Write a program in Java that simulates a simple line editor which supports the following operations:
$insert
Each subsequent line, up to the next line editor command, will be inserted in the text. If there is a designated current line, each line is inserted before that current line. Otherwise each line is inserted at the end of the text
$delete m n
Each line in text between lines m and n inclusively will be deleted
$print m n
Display the lines m and n inclusively along with their line
numbers. If the parameters m and n are missing, print the
entire text
$line m
Line m becomes the current line. The program should display up to 3 lines of text along with their line numbers before
and after the current line depending on whether there is
enough text in the linked list
$search string
Search for the string in the text. If found, display the line
that contains the first occurrence of the string
$done
Terminates the execution
Remarks:
. Check for incorrect commands and their parameters and
display appropriate messages. For example, if there is no
the 10th line in the text and the user types line 10, an
error message should be displayed
. Use a linked list to store all text provided by the user
. All commands of this simplified line editor begin with a $
symbol
. If the syntax of a command is incorrect, display an error
message and let the user try again
. Having received the command insert, if the first letter of
the next line is not a $ symbol, treat it as a line of
text, and store it in a node of the linked list
. Use StringTokenizer to process a line of text word by
word if needed.
. Always display a message "Please enter a command or a line
of text" after a command or a line of text is received
. Always indicate the current line in a displayed text. The
default current line is the first line, and the first line
is numbered as line 1.
. You cannot use the built-in list package
. Submit your program along with the output file that shows your program can do the following
Use the following test data to test your program
$insert
Golf is indeed the fastest-growing game
on an international level.
A life long game for
every golf addict
In the United States alone there are
over twenty-five millions golfers,
playing over 15,000 courses.
Once considered the game of the wealthy,
golf is changing its image.
Exclusive clubs are
no longer the mode of the day,
as architects are building
courses for the public.
$delete 3,4
$print
$delete 3,2 (wrong)
$line 3
insert (wrong)
$search Woods
$line 1
$insert
Tiger Woods is a famous golfer
as well as a wealthy person
$search Tiger
Can I input a line of text here? (wrong)
$print 2,5
$line 8
$insert
When you are out on the golf course,
it is a different world. The air is
clear, and the world is a calmer place
on the golf course, no matter how frustrated
one gets.
$print 100 (wrong)
$display (wrong)
$print
$done