`java.lang.UnsupportedOperationException`

Or, if you use Apache Commons Lang and the operation should be supported, but has not been implemented (yet?):

`org.apache.commons.lang.NotImplementedException`

You can use either UnsupportedOperationException or NoSuchMethodException or extend the Exception class and create your own custom exception called NotImplementedException or whatever

What&#39;s the most efficient way to sort objects in an `NSSet`/`NSMutableSet` based on a property of the objects in the set? Right now the way I am doing it is by iterating through each object, add them to a `NSMutableArray`, and sort that array with `NSSortDescriptor`.


What is the most efficient way to sort an NSSet?

I&#39;m having some trouble with the output of a DateTime value. My computer&#39;s current culture is set to de-AT (Austria).

The following code

    string s1 = DateTime.Now.ToString(&quot;d&quot;);
    string s2 = string.Format(&quot;{0:d}&quot;, DateTime.Now);

results in s1 and s2 both having the correct value of &quot;30.06.2009&quot;.

But when using the same format in XAML

        &lt;TextBlock Text=&quot;{Binding Source={x:Static sys:DateTime.Now}, StringFormat=d}&quot;/&gt;

the output is `&quot;6/30/2009&quot;. It seems the XAML StringFormat ignores the current culture settings. This happens on both Vista and XP.

I don&#39;t want to specify a custom format, because the output should be formatted in the user&#39;s preferred culture setting.

Anybody with the same problem? Is this a bug in WPF?

WPF XAML StringFormat DateTime: Output in wrong culture?

Is there (not NotImplementedException, not supported).

Java equivalent to .Net&#39;s NotSupportedException

<p>Is there (not NotImplementedException, not supported).</p>


I have an Eclipse project where I want to keep my Java project built into a JAR automatically. I know I have an option to export the project into a JAR; if I do a right click; but what I am really looking for is, that like Eclipse automatically builds a project&#39;s `.class` files and put them in target folder; it should also build a JAR automatically and copy the latest JAR at some or a specific location.

Is there a option to configure Eclipse in such a way, to build JARs automatically? 

Just to make it clear for guys, patient enough to answer my question; I am not looking at ANT as solution; as I already use it, but what I would like it something that gets initiated automatically either with a time based trigger or immediate build with change.

Build project into a JAR automatically in Eclipse

I want to have a map with duplicate keys.

I know there are many map implementations (Eclipse shows me about 50), so I bet there must be one that allows this. I know it&#39;s easy to write your own map that does this, but I would rather use some existing solution.

Maybe something in commons-collections or google-collections?



Map implementation with duplicate keys

Typically the default implementation of **`Object.hashCode()`** is some function of the allocated address of the object in memory (though this is not mandated by the *JLS*). Given that the VM shunts objects about in memory, why does the value returned by **`System.identityHashCode()`** never change during the object&#39;s lifetime?

If it is a &quot;one-shot&quot; calculation (the object&#39;s `hashCode` is calculated once and stashed in the object header or something), then does that mean it is possible for two objects to have the same `identityHashCode` (if they happen to be first allocated at the same address in memory)?


How does the JVM ensure that System.identityHashCode() will never change?

What&#39;s the main difference between Java SE and Java EE?

Is there an easy way to read a single char from the console as the user is typing it in Java? Is it possible? I&#39;ve tried with these methods but they all wait for the user to press *enter* key:
    
    char tmp = (char) System.in.read();
    char tmp = (char) new InputStreamReader(System.in).read ();
    char tmp = (char) System.console().reader().read();           // Java 6

I&#39;m starting to think that System.in is not aware of the user input until *enter* is pressed.

How to read a single char from the console in Java (as the user types it)?

I am trying to build a pie chart from a dictionary. Before I display the pie chart, I want to tidy up the data. I&#39;m removing any pie slices that would be less than 5% of the pie and putting them in a &quot;Other&quot; pie slice. However I&#39;m getting a `Collection was modified; enumeration operation may not execute` exception at runtime.

I understand why you can not add or remove items from a dictionary while iterating over them. However I don&#39;t understand why you can&#39;t simply change a value for an existing key within the foreach loop.

Any suggestions re: fixing my code, would be appreciated.

    Dictionary&lt;string, int&gt; colStates = new Dictionary&lt;string,int&gt;();
    // ...
    // Some code to populate colStates dictionary
    // ...

    int OtherCount = 0;

    foreach(string key in colStates.Keys)
    {

        double  Percent = colStates[key] / TotalCount;
        
        if (Percent &lt; 0.05)
        {
            OtherCount += colStates[key];
            colStates[key] = 0;
        }
    }

    colStates.Add(&quot;Other&quot;, OtherCount);

Editing dictionary values in a foreach loop

When using a Settings.settings file in .NET, where is the config actually stored?
I want to delete the saved settings to go back to the default state, but can&#39;t find where it&#39;s stored... any ideas?

When using a Settings.settings file in .NET, where is the config actually stored?

I just realized something crazy, which I assumed to be completely impossible : when deserializing an object, the **DataContractSerializer doesn&#39;t call the constructor** !

Take this class, for instance :

    [DataContract]
    public class Book
    {
        public Book()
        { // breakpoint here
        }

        [DataMember(Order = 0)]
        public string Title { get; set; }
        [DataMember(Order = 1)]
        public string Author { get; set; }
        [DataMember(Order = 2)]
        public string Summary { get; set; }
    }

When I deserialize an object of that class, the breakpoint is not hit. I have absolutely no idea how it is possible, since it is the only constructor for this object !

I assumed that perhaps an additional constructor was generated by the compiler because of the `DataContract` attribute, but I couldn&#39;t find it through reflection...

So, what I&#39;d like to know is this : how could an instance of my class be created without the constructor being called ??

*NOTE: I know that I can use the `OnDeserializing` attribute to initialize my object when deserialization begins, this is not the subject of my question.*

DataContractSerializer doesn&#39;t call my constructor?

By default nunit tests run alphabetically. Does anyone know of any way to set the execution order? Does an attribute exist for this?

NUnit Test Run Order

Why does Console.WriteLine work from multiple threads?

Calling Console.WriteLine from multiple threads

How can I create a new `Exception` different from the pre-made types?

    public class InvalidBankFeeAmountException extends Exception{
        public InvalidBankFeeAmountException(String message){
            super(message);
        }
     }
    
It will show the warning for the **InvalidBankFeeAmountException** which is written in the first line.

How can I write custom Exceptions?

In Java, is there any way to get(catch) all `exceptions` instead of catch the exception individually?

How can I catch all the exceptions that will be thrown through reading and writing a file?

In C#, I can use the `throw;` statement to rethrow an exception while preserving the stack trace:

    try
    {
       ...
    }
    catch (Exception e)
    {
       if (e is FooException)
         throw;
    }

Is there something like this in Java (**that doesn&#39;t lose the original stack trace**)?

Rethrowing exceptions in Java without losing the stack trace

I&#39;ve seen both exception messages with and without a period. And I can think of some reasons of why both could be good.

- No dot would give you the freedom to add the period or leave it out if you wanted to. Could be useful if the message was going in some sort of a title bar or something.
- With a dot, you would always know that you had a &quot;complete sentence&quot; and it looks more finished.

Which one do you recommend?

Could also be an issue in localized resource strings. Obviously, you can&#39;t put a period after everything (would look weird with periods after text on buttons and menu items, etc.). But should you then leave the period out from everything to be consistent and add it later where useful? Or would you rather put a period where it seems fit? For example, after all resource strings and exception messages that are sentences, but not after those that are words. But then, how about very short sentences? Like, &quot;Create a new file&quot;, for example. Could maybe leave out periods for strings that were considered actions as well... (Just thinking while I&#39;m typing here...)

Not the most important thing in the world, I know, but small things like this that tend to bug me after a while. I like consistency and to know why I do what I do. Problem is, I&#39;m not sure which one to go for :p

Do you end your exception messages with a period?

Is there a way to make [`Throwable.printStackTrace(PrintStream s)`][1] print the full stack trace, so that I can see beyond the final line of `&quot;... 40 more&quot;`?


  [1]: http://java.sun.com/javase/6/docs/api/java/lang/Throwable.html#printStackTrace%28java.io.PrintStream%29

Content Type	Original Author	Original Content on Stackoverflow
Question	ripper234	View Question on Stackoverflow
Solution 1 - Java	Thilo	View Answer on Stackoverflow
Solution 2 - Java	user121803	View Answer on Stackoverflow

Java equivalent to .Net's NotSupportedException

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

WPF XAML StringFormat DateTime: Output in wrong culture?

What is the most efficient way to sort an NSSet?

Attributions