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• Circle class in java

  - by user292395

  I need to get the Java code for the below problem asap. Create a class Circle that will allow us to define a circle with a specific radius. Your class should include the following methods: A constructor that can create a circle with a specified radius. A method setRadius that sets a specific value as a new radius for an existing circle. A method getRadius that returns the radius of an existing circle. A method toString that returns a String with all the information about an existing circle. A method computeArea that computes the area of a circle A method computePerimeter that computes the perimeter of a circle.

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• AlarmManager Calling Function in Same Class

  - by jsc123

  I am trying to give a LocationClient a two-minute period to connect before calling getLastLocation on it. Initially I implemented this with a Timer (and TimerTask), but because Timers do not work in sleepmode, I would like to translate it to an AlarmManager. However, I am a bit confused as to how to do this, considering an AlarmManager calls another class, whereas I want to remain in the same class and simply delay for a two-minute period. This is how it looks with a Timer. Timer theTimer = new Timer(); theTimer.schedule(new TimerTask() { @Override public void run() { if(checkIfGooglePlay() && checkTime()) { getPostLocation(); stopSelf(); mLocationClient.disconnect(); } } }, TWO_MINUTES);

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• "Automatic" class proxy in C++

  - by PierreBdR

  I need to allow the user to change members of two data structures of the same type at the same time. For example: struct Foo { int a, b; } Foo a1 = {1,2}, a2 = {3,4}; dual(a1,a2)->a = 5; // Now a1 = {5,2} and a2 = {5,2} I have a class that works and that change first a1 and then copy a1 into a2. This is fine as long as: the class copied is small the user doesn't mind about everything being copied, not only the part modified. Is there a way to obtain this behavior: dual(a1,a2)->a = 5; // Now a1 = {5,2} and a2 = {5,4} I am opened to alternative syntax, but they should stay simple, and I would like to avoid things like: set_members(a1, a2, &Foo::a, 5); members(a1, a2, &Foo::a) = 5; or anything involving specifying explictely &Foo::

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• How to inherit from the main class in java

  - by user225269

  I have two java classes. One is NewFrame.java where the forms(buttons, textfields) are located. And the other one is Main.java where I have put the connection string for mysql: Main.java looks like this: public class Main { /** * @param args the command line arguments */ public static void main(String[] args) throws Exception { // TODO code application logic here Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/employee_record", "root", "password"); PreparedStatement statement = con.prepareStatement("select * from employee"); ResultSet result = statement.executeQuery(); } } How do I inherit from the main.java so that the declarations in it would be universally accessible to the forms in NewFrame.java? Please help. Thanks

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• calling normal java class from servlet

  - by Mohammed_Q

  Hello Every time im trying to access a normal java class from servlet (from other project) it gives me classNotFound exception, any idea how to fix this problem thanks in advance

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• Java: global values inside a class?

  - by HH

  I want less methods. I want a common global TestClass from which I could use any of its value inside the class. import java.util.*; import java.io.*; public class TestClass { TestClass(String hello){ String hallo = hello; String halloSecond = "Saluto!"; } public static void main(String[] args) { TestClass test = new TestClass("Tjena!"); System.out.println("I want "Tjena!": " + test.hallo); TestClass testSecond = new TestClass("1"); System.out.println("I want Saluto!:" + test.halloSecond); System.out.println("I want Saluto!:" + testSecond.halloSecond); } }

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• How to use a class as the base, but hide the class type publically?

  - by James

  I am currently just exposing the properties through a generic interface e.g. public interface IBaseClass { int ID { get; set; } } internal class MyBaseClass : IBaseClass { public MyBaseClass() { } public int ID { get; set; } } public class MyExposedClass : IBaseClass { private MyBaseClass _base = new MyBaseClass(); public int ID { get { return _base.ID; } set { _base.ID = value; } } } Then in my main application I can do: IBaseClass c = new MyExposedClass(); c.ID = 12345; But can't do: MyBaseClass b = new MyBaseClass(); This is my desired behaviour. However, I was just wondering if this is the correct approach? Or if there was a better way?

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• How to map a search object to a class with more fields with JPA annotations

  - by Moli

  Hi all, I'm a newbie with JPA. I need to map a search object to a table. The search object has only and id, name. The big object has more fileds id, name, adress and more. I use this as big object view plaincopy to clipboardprint? I use this as big object @Entity @Table(name="users") public class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; private String adress; private String keywords; } //this is my search object @XXX public class UserSearch { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; } What annotations I need to use to map the search object to the table users? I'm using spring+struts2+hibernate+JPA. Help is appreciated! Thanks!

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• c++ when to put method out side the class

  - by user63898

  i saw that some times in c++ applications using only namespace declarations with header and source file like this : #ifndef _UT_ #define _UT_ #include <string> #include <windows.h> namespace UT { void setRootPath(char* program_path, char* file_path); char * ConvertStringToCharP(std::string str); }; #endif //and then in UT.cpp #include "UT.h" namespace UT { char * ConvertStringToCharP(std::string str) { char * writable = new char[str.size() + 1]; std::copy(str.begin(), str.end(), writable); writable[str.size()] = '\0'; return writable; } void setRootPath(char* program_path, char* file_path) { //... } } is it better then defining classic class with static methods? or just simple class ? dose this method has something better for the compiler linker ? the methods in this namespace are called allot of times .

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• WPF Creating an instance of a class in xaml

  - by Cloverness

  Hi, I have a problem with creating the instance of a class in xaml file. I thought you can do it like this: in the resource part of the user control and then use it in the xaml file (for example bind to it). But even tough the class I created is located in the same namespace it says that: "The type was not found. Verfiy that all assemblies were built, etc". How to get it right? is there another method? Thanks for suggestions.

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• How to get OMElement by name in mediate?

  - by luohao

  I have a response message like this: <message> <header> <TransactionID>1</TransactionID> <Timestamp>2012-05-22 10:10:36</Timestamp> <OpCode>BOSS_DELETE_USER_SME.CD</OpCode> <MsgType>RESP</MsgType> <ReturnCode>1016</ReturnCode> <ErrorMessage>uif return error message!</ErrorMessage> </header> </message> I need convert RetuenCode "1016" to "0" in extension class. How to get OMElement "ReturnCode" in mediate? My code is failed. SOAPEnvelope envelope = context.getEnvelope(); SOAPBody soapBody = envelope.getBody(); QName ReturnCode = new QName(null, "ReturnCode"); OMElement response = soapBody.getFirstChildWithName(ReturnCode);

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• i try to combine GUI with class - no success

  - by Gold

  hi i made a class that make registration to my WinCE program. how i can from the class draw pannel + textbox, and catch the enter press from the textbox ? i try to do this: TextBox tb=new TextBox(); tb.Location=new Point(10,10); Panel pn=new Panel(); pn.Dock=DockStyle.Fill; pn.Controls.Add(tb); this.Controls.Add(pn); but i got error in: this.Controls.Add(pn); is there any simple sample code for this ? thank's in advance

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• Ruby Koans 202: Why does the correct answer give a syntax error?

  - by hlh

  I'm working through the about_classes.rb file in the Ruby Koans, and have hit a brick wall with the "inside_a_method_self_refers_to_the_containing_object" test. Here's the code: class Dog7 attr_reader :name def initialize(initial_name) @name = initial_name end def get_self self end def to_s __ end def inspect "<Dog named '#{name}'>" end end def test_inside_a_method_self_refers_to_the_containing_object fido = Dog7.new("Fido") fidos_self = fido.get_self assert_equal <Dog named 'Fido'>, fidos_self end So, I'm trying to make the first half of the assert_equal evaluate to the second half (fidos_self). When I work it out in irb, fidos_self returns <Dog named 'Fido'>, but I keep receiving a syntax error for that answer. I've seen this similar post: Ruby Koans: Where are the quotes in this return value?, but his solution (putting fido instead of <Dog named 'Fido'>) causes my rake to abort, saying the stack level is too deep. This is driving me nuts. What am I missing here?

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• Application.Current changes when using reflection to create an instance of another Application class

  - by markti

  Let's say I have the following Silverlight Applications: App1.xap App2.xap App3.xap Let's say that I start App1.xap as the default xap file. If I load App2.xap and App3.xap and instantiate an Application class within one of the other two XAPs. The Application.Current changes to be that new instance. System.Windows.Application obj = Activator.CreateInstance(type) as System.Windows.Application; I don't want the current application to change. I just want to get the merged Resource Dictionaries off the Application class.

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• Int property in class definition

  - by Daniel I-S

  I have the following class structure for custom UITableViewCells: NumericEntryCell - Contains method for controlling max value that can be entered into a textbox. SliderCell - inherits from NEC and contains methods for handling slider-control of textbox value TextOnlyCell - just contains a textbox CellA - inherits from SliderCell and has a max value of 28 CellB - inherits from TextOnlyCell and has a max value of 150. I want NumericEntryCell to contain a definition for a property that contains the maxValue. I want to be able to set a value for this in the initialize method of a child class (CellA or CellB). Currently I have an int maxValue declared in the interface of NEC. I declare a property for this with @property int maxValue and @synthesize it within the .m file. However, attempting to modify this property's value from CellA or CellB's initialize method has no effect - when I hit a breakpoint in the NEC method that uses this value, its value is always zero. How can I get this to work?

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• DRY'er Object Initialization in Ruby

  - by Trevoro

  Hi, Is there a more 'DRY' way to do the following in ruby? #!/usr/bin/env ruby class Volume attr_accessor :name, :size, :type, :owner, :date_created, :date_modified, :iscsi_target, :iscsi_portal SYSTEM = 0 DATA = 1 def initialize(args={:type => SYSTEM}) @name = args[:name] @size = args[:size] @type = args[:type] @owner = args[:owner] @iscsi_target = args[:iscsi_target] @iscsi_portal = args[:iscsi_portal] end def inspect return {:name => @name, :size => @size, :type => @type, :owner => @owner, :date_created => @date_created, :date_modified => @date_modified, :iscsi_target => @iscsi_target, :iscsi_portal => @iscsi_portal } end def to_json self.inspect.to_json end end

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• C++ performance when accessing class members

  - by Dr. Acula

  I'm writing something performance-critical and wanted to know if it could make a difference if I use: int test( int a, int b, int c ) { // Do millions of calculations with a, b, c } or class myStorage { public: int a, b, c; }; int test( myStorage values ) { // Do millions of calculations with values.a, values.b, values.c } Does this basically result in similar code? Is there an extra overhead of accessing the class members? I'm sure that this is clear to an expert in C++ so I won't try and write an unrealistic benchmark for it right now

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• How to order my objects in a C++ class correctly

  - by Julen

  Hello, I have been coding regurlarly in C++ in the past months. I am getting used to it step by step... but there are things that confuse me about formatting. I know there is a lot of legacy from C that I supousee mixes with C++. This time I have doubts about how to order properly my members and functions within in a class. Also considering their access modifiers. How is the convention in this? Until know I am doing everything "public" and writing first constructor of class, then destructor, next members and finally functions. It this correct? What happens when introducing "private" and "protected" access modifiers or "virtual" functions? From the documents I have look in the Internet there is different ways of doing things. But my questions aims to get the knowledge from a community that develops in C++ that I want to blend into. ;-) Thanks a lot!!!

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• Size of a class with 'this' pointer

  - by psvaibhav

  The size of a class with no data members is returned as 1 byte, even though there is an implicit 'this' pointer declared. Shouldn't the size returned be 4 bytes(on a 32 bit machine)? I came across articles which indicated that 'this' pointer is not counted for calculating the size of the object. But I am unable to understand the reason for this. Also, if any member function is declared virtual, the size of the class is now returned as 4 bytes. This means that the vptr is counted for calculating the size of the object. Why is the vptr considered and 'this' pointer ignored for calculating the size of object?

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• Class views in Django

  - by Sebastjan Trepca

  Django view points to a function, which can be a problem if you want to change only a bit of functionality. Yes, I could have million keyword arguments and even more if statements in the function, but I was thinking more of an object oriented approach. For example, I have a page that displays a user. This page is very similar to page that displays a group, but it's still not so similar to just use another data model. Group also has members etc... One way would be to point views to class methods and then extend that class. Has anyone tried this approach or has any other idea?

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• Performance when accessing class members

  - by Dr. Acula

  I'm writing something performance-critical and wanted to know if it could make a difference if I use: int test( int a, int b, int c ) { // Do millions of calculations with a, b, c } or class myStorage { public: int a, b, c; }; int test( myStorage values ) { // Do millions of calculations with values.a, values.b, values.c } Does this basically result in similar code? Is there an extra overhead of accessing the class members? I'm sure that this is clear to an expert in C++ so I won't try and write an unrealistic benchmark for it right now

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• Using ExecuteQuery() with entity framework, entity class.

  - by sfreelander

  I am trying to jump from ASP Classic to asp.net. I have followed tutorials to get Entity Framework and LINQ to connect to my test database, but I am having difficulties figuring out ExecuteQuery(). I believe the problem is that I need an "entity class" for my database, but I can't figure out how to do it. Here is my simple code: Dim db as New TestModel.TestEntity Dim results AS IEnumerable(OF ???) = db.ExecuteQuery(Of ???)("Select * from Table1") From the microsoft example site, they use an entity class called Customers, but I don't understand what that means.

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• Call function from object instantiated in one class in another

  - by Dk43

  I have two classes, both of which need to be able to call the same instance of entitymanager class Engine { EntityManager::Entitymanager EManager; } And I need to add an object to a vector contained by this particular instance of Engine. What I want to do is be able to add a bullet spawned by the player to the vector that contains all my entities. class Player : Entity { void SpawnBullet() {Engine::EManager.Add(BULLET);} } The above returns this error: error: object missing in reference to ‘Engine::EManager’ How do I resolve this? Any help or pointers in the right direction would be much appreciated!

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• Push a detail view in UITableViewCell class

  - by luca

  My class inherit from UITableViewCell, i have make some custom transitions to push a new detail view when an image get selected. [UIView transitionWithView:self.masterView duration:0.5 options:UIViewAnimationOptionShowHideTransitionViews animations:^ { [self.masterView addSubview:self.detailImage]; } completion:nil]; My code works fine, the detailImage subview is shown with a transition, but this transition is not what i want exactly. What i want to perform is a simple transition from bottom to up. The list of UIViewAnimation doesn't contain such animation. Is there any way to use that transition without changing my class inheritance to UINavigationController ?

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• Access WindowedApplication from package class.

  - by Senling

  Hi, I'm developing an AIR application, where i need to access WindowedApplication's function from the package class. This is the Main application (Partial code) import mx.events.CloseEvent; import messages.MessageWindow public function undock():void { stage.nativeWindow.visible = true; stage.nativeWindow.orderToFront(); //Clearing the bitmaps array also clears the applcation icon from the systray NativeApplication.nativeApplication .icon.bitmaps = []; } ]] Package: (Partial code) package messages { public class MessageWindow extends NativeWindow { public function MessageWindow():void { stage.addEventListener(MouseEvent.MOUSE_DOWN,onClick); } private function onClick(event:MouseEvent):void { ****** Need to call the undock method from here. ***** } } } Is it possible to call this way or suggest any other solution Thanks in advance Senling.

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