at the value argument the Visual Studio debugger (e.g. Watch window) shows me that it has the value 0xFFFFFF81. This is correct except for the fact that sbyte is only 8 bits wide; I would expect the debugger to show me that it is 0x81.

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• stl string return by const reference vs. const char*

  - by user342673

  i have a STL string member variable in my class, class A { public: const char* getData1() const { return data.c_str()); const string& getData2() const { return _data; } private: string _data; }; getData1() vs. getData2(), which one is better?

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• Is variables in the main methods are static.

  - by vaibhav

  Its a well known fact that static method can work only on static members. public static void Main() { Test t1 = new Test(); } Here Main method is static, but I hav'nt declared t1 as static. Is it implicitly static.

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