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An elegant way to extract 'Date' attribute from a File [closed]

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So I have multiple files (on Windows 10 operating system and NTFS file system) with 'Date' attributes as here
'Date' attributes are available in Windows File Explorer in the 'Details' view after enabling them.
I'm looking for the easiest way to extract this attribute in Java (or Scala). I've read about solutions that can extract modification/creation time but neither of them mentioned a 'Date' attribute alone.

So apparently this 'Date' attribute has the same value as 'Last Saved Date' which is attribute specific to Microsoft Office or only (?) Excel files...
The method to extract this data from a file in Scala (if you use org.apache.poi.hssf library) can look something like this
def getLastSaveDateTime(file: File): Date = {
val fileInputStream = new FileInputStream(file)
try {
val workbook = new HSSFWorkbook(fileInputStream)
workbook.getSummaryInformation.getLastSaveDateTime
} finally fileInputStream.close()
}

Concurrent Hashmap clears itself. [closed]

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Closed 9 years ago.
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I have a xml reader which reads the title and the name of a person in java from a rss feed. I accomplish this by using document builder in java. When I read the element title and element name, I put them into a concurrent hashmap. This is fine, I can get the values from the map. However I want this information to be stored there for some time limit and not call the document builder until this time limit has passed. But the problem is when I do not call the document builder and refresh the webpage my hashmap values seem not to be stored. Code is in java and wicket.
Thoughts ?

It may be that every time you're refreshing the page a new hashmap is built and the old one is simply discarded. You should make sure your data stays persistent.

Writing a list to a file and reading from it [closed]

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I have looked around but have not been able to find anything related. I have 3 Lists (week, day, period) I need to write them to a file so that they are not deleted when the app is closed. How would I write these lists to a file and then when the app is open read them back into a List as they were before. Not sure if this is a stupid question.

You can find some examples in the android doc.
Basically, you can use File like in Java, for example to write (from android doc):
String FILENAME = "hello_file";
String string = "hello world!";
FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();

How to count how many times run a java file in Eclipse? [closed]

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Closed 9 years ago.
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Anyone know how to count: how many times was run a single java file in Eclipse?And write the timestamp of the executed file in a file.txt.

Use the very easy way. Just use a .properties file. With it you are able to get and set one or more values. With that you are able to count the runs. Even if you want to count it for more classs or files!
To create a properties file, do it like so:
Properties prop = new Properties();
Before you can get a value, you have to load the file, into your Properties variable:
prop.load(new FileInputStream("config.properties"));
Than you have to set (or get) the value with a key, like:
prop.setProperty("classruncounter", "5");
or to get
prop.getProperty("classruncounter");
You can read more about that in that simple tutorial. I just give you a quick overview.

You have to create one file to save the value of variable which indicates how many times you run file in eclipse and updated when you run file again.

Append to the end of the row in file [closed]

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In my project I am supposed to read a CSV file which contains a number of rows
and append to each row.
Can anyone please let me know how to append to the row of file in Java programming?
for example, if my csv file contains data as
hi,hello,how
please,help,me
i want to append after "how" and nothing in the file should be altered..

Appending a row in a CSV file, is basically inserting text at a specified location in the file. However, you can not simply insert data into a file, you have to read , modify the data and then writeto a new file in the new format. If you attempt to insert data into an existing file, the data in this place will be overwritten.