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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.
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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.
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Is there an easy way to create a method that enables you to take the date of a file's creation and append it to the front of the file name? Example is a file named blah1.doc that was created on December 4, 2010 be rename to 2010124blah.doc.
If that is possible, is there a way to sort the files based upon creation date and copy them to different folders based upon filename?
Since some Linux systems do not support creation timestamps, this is not always doable.
Use Java nio if you are working on a system that does provide timestamps.
Path file = ...;
BasicFileAttributes attr = Files.readAttributes(file, BasicFileAttributes.class);
// create new file object
newFile = new File(attr.creationTime() + ".doc");
// rename file
oldFile.renameTo(newFile);
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is there any way to read from text file word by word (i.e without using split)? . I am able to read line by line directly with nextLine() with a scanner object, but I got error when I tried with next(). Thanks in advance.
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I would say I'm a newbie in programming and I need to store some data on an Id.
And then get the right data to an Id.
How can I do this?
Have you heard about Map and its Implementation. It stores the value in (Key,Value) pair.
Read this.
You can use your id as a key and its value in Map. and retrieve it using id easily.
if you need to store data in ID in android u flallow [http://developer.android.com/guide/topics/manifest/meta-data-element.html]
then you get the result
(or)
Cheak this link : (Canvas, animated text rotation)
Use HashMap. it key value date structure and stores data on the basis of id
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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.