Deleting And Editing Phone Book Entries

I have a program for a phone directory. It needs to add, delete, append, and edit telephone records. I've gotten it to write and search the files. Just need to get it to delete and edit them.

Here's what I have so far:

import java.nio.file.*;
import java.io.*;
import java.nio.channels.FileChannel;
import java.nio.ByteBuffer;
import static java.nio.file.StandardOpenOption.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

[code]....