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  • Ques: Which method will be called and y?

    - by Gaurav
    Ques: Which method will be called and y? public class Test { public void method(Object o){ System.out.println("object"); } public void method(String s) { System.out.println("String"); } public void method() { System.out.println("blank"); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Test test=new Test(); test.method(null); } }

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  • Acceptable name for extension method that accept null

    - by GaryX
    Hi, I really don't like to call String.IsNullOrEmpty(str). That makes me need to think "String" class first, then call it on the object "str". I like to call str.IsNullOrEmpty(), which doesn't need me to think "String" class. The problem is that extension method accept null instance to call on, which is not the usual case when you call a normal method. My question what do you think will be a convetion name for extension methods that accept null? For string, that is easy, "IsNullOrEmpty()" (anything that contains "IsNull") sounds good for me. For others, like GetDisplayName(), do we name it as "NullOrGetDisplayName" ?

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  • How to use the values from session variables in jsp pages that got saved using @Scope("session") in the mvc controllers

    - by droidsites
    Doing a web site using spring mvc. I added a SignupController to handle all the sign up related requests. Once user signup I am adding that to a session using @Scope("session"). Below is the SignupController code, SignupController.java @Controller @Scope("session") public class SignupController { @Autowired SignupServiceInter signUpService; private static final Logger logger = Logger.getLogger(SignupController.class); private String sessionUser; @RequestMapping("/SignupService") public ModelAndView signUp(@RequestParam("userid") String userId, @RequestParam("password") String password,@RequestParam("mailid") String emailId){ logger.debug(" userId:"+userId+"::Password::"+password+"::"); String signupResult; try { signUpService.registerUser(userId, password,emailId); sessionUser = userId; //adding the sign up user to the session return new ModelAndView("userHomePage","loginResult","Success"); //Navigate to user Home page if everything goes right } catch (UserExistsException e) { signupResult = e.toString(); return new ModelAndView("signUp","loginResult", signupResult); //Navigate to signUp page back if user does not exist } } } I am using "sessionUser" variable to store the signed up User Id. My understanding is that when I use @Scope("session") for the controller all the instance variables will added to HttpSession. So by that understanding I tried to access this "SessionUser" in userHomePage.jsp as, userHomepage.jsp Welcome to <%=session.getAttribute("sessionUser")%> But it throws null. So my question is how to use the values from session variables in jsp pages that got saved using @Scope("session") in the mvc controllers. Note: My work around is that pass that signed User Id to jsp page through ModelAndView, but it seems passing the value like these among the pages takes me back to managing state among pages using QueryStrings days.

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  • List with items returns empty

    - by Power-Mosfet
    I have created a simple List function but if I Loop through the List it's empty. It should not be! All, thank you for the input. problem solved // List function public class process_hook { public static List<string> pro_hook = list_all_processes(); protected static List<string> list_all_processes() { var list = new List<string>(); foreach (Process i in Process.GetProcesses(".")) { try { foreach (ProcessModule pm in i.Modules) { list.Add(pm.FileName); } } catch { } } return list; } } // call private void button1_Click(object sender, EventArgs e) { foreach (String _list in process_hook.pro_hook) { Console.WriteLine(_list); } }

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  • android webView loading finished but it was a blank only I touch the screen can the content show Idont know why?and how it happened

    - by Sunday
    when my webView load this page , it was blank-page or white page only I touch the screen the content can only show private WebView webview; private ProgressDialog mProgressDialog; private Context mContext; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_web); mContext = this; webview = (WebView)findViewById(R.id.myWebView); String url = (String)getIntent().getExtras().get("url"); webview.getSettings().setJavaScriptEnabled(true); webview.setWebViewClient(new MyWebViewClient()); if(url!=null){ webview.loadUrl(url); } } class MyWebViewClient extends WebViewClient { @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); mProgressDialog = ProgressDialog.show(mContext, "tips", "wate···the view is loading", true, false); } @Override public void onPageFinished(WebView view, String url) { mProgressDialog.dismiss(); super.onPageFinished(view, url); } }

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  • Compress small strings, With what to create external dictionary?

    - by Chris
    I want to compress much small strings (about 75-100 length c# string). At the time the dictionary is created I already know all short strings (nearly a trillion). There will no additional short strings in future. I need to extra exactly one string without decompress other strings. Now I am looking for a library or the best way to do the following: Create a dictionary using all strings I have Using this dictionary to compress each string a way to compress one string using the dictionary from 1. I found a good related question, but this is not c# specific. Maybe there is something for c# I do not know, or a fancy library or someone has already done that. That is the reason I ask this question.

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  • Generic delegate instances

    - by Luc C
    I wonder if C# (or the underlying .NET framework) supports some kind of "generic delegate instances": that is a delegate instance that still has an unresolved type parameter, to be resolved at the time the delegate is invoked (not at the time the delegate is created). I suspect this isn't possible, but I'm asking it anyway... Here is an example of what I'd like to do, with some "???" inserted in places where the C# syntax seems to be unavailable for what I want. (Obviously this code doesn't compile) class Foo { public T Factory<T>(string name) { // implementation omitted } } class Test { public void TestMethod() { Foo foo = new Foo(); ??? magic = foo.Factory; // No type argument given here yet to Factory! // What would the '???' be here (other than 'var' :) )? string aString = magic<string>("name 1"); // type provided on call int anInt = magic<int>("name 2"); // another type provided on another call // Note the underlying calls work perfectly fine, these work, but i'd like to expose // the generic method as a delegate. string aString2 = foo.Factory<string>("name 1"); int anInt2 = foo.Factory<int>("name 2"); } } Is there a way to actually do something like this in C#? If not, is that a limitation in the language, or is it in the .NET framework?

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  • What type of objects can be sent back to an action Method using HTML.HIDDEN()

    - by Richard77
    Hello, 1)Let's say I've this form: <%Using(Html.BeginForm()){%> <% = Html.Hidden("myObject", (cast to the appropriate type)ViewData["KeyForMyObject"]%> <input type = "submit" "Submit Object"> <%}%> 2) Here's the Action which's supposed to intercept the value of the object public ActionResult MyAction(Type myObject) { //Do Something with the object } Here's my question: What type of objects the Hidden field can support? In fact, when ViewData["KeyForMyObject"] contains a string, int, or bool, myAction is able to retrieve the value. But, when it comes to objects, such as List, and dictionary, nothing happens. When I debug to check the local values, I see null for Type myObject in the MyMethod. So what are the rules in MVC when it comes to a List or Dictionary? ================================= EDIT To make things simpler, can I write something like this <% = Html.Hidden("contactDic", (Dictionary<string, string>) ViewData["contacts"])%> and expect to retrieve the dictionary in the action Method like this public ActionResult myMethod(Dictionary<string, string> contactDic) { //Do something with the dictionary } Thanks for Helping

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  • How do I manipulate the format on a DataGridView that is bound to a Data Source?

    - by Jack Johnstone
    I´m using SQL Server 2005 and Visual Studio 2008, C#. In the data source (the SQL Server data table) I use the DateTime format mm/dd/yyyy, however, in a forms overview (DataGridView) users would like to see a completely other format, with year, week number and day number of week (yyww,d) which is in string format. I´ve created an algorithm for the transformation between values (date to weekday), but can I populate the affected cells with yyww,d (string) instead of mm/dd/yyyy (DateTime)? This is what I´ve been testing out, without success (and note, it´s on the last line the problem becomes obvious, as the cell value won´t accept a string on runtime - it still wants to be a DateTime...) private void DataGridViewQueryFindRequests_CellFormatting( object sender, DataGridViewCellFormattingEventArgs e) { string weekAndDay = ""; DataGridViewCell cell = DataGridViewQueryFindRequests.Rows[e.RowIndex].Cells[e.ColumnIndex]; if (cell.ColumnIndex == 13 && cell.Value == null) mEmptyRow = true; if ((cell.ColumnIndex == 14 || cell.ColumnIndex == 15) && !mEmptyRow) { weekAndDay = ClassWeeksAndDates.dateToWeekNumber(Convert.ToDateTime(cell.Value)); cell.ValueType = typeof(string); cell.Value = weekAndDay; } }

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  • How to quickly parse a list of strings

    - by math
    If I want to split a list of words separated by a delimiter character, I can use >>> 'abc,foo,bar'.split(',') ['abc', 'foo', 'bar'] But how to easily and quickly do the same thing if I also want to handle quoted-strings which can contain the delimiter character ? In: 'abc,"a string, with a comma","another, one"' Out: ['abc', 'a string, with a comma', 'another, one'] Related question: How can i parse a comma delimited string into a list (caveat)?

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  • What is/are the Scala way(s) to implement this Java "byte[] to Hex" class

    - by nicerobot
    I'm specifically interested in Scala (2.8) techniques for building strings with formats as well as interesting ways to make such a capability easily accessible where it's useful (lists of bytes, String, ...?).. public class Hex { public static String valueOf (final byte buf[]) { if (null == buf) { return null; } final StringBuilder sb = new StringBuilder(buf.length * 2); for (final byte b : buf) { sb.append(String.format("%02X", b & 0xff)); } return sb.toString(); } public static String valueOf (final Byteable o) { return valueOf(o.toByteArray()); } } This is only a learning exercise (so the utility and implementation of the Java isn't a concern.) Thanks

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  • Define a method in base class that returns the name of itself (using reflection) - subclasses inheri

    - by Khnle
    In C#, using reflection, is it possible to define method in the base class that returns its own name (in the form of a string) and have subclasses inherit this behavior in a polymorphic way? For example: public class Base { public string getClassName() { //using reflection, but I don't want to have to type the word "Base" here. //in other words, DO NOT WANT get { return typeof(Base).FullName; } return className; //which is the string "Base" } } public class Subclass : Base { //inherits getClassName(), do not want to override } Subclass subclass = new Subclass(); string className = subclass.getClassName(); //className should be assigned "Subclass"

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  • Java: over-typed structures? To have many types in Object[]?

    - by HH
    Term over-type structure = a data structure that accepts different types, can be primitive or user-defined. I think ruby supports many types in structures such as tables. I tried a table with types 'String', 'char' and 'File' in Java but errs. How can I have over-typed structure in Java? How to show types in declaration? What about in initilization? Suppose a structure: INDEX VAR FILETYPE //0 -> file FILE //1 -> lineMap SizeSequence //2 -> type char //3 -> binary boolean //4 -> name String //5 -> path String Code import java.io.*; import java.util.*; public class Object { public static void print(char a) { System.out.println(a); } public static void print(String s) { System.out.println(s); } public static void main(String[] args) { Object[] d = new Object[6]; d[0] = new File("."); d[2] = 'T'; d[4] = "."; print(d[2]); print(d[4]); } } Errors Object.java:18: incompatible types found : java.io.File required: Object d[0] = new File("."); ^ Object.java:19: incompatible types found : char required: Object d[2] = 'T'; ^

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  • Threading in java vs C#

    - by ffayyaz
    I need a little confirmation over something i am confused at . I know how threads work in java. new DialList(string a , string b).start(); // where DialList is a class public class DialList extends Thread { public DialList(String a, string b) { FilePath = a; ThreadLogFile = b"; } public void run() { // some code to run in different thread } } Now i want to run same code in C# , Shall i put the code which is in run() into a method and do something like Thread t = new Thread (runcsharp); // Kick off a new thread t.Start(); static void runcsharp() { // code } or is there some other way to do it ?

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  • c#: how to send ctrl+z

    - by I__
    how do i convert ctrl+z to a string? i am sending this as an AT COMMAND to an attached device to this computer basically i just to put some chars in a string and ctrl+z in that string as well

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  • DisplayObject not being displayed in AS3

    - by MarkSteve
    I have this class: public class IskwabolText extends Sprite { private var _tf:TextField; private var _tfmt:TextFormat; private var _size:Number; private var _text:String; public function IskwabolText(params:Object) { var defaultParams:Object = { color: 0x000000, background: false, backgroundColor: 0xFFFFFF, width: 0, height: 0, multiline: false, wordWrap: false }; // textfield _tf = new TextField(); _tf.antiAliasType = 'advanced'; _tf.embedFonts = true; _tf.type = 'dynamic'; _tf.selectable = false; // textformat _tfmt = new TextFormat(); set(defaultParams); set(params); } public function get(param:String):Object { switch (param) { case 'size': return _tfmt.size; case 'text': return _tf.text; case 'font': return _tfmt.font; case 'color': return _tfmt.color; case 'background': return _tf.background; case 'backgroundColor': return _tf.backgroundColor; case 'width': return _tf.width; case 'height': return _tf.height; case 'multiline': return _tf.multiline; case 'wordWrap': return _tf.multiline; default: return this[param]; } return null; } public function set(params:Object):Object { for (var i:String in params) { setParam(i, params[i]); } redraw(); return this; } private function setParam(param:String, value:Object):Object { switch (param) { case 'size': _tfmt.size = new String(value); break; case 'text': _tf.text = new String(value); break; case 'font': _tfmt.font = new String(value); break; case 'color': _tfmt.color = new uint(value); break; case 'background': _tf.background = new Boolean(value); break; case 'backgroundColor': _tf.backgroundColor = new uint(value); break; case 'width': _tf.width = new Number(value); break; case 'height': _tf.height = new Number(value); break; case 'multiline': _tf.multiline = new Boolean(value); break; case 'wordWrap': _tf.multiline = new Boolean(value); break; default: this[param] = value; break; } return this; } private function redraw():void { _tf.setTextFormat(_tfmt); if (contains(_tf)) removeChild(_tf); if (_tf.width == 0) _tf.width= _tf.textWidth+5; _tf.height = _tf.textHeight; addChild(_tf); } } But when I do this: public class Main extends Sprite { public function Main() { addChild(new IskwabolText({ size: 100, text: 'iskwabol', font: 'Default', // this is properly embedded color: 0x000000, x: stage.stageWidth / 2 - this.width / 2, y: 140 })); } } The child IskwabolText doesn't get displayed. What happening?

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  • C++ macro definition unclear

    - by Tony
    Is this a macro defintion for a class or what exactly is it? #define EXCEPTIONCLASS_IMPLEMENTATION(name, base, string) : public base \ { \ public: \ name() : base(string) {} \ name(const x::wrap_exc& next) : base(string,next) {}; \ name(const x::wrap_exc& prev, const x::wrap_exc& next) : \ base(prev, next) {}; \ }

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  • Unable to establish the connection to the file in BlackBerry

    - by Vikas
    I have tried the example code on SO to read the contents from the file in the resource directory in BlackBerry. But I am having an issue with the FileConnection. I get the following error: File system error (1003) I tried the example from here. I want only the read functionality, the file I want to read is in CSV format as a .txt file placed in the /res/test.txt. public class FileDemo extends MainScreen { public FileDemo() { setTitle("My Page"); String str = readTextFile("file:///test.txt"); System.out.println("Contents of the file::::::: " + str); } public String readTextFile(String fName) { String result = null; FileConnection fconn = null; DataInputStream is = null; try { fconn = (FileConnection) Connector.openInputStream(fName); is = fconn.openDataInputStream(); byte[] data = IOUtilities.streamToBytes(is); result = new String(data); } catch (IOException e) { System.out.println(e.getMessage()); } finally { try { if (null != is) is.close(); if (null != fconn) fconn.close(); } catch (IOException e) { System.out.println(e.getMessage()); } } return result; } } Any suggestions/advice on a better approach or as to how I can get this working??

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  • How to Pass complex objects in ASP.NET MVC using Get parameters?

    - by VJ
    I am wanting to pass something like the following to my view from my controller via GET not POST: public class MyDTO { public string val1 { get; set; } public string val2 { get; set; } public MyObject obj { get; set; } } public class MyObject { public int SomeInt { get; set; } public string ACoolValue { get; set; } public string YetAnotherCoolValue { get; set; } } And then the controller would like like this. (Note it is a GET): public ActionResult MyView(MyDTO dto) { return View(dto) } The problem is that the instance of MyObject is coming back as null, where val1 and val2 have data. Has anyone run across this?

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  • Preon library problem

    - by Kamahire
    I am using preon lib to parse binary data it contain short, int data The structure as follows @BoundNumber(size="32", byteOrder=ByteOrder.BigEndian) public int time;// @BoundString(size="2") public String alphaChar;// 2 byte array @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code1;//short @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code2;//short @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code3;//short @BoundString(size="8") public String firstName;// 8 byte array @BoundString(size="8") public String middleName;// 8 byte array @BoundString(size="8") public String lastName;// 8 byte array @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code4;//short I am getting correct values for code1, code2, code3 but for code4 it not giving me correct value. It always gives me 0(Zero); When I checked with position of byte array; it shows me correct value. Is there any kind padding require?

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  • VB.NET 2008 Application crashing during Do Loop

    - by RedHaze
    I am writing an application to compare each item on listbox1 to all items on listbox2. If the item is found, then remove it from both lists. The goal is to only have the items that were not found remain on both lists. The problem is, the application just hangs and I never get any results. I looked at my code several times and I cannot figure out what's going on (programming noob I know...). Can anybody help me with this? Code Snippet: Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim a As String Dim b As String Dim y As String For i As Integer = 0 To ListBox1.Items.Count - 1 a = ListBox1.Items(i) y = 1 Do While y = 1 For x As Integer = 0 To ListBox2.Items.Count - 1 b = ListBox2.Items(x) Dim res As Int16 = String.Compare(a, b) If res = 0 Then y = 0 ListBox2.Items.Remove(i) ListBox2.Items.Remove(x) ElseIf x = ListBox1.Items.Count Then Exit Do End If Next Loop Next End Sub

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