How to store data from textfile to vector and delete a selected row.

[nemesis]

Can someone teach me how to store data from textfile to vector and delete a selected row. And after deleting, i want to write the changes in my textfile.

Do someone has an idea?

[PhHein]

Here's a tutorial with examples:
Lesson: Basic I/O (The Java™ Tutorials > Essential Classes)

[nemesis]

Thanks for the reply. But is it the same when i am using a vector?

[r035198x]

Character Streams (The Java™ Tutorials > Essential Classes > Basic I/O)

Read that page especially the Line Oriented section, make an attempt and post if you get problems with your code.

[PhHein]

Do you have to use a Vector? Vector is a bit deprecated. You can use any kind of List.

[nemesis]

Sorry sir, my teacher says we should use vectors.. I am able to add and delete files from the textfile.. But i have a big problem regarding for editing and deleting a file in my textfile.

Thanks for the time

[r035198x]

You mean you are able to add and delete lines?
Well to edit, just edit the value inside the Vector itself and then rewrite the file again the same you rewrote it after deleting lines.

[nemesis]

Can you give me some idea on how to edit sir.. Please?

[PhHein]

Basically do this:
1) read file and store every line as a String in your Vector
2) modify or delete lines as you need in the Vector
3) write every line from the Vector back into the file.

1) and 3) are covered in the tutorial
2) is your job as we cannot tell you what to change.

[nemesis]

Thanks sir. wait, i have to try this task I want to learn.. Thanks tutorial.. i'll give an update soon

Regards,
Nemesis

[r035198x]

Can you give me some idea on how to edit sir.. Please?

The first step is to find the one that you want to delete from the vector.
There are several methods already in the Vector class for doing this. Then you simply replace that element with the new one.

[PhHein]

And never ever crosspost again with out linking the threads!
Java Programming - How to store data from textfile to vector and delete a selected row.

[nemesis]

I have this problem in storing files from the textfile to vector.
Is this okay?

public static void main(String[] args) throws FileNotFoundException
	{
		Scanner inFile = new Scanner(System.in);
		Vector <Subject> subj = new Vector<Subject>()

This is for the main()..

Can someone check this code for me?

while(scanner.hasNextLine())
					{
						String lineremove = scanner.nextLine();
						z++;
						System.out.println(z + " " + lineremove);
					}
	
				System.out.println("What do you want to remove?");
				System.out.println();
				selectRemove = inFile.nextInt();
				
				
				Subject v = new Subject();
				while (scanner.hasNext())
				{
					String lineforremove = scanner.nextLine();
					v.add(lineforremove);
				}
				
				System.out.println(subj.size());
				try
				{
				
					boolean append = true;
					pw = new PrintWriter(new FileWriter(new File("subjects.txt"), append));
					pw.println(subj.toString());
				}
					catch (IOException e)
					{
						e.printStackTrace();
					}
				finally
				{
				
					pw.close();
					
				}

[r035198x]

Write at least three separate methods.

1.) Reads the file lines into a Vector.
2.) Writes the lines in the vector to a file.
3.) Edits an entry in the vector (has nothing to do with files).

[RamyaSivakanth]

Before started writing,just try to put comments before the methodd that what logic u are going to perform.How the data is formatted in ur text file like that...Then only it will be simpler for the people to give suggestions.

[gcampton]

Also as a standard, you teacher should be teaching you to write variables with camel case.(each word start uppercase except the first) lineforremove should be lineForRemove as an example as this is easier to read.

He/she should also probably not be teaching you to use depreciated classes either, sounds like he needs to brush up on his/her java skills.