I have much better response times if I change

    folder.register(watcher, StandardWatchEventKinds.ENTRY_MODIFY);

to

    folder.register(watcher, new WatchEvent.Kind[]{StandardWatchEventKinds.ENTRY_MODIFY}, SensitivityWatchEventModifier.HIGH);

JDK 7 does not yet have a native implementation of WatchService for MacOS.  Rather than listening for native file system events, it uses the fallback sun.nio.fs.PollingWatchService, which periodically traverses the file system and checks the last modified timestamp of each file and subdirectory in the tree.  I&#39;ve also found it to be unusably slow.

There is a native implementation of WatchService for Mac:

http://code.google.com/p/barbarywatchservice/

I haven&#39;t tried to use it myself.

I understand that when the orientation of the screen changes, the current activities onDestroy() is called followed by the onCreate() to effectively recreate the activity.
I need to know how to programmatically tell if the application is being exited or if just the orientation is being changed.

One method is for the previous activity to notify me when its onResume() method is being called, this will let me know that the user has pressed the back button and the orientation hasn&#39;t been changed.

P.S. I&#39;m looking for a solution more elegant than listening for a back hardware button click.

Here was what i wanted to do:

I have two tabs, when the activity is being entered for the first time or the user has left the activity and is now entering it, a certain tab is displayed based on some criterion.

When the orientation changes, i need to stay on the same tab.


How to distinguish between orientation change and leaving application android

Is this the only way to check if an object is an instance of a class, in my case of the DateTime class?

    $cls = ReflectionClass(&quot;DateTime&quot;);
    if (! $cls-&gt;isInstance( (object) $var ) ) {
        // is not an instance
    }

It seems a bit heavy to me.

PHP check for instance of DateTime?

WatchService looks like a great technology but its been too slow to be useful on the OS X and Linux systems I&#39;ve tested on.  To add insult to injury, it doesn&#39;t seem to get notified of all events either.

This is the case both with my own code and the canonical example from Oracle. (http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/essential/io/examples/WatchDir.java)

I recognize that the OS X OpenJDK port is unsure of this functionality (see https://wikis.oracle.com/display/OpenJDK/Mac+OS+X+Port+Project+Status) 

Has anyone been using this in production with success?

Is Java 7 WatchService Slow for Anyone Else?

WatchService looks like a great technology but its been too slow to be useful on the OS X and Linux systems I've tested on. To add insult to injury, it doesn't seem to get notified of all events either.
This is the case both with my own code and the canonical example from Oracle. (<a href="http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/essential/io/examples/WatchDir.java" target="_blank" rel="noopener noreferrer">http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/essential/io/examples/WatchDir.java</a>)
I recognize that the OS X OpenJDK port is unsure of this functionality (see <a href="https://wikis.oracle.com/display/OpenJDK/Mac+OS+X+Port+Project+Status" target="_blank" rel="noopener noreferrer">https://wikis.oracle.com/display/OpenJDK/Mac+OS+X+Port+Project+Status</a>)
Has anyone been using this in production with success?

I have situation, when click on button opens the new browser window with search results.

**Is there any way to connect and focus to new opened browser window?** 

And work with it, then return back to original(first) window.


How to switch to the new browser window, which opens after click on the button?

&gt; **Possible Duplicate:**  
&gt; [Java - HashMap vs Map objects](https://stackoverflow.com/questions/1348199/java-hashmap-vs-map-objects)  

&lt;!-- End of automatically inserted text --&gt;

I want to know the difference between `HashMap` and `Map` in java..??

Difference between HashMap and Map in Java..?

I want to know if there is any Java API available to convert a POJO object to a JSON object and vice versa.

How to convert POJO to JSON and vice versa?

I need to create a temp file, so I tried this:

    String[] TempFiles = {&quot;c1234c10&quot;,&quot;c1234c11&quot;,&quot;c1234c12&quot;,&quot;c1234c13&quot;};
    for (int i = 0; i &lt;= 3; i++) {
        try {
            String tempFile = TempFiles[i]; 
            File temp = File.createTempFile(tempFile, &quot;.xls&quot;); 
  	        System.out.println(&quot;Temp file : &quot; + temp.getAbsolutePath());
        } catch (IOException e) {
	        e.printStackTrace();
        }
    }

The output is something like this:

     Temp file : C:\Users\MD1000\AppData\Local\Temp\c1234c108415816200650069233.xls
     Temp file : C:\Users\MD1000\AppData\Local\Temp\c1234c113748833645638701089.xls
     Temp file : C:\Users\MD1000\AppData\Local\Temp\c1234c126104766829220422260.xls
     Temp file : C:\Users\MD1000\AppData\Local\Temp\c1234c137493179265536640669.xls

Now, I don&#39;t want the extra numbers (long int) which is getting added to the file name. How can I achieve that? Thanks 

How to create a temp file in java without the random number appended to the filename?

I&#39;m trying to parse a JSON string like this one

    [
       {
          &quot;updated_at&quot;:&quot;2012-03-02 21:06:01&quot;,
          &quot;fetched_at&quot;:&quot;2012-03-02 21:28:37.728840&quot;,
          &quot;description&quot;:null,
          &quot;language&quot;:null,
          &quot;title&quot;:&quot;JOHN&quot;,
          &quot;url&quot;:&quot;http://rus.JOHN.JOHN/rss.php&quot;,
          &quot;icon_url&quot;:null,
          &quot;logo_url&quot;:null,
          &quot;id&quot;:&quot;4f4791da203d0c2d76000035&quot;,
          &quot;modified&quot;:&quot;2012-03-02 23:28:58.840076&quot;
       },
       {
          &quot;updated_at&quot;:&quot;2012-03-02 14:07:44&quot;,
          &quot;fetched_at&quot;:&quot;2012-03-02 21:28:37.033108&quot;,
          &quot;description&quot;:null,
          &quot;language&quot;:null,
          &quot;title&quot;:&quot;PETER&quot;,
          &quot;url&quot;:&quot;http://PETER.PETER.lv/rss.php&quot;,
          &quot;icon_url&quot;:null,
          &quot;logo_url&quot;:null,
          &quot;id&quot;:&quot;4f476f61203d0c2d89000253&quot;,
          &quot;modified&quot;:&quot;2012-03-02 23:28:57.928001&quot;
       }
    ]

into a list of objects.

    List&lt;ChannelSearchEnum&gt; lcs = (List&lt;ChannelSearchEnum&gt;) new Gson().fromJson( jstring , ChannelSearchEnum.class);

Here&#39;s an object class I&#39;m using.

    import com.google.gson.annotations.SerializedName;
    
    public class ChannelSearchEnum {
    		  
    	
    	
    @SerializedName(&quot;updated_at&quot;)
    private String updated_at;
    
    @SerializedName(&quot;fetched_at&quot;)
    private String fetched_at;
    
    @SerializedName(&quot;description&quot;)
    private String description;
    
    @SerializedName(&quot;language&quot;)
    private String language;
    
    @SerializedName(&quot;title&quot;)
    private String title;
    
    @SerializedName(&quot;url&quot;)
    private String url;
    
    @SerializedName(&quot;icon_url&quot;)
    private String icon_url;
    
    @SerializedName(&quot;logo_url&quot;)
    private String logo_url;
    
    @SerializedName(&quot;id&quot;)
    private String id;
    
    @SerializedName(&quot;modified&quot;)
    private String modified;
    
    public final String get_Updated_at() {
        return this.updated_at;
    }
    
    public final String get_Fetched_at() {
        return this.fetched_at;
    }
    
    public final String get_Description() {
        return this.description;
    }
    
    public final String get_Language() {
        return this.language;
    }
    
    public final String get_Title() {
        return this.title;
    }
    
    public final String get_Url() {
        return this.url;
    }
    
    public final String get_Icon_url() {
        return this.icon_url;
    }
    
    public final String get_Logo_url() {
        return this.logo_url;
    }
    
    public final String get_Id() {
        return this.id;
    }
    
    public final String get_Modified() {
        return this.modified;
    }
    
    		}

But it throws me with

    com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2

Any ideas how should I fix it?



GSON throwing &quot;Expected BEGIN_OBJECT but was BEGIN_ARRAY&quot;?

I used the following code to get the path             

    Path errorFilePath = FileSystems.getDefault().getPath(errorFile);

When I try to move a file using the File NIO, I get the error below:

    java.nio.file.InvalidPathException: Illegal char &lt;:&gt; at index 2: \C:\Sample\sample.txt

I also tried using [`URL.encode(errorFile)`](http://docs.oracle.com/javase/7/docs/api/java/net/URLEncoder.html#encode%28java.lang.String,java.lang.String%29) which results in the same error.


Java NIO file path issue

I would like to know the internals of the tomcat NIO connector. How exactly are threads used when we create a servlet that implements CometProcessor?Is it still one thread per connection?


From what I read, the conversation goes like this

 1. Client connects to a servlet
    
 2. Servlet hangs on to the connection till there is any data available
    to the connected client
    
 3. When data is ready , the server writes to the httpResponse and
    flushes it. This actually disconnects the connection?
    
 4. Client sends another request which the server again hangs onto..

How many thread are used when this keeps happening?

What is the difference between Tomcat&#39;s BIO Connector and NIO Connector?

How can I create a [`java.nio.file.Path`][1] object from a `String` object in Java 7?

I.e.

    String textPath = &quot;c:/dir1/dir2/dir3&quot;;
    Path path = ?;

where `?` is the missing code that uses `textPath`.

  [1]: http://docs.oracle.com/javase/7/docs/api/java/nio/file/Path.html

Create a Path from String in Java7

Rewrote question with more info

I have some code that creates a `Path` object using relative paths, like this: `Paths.get(&quot;..&quot;, &quot;folder&quot;).resolve(&quot;filename&quot;)`. Later, I want to get the path string &quot;..\folder\filename&quot; from it (I&#39;m on windows, so backslashes). When I run this code using manual compile or from Eclipse, this works fine.

However, when I run it using Maven, it doesn&#39;t work any more. The `toString()` method returns `[.., folder, filename]` instead of an actual path string. Using `path.normalize()` doesn&#39;t help. Using `path.toFile().getPath()` does return what I&#39;m looking for, but I feel there should be a solution using just the `nio.path` API.

How to get the path string from a java.nio.Path?

Directly from [this][1] Java Oracle tutorial:

&gt; Two asterisks, **, works like * but crosses directory boundaries. This
&gt; syntax is generally used for matching complete paths.

Could anybody do a real example out of it?
What do they mean with &quot;crosses directory boundary&quot;?
Crossing the directory boundary, I imagine something like checking the file from root to `getNameCount()-1`.
Again a real example explaining the difference between * and ** in *practice* would be great.

  [1]: http://docs.oracle.com/javase/tutorial/essential/io/fileOps.html#glob


When to use ** (double star) in glob syntax within JAVA

When I&#39;m trying to register a file instead of a directory `java.nio.file.NotDirectoryException` is thrown. Can I listen for a single file change, not the whole directory?

Content Type	Original Author	Original Content on Stackoverflow
Question	sbook	View Question on Stackoverflow
Solution 1 - Java	makc	View Answer on Stackoverflow
Solution 2 - Java	karlgold	View Answer on Stackoverflow

Is Java 7 WatchService Slow for Anyone Else?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

PHP check for instance of DateTime?

How to distinguish between orientation change and leaving application android

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