For your reference:

 - [Sharpen][1] by [db4o][2]
 - [XES][3]
 - [RemoteSoft Octopus][4] (commercial)

Note: I had no experience on them.


  [1]: http://developer.db4o.com/Projects/html/projectspaces/db4o_product_design/sharpen.html
  [2]: http://db4o.com/
  [3]: http://www.euclideanspace.com/software/language/xes/userGuide/convert/javaToCSharp/index.htm &quot;XES - User Guide - Converting Java Source code to C#&quot;
  [4]: http://www.remotesoft.com/octopus/

Don&#39;t. Leave them as Java and use IKVM to convert them to .Net DLLs.

* http://www.ikvm.net/devguide/java2net.html
* http://sourceforge.net/apps/mediawiki/ikvm/index.php?title=Ikvmc


I&#39;ve had good results with this one.  Much easier to use than Sharpen.  

http://tangiblesoftwaresolutions.com/Product_Details/Java_to_CSharp_Converter.html

Microsoft has a tool called JLCA: [Java Language Conversion Assistant][1]. I can&#39;t tell if it is better though, as I have never compared the two.


  [1]: http://www.microsoft.com/downloads/details.aspx?FamilyID=46bea47e-d47f-4349-9b4f-904b0a973174&amp;displaylang=en

    Foo = Class.new
    Foo.class_eval do
      def class_bar
        &quot;class_bar&quot;
      end
    end
    Foo.instance_eval do
      def instance_bar
        &quot;instance_bar&quot;
      end
    end
    Foo.class_bar       #=&gt; undefined method ‘class_bar’ for Foo:Class
    Foo.new.class_bar   #=&gt; &quot;class_bar&quot;
    Foo.instance_bar       #=&gt; &quot;instance_bar&quot;
    Foo.new.instance_bar   #=&gt; undefined method ‘instance_bar’ for #&lt;Foo:0x7dce8&gt;

Just based on the name of the methods, **I would expect class_eval to allow you to add a class method to Foo and instance_eval to allow you to add an instance method to Foo. But they seem to do the opposite**.

In the example above if you call class_bar on the Foo class you get an undefined method error and if you call instance_bar on the instance returned by Foo.new you also get an undefined method error. Both errors seem to contradict an intuitive understanding of what class_eval and instance_eval should do. 

**What is really the difference between these methods?**

Documentation for [class_eval][1]:

&gt; mod.class_eval(string [, filename [,
&gt; lineno]]) =&gt; obj
&gt; 
&gt; *Evaluates the string or block in the
&gt; context of mod. This can be used to
&gt; add methods to a class.*

Documentation for [instance_eval][2]:

&gt; obj.instance_eval {| | block } =&gt; obj
&gt; 
&gt; *Evaluates a string containing Ruby
&gt; source code, or the given block,
&gt; within the context of the receiver
&gt; (obj). In order to set the context,
&gt; the variable self is set to obj while
&gt; the code is executing, giving the code
&gt; access to obj’s instance variables.*


  [1]: http://www.ruby-doc.org/core-1.8.6/classes/Module.html#M001673
  [2]: http://www.rubybrain.com/api/ruby-1.8.7/doc/index.html?a=M000295&amp;name=instance_eval

How to understand the difference between class_eval() and instance_eval()?

Given a python file with the following repeated endlessly:

    def myFunction(a, b, c):
        if a:
            print b
        elif c:
            print &#39;hello&#39;

I&#39;d like to move around and edit this file using familiar vim movements.  For instance, using (, ), [[, ]], {, } or deleting/yanking/changing text using commands like di}.

In other languages (like C++, Java, C#, etc) you&#39;ve got curly brackets abound, so using a movement like di} can easily find a matching curly brace and act on that block. And in fact if I am on the &#39;b&#39; character on the above text and do a di) in vim, it successfully deletes the text between the two parens.

The issue is in python&#39;s detection of code blocks, I think.  Using (, ), [[, ]], {, or } as movements all pretty much do the same thing, bringing you to the start (above or on the def line) or end (after the last line of the function) of the function.  And there is no way, as far as I know, to easily tell vim &quot;select everything for this indentation block.&quot;  In the above example, I&#39;d like to be on in &#39;i&#39; of the if line, type di} and have it delete the entire if block (to the end of this particular function).

I&#39;m sure it should be possible to tell vim to operate on an indentation basis for such movements (well, maybe not that particular movement, but some user defined action).  Any thoughts on how to accomplish this?

More efficient movements editing python files in vim

What is the best tool out there at the moment to convert java to c#? Apart from

- j2ctranslator
- j#

I use IKVM at the moment.

Tool to convert java to c# code

<p>What is the best tool out there at the moment to convert java to c#? Apart from</p>
<ul>
<li>j2ctranslator</li>
<li>j#</li>
</ul>
<p>I use IKVM at the moment.</p>


Given the following example (using JUnit with Hamcrest matchers):

    Map&lt;String, Class&lt;? extends Serializable&gt;&gt; expected = null;
    Map&lt;String, Class&lt;java.util.Date&gt;&gt; result = null;
    assertThat(result, is(expected));  

This does not compile with the JUnit `assertThat` method signature of:

	public static &lt;T&gt; void assertThat(T actual, Matcher&lt;T&gt; matcher)

The compiler error message is:

    Error:Error:line (102)cannot find symbol method
    assertThat(java.util.Map&lt;java.lang.String,java.lang.Class&lt;java.util.Date&gt;&gt;,
    org.hamcrest.Matcher&lt;java.util.Map&lt;java.lang.String,java.lang.Class
        &lt;? extends java.io.Serializable&gt;&gt;&gt;)

However, if I change the `assertThat` method signature to:

    public static &lt;T&gt; void assertThat(T result, Matcher&lt;? extends T&gt; matcher)

Then the compilation works.

So three questions:

1. Why exactly doesn&#39;t the current version compile? Although I vaguely understand the covariance issues here, I certainly couldn&#39;t explain it if I had to.
2. Is there any downside in changing the `assertThat` method to `Matcher&lt;? extends T&gt;`? Are there other cases that would break if you did that?
3. Is there any point to the genericizing of the `assertThat` method in JUnit? The `Matcher` class doesn&#39;t seem to require it, since JUnit calls the matches method, which is not typed with any generic, and just looks like an attempt to force a type safety which doesn&#39;t do anything, as the `Matcher` will just not in fact match, and the test will fail regardless. No unsafe operations involved (or so it seems).

For reference, here is the JUnit implementation of `assertThat`:

	public static &lt;T&gt; void assertThat(T actual, Matcher&lt;T&gt; matcher) {
	    assertThat(&quot;&quot;, actual, matcher);
	}

	public static &lt;T&gt; void assertThat(String reason, T actual, Matcher&lt;T&gt; matcher) {
		if (!matcher.matches(actual)) {
			Description description = new StringDescription();
			description.appendText(reason);
			description.appendText(&quot;\nExpected: &quot;);
            matcher.describeTo(description);
			description
                .appendText(&quot;\n     got: &quot;)
                .appendValue(actual)
				.appendText(&quot;\n&quot;);

			throw new java.lang.AssertionError(description.toString());
		}
	}

When do Java generics require &lt;? extends T&gt; instead of &lt;T&gt; and is there any downside of switching?

Since Java doesn&#39;t allow passing methods as parameters, what trick do you use to implement Python like list comprehension in Java ?

I have a list (ArrayList) of Strings. I need to transform each element by using a function so that I get another list. I have several functions which take a String as input and return another String as output. How do I make a generic method which can be given the list and the function as parameters so that I can get a list back with each element processed. It is not possible in the literal sense, but what trick should I use ?

The other option is to write a new function for each smaller String-processing function which simply loops over the entire list, which is kinda not so cool.

Python-like list comprehension in Java

Sometimes when I see my logging code I wonder if I am doing it right. There might be no definitive answer to that, but I have the following concerns:

**Library Classes**

I have several library classes which might log some `INFO` messages. Fatal Errors are reported as exceptions. Currently I have a static logger instance in my classes with the class name as the logging name. (Log4j&#39;s: `Logger.getLogger(MyClass.class)`)

Is this the right way? Maybe the user of this library class doesn&#39;t want any messages from my implementation or wants to redirect them to an application specific log. Should I allow the user to set a logger from the &quot;outside world&quot;? How do you handle such cases?

**General logs**

In some applications my classes might want to write a log message to a specific log not identified by the class&#39; name. (I.e.: `HTTP Request log`) What is the best way to do such a thing? A lookup service comes to mind...



Logging in Java and in general: Best Practices?

I have this in an ActiveMQ config:

&lt;!-- language: lang-xml --&gt;

    &lt;sslContext&gt;
            &lt;sslContext keyStore=&quot;file:/home/alex/work/amq/broker.ks&quot;  
     keyStorePassword=&quot;password&quot; trustStore=&quot;file:${activemq.base}/conf/broker.ts&quot; 
     trustStorePassword=&quot;password&quot;/&gt;
    &lt;/sslContext&gt;


I have a pair of X.509 cert and a key file.

How do I import those two in order to use them in SSL and SSL+stomp connectors? All examples I could google always generate the key themselves, but I already have a key.

I have tried

    keytool -import  -keystore ./broker.ks -file mycert.crt

but this only imports the certificate and not the key file and results in

    2009-05-25 13:16:24,270 [localhost:61612] ERROR TransportConnector - Could not accept connection : No available certificate or key corresponds to the SSL cipher suites which are enabled.

I have tried concatenating the cert and the key but got the same result.

How do I import the key?


How to import an existing X.509 certificate and private key in Java keystore to use in SSL?

How do you get Hours and Minutes since `Date.getHours` and `Date.getMinutes` got deprecated? The examples that I found on Google search used the deprecated methods.

Java: getMinutes and getHours

Is there an easy way to check in a unit test that two arrays are equal (that is, have the same number of elements, and each element is the same?).

In Java, I would use `assertArrayEquals (foo, bar);`, but there seems to be no equivalent for C#. I tried `Assert.AreEqual(new string[]{&quot;a&quot;, &quot;b&quot;}, MyFunc(&quot;ab&quot;));`, but even though the function returns an array with &quot;a&quot;, &quot;b&quot; the check still fails

This is using Visual Studio 2008 Team Suite, with the built-in unit test framework.

Assert that arrays are equal in Visual Studio 2008 test framework

I&#39;m trying to write a web service client in c# which the webservice is Java Axis 1.4.
Axis service requires the **Authorization: Basic Base64EncodedToken** header value in the HTTP Headers. 
I can&#39;t find a way to set this header in standart ways of consuming web services in visual studio.net, like normal WSDL generated refernce nor with WSE3.0

I can&#39;t use WCF as the project is developed using .net 2.0.

Is there any way to do this ?


How to add custom Http Header for C# Web Service Client consuming Axis 1.4 Web service

I have a textbox with the .Multiline property set to true.  At regular intervals, I am adding new lines of text to it.  I would like the textbox to automatically scroll to the bottom-most entry (the newest one) whenever a new line is added.  How do I accomplish this?

How do I automatically scroll to the bottom of a multiline text box?

C# 2008

I have been working on this for a while now, and I am still confused about the use of finalize and dispose methods in code. My questions are below:

 1. I know that we only need a finalizer while disposing unmanaged resources. However, if there are managed resources that make calls to unmanaged resources, would it still need to implement a finalizer?

 2. However, if I develop a class that doesn&#39;t use any unmanaged resource -  directly or indirectly, should I implement the `IDisposable` to allow the clients of that class to use the &#39;using statement&#39;? 

    Would it be feasible to implement IDisposable just to enable clients of your class to use the using statement?

        using(myClass objClass = new myClass())
        {
            // Do stuff here
        }

 3. I have developed this simple code below to demonstrate the Finalize/dispose use:


        public class NoGateway : IDisposable
        {
            private WebClient wc = null;
       
            public NoGateway()
            {
                wc = new WebClient();
                wc.DownloadStringCompleted += wc_DownloadStringCompleted;
            }
      
      
            // Start the Async call to find if NoGateway is true or false
            public void NoGatewayStatus()
            {
                // Start the Async&#39;s download
                    // Do other work here
                wc.DownloadStringAsync(new Uri(www.xxxx.xxx));
            }
      
            private void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
            {
                // Do work here
            }
      
            // Dispose of the NoGateway object
            public void Dispose()
            {
                wc.DownloadStringCompleted -= wc_DownloadStringCompleted;
                wc.Dispose();
                GC.SuppressFinalize(this);
            }
        }

Question about the source code:

 1. Here I have not added the finalizer, and normally the finalizer will be called by the GC, and the finalizer will call the Dispose. As I don&#39;t have the finalizer, when do I call the Dispose method? Is it the client of the class that has to call it?

    So my class in the example is called NoGateway and the client could use and dispose of the class like this:  
    

        using(NoGateway objNoGateway = new NoGateway())
        {
            // Do stuff here   
        }

    Would the Dispose method be automatically called when execution reaches the end of the using block, or does the client have to manually call the dispose method? i.e.

        NoGateway objNoGateway = new NoGateway();
        // Do stuff with object
        objNoGateway.Dispose(); // finished with it


 2. I am using the `WebClient` class in my `NoGateway` class. Because `WebClient` implements the `IDisposable` interface, does this mean that `WebClient` indirectly uses unmanaged resources? Is there a hard and fast rule to follow this? How do I know that a class uses unmanaged resources?

Use of Finalize/Dispose method in C#

If I have some text in a String, how can I copy that to the clipboard so that the user can paste it into another window (for example, from my application to Notepad)?


How do I copy the contents of a String to the clipboard in C#?

Is there a relatively quick program out there to accomplish at least the basics of this? Just a few regexes? I&#39;m willing to do some manual conversion, but this is a pretty big set of scripts.

Conversion from JavaScript to Python code?

I&#39;d like to save some simple data. On the iPhone, I can do it with [`NSUserDefaults`][1] in Objective-C.

What is the similar command here in Android?

I&#39;m just saving a few variables, to be reused as long as the application is installed. I don&#39;t want to use a complicated database just to do that.

[1]: https://developer.apple.com/reference/foundation/nsuserdefaults?language=objc

Android equivalent of NSUserDefaults in iOS

I am not looking for a necessarily super-robust solution with a 10-year track record, but for something that can be used in a real applications, and goes beyond just being able to run an Hello World example.

My preference is to run the compiler on the server, so I can compile Haskell code ahead of time. Of course, the solution would need to be more than just a compiler, and enable Haskell code to access the API available on the browser (DOM, XHR…).

&lt;sub&gt;Footnote: the projects I have seen so far don&#39;t seem to be actively maintained, or to go beyond being able to run &quot;Hello world&quot;, or in some case even to go beyond a project description.&lt;/sub&gt;

What is the most production-level Haskell to JavaScript compiler, to write code running in the browser?

I&#39;m using [CoffeeScript][1] to make JavaScript development easier. It&#39;s a language with clean syntax that compiles into JavaScript.

So, what are the established programming languages that compile into C/C++ source code, to simplify syntax and/or enhance functionality?

  [1]: http://coffeescript.com

Content Type	Original Author	Original Content on Stackoverflow
Question	sean	View Question on Stackoverflow
Solution 1 - Java	Hendy Irawan	View Answer on Stackoverflow
Solution 2 - Java	Ben	View Answer on Stackoverflow
Solution 3 - Java	marknuzz	View Answer on Stackoverflow
Solution 4 - Java	Razzie	View Answer on Stackoverflow

Tool to convert java to c# code

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

More efficient movements editing python files in vim

How to understand the difference between class_eval() and instance_eval()?

Attributions