Java Programming

Write a simple line editor. Keep the entire text in an ArrayList object, one line in a separate index position. Start the program with entering EDIT file, after which a prompt appears along with the line number. if the letter I is entered with a number n following it, then insert the text to be followed on line n. If I is not followed by a number, then insert the text on the current line. If D is entered with two numbers n and m, one n, or no number following it, then delete lines n through m, line n, or the current line. Do the same with the command L, which stands for listing lines, if A is entered, then append the text to the existing lines. Entry E signifies exit and saving the text in a file.

Here is an example:

EDIT testfile

1> The first line

2>

3> And another line

4> I 3

3> The second line

4> One more line

5> L

1> The first line

2>

3> The second line

4> One more line

5> And another line //This is now line 5, not 3;

5> D 2 //Line 5, since L was issued from line 5;

4> L //Line 4, since one line was deleted;

1> The first line

2> The second line //This and the following line was deleted;

3> One more line //Now have new number;

4> And another line

5> E