Do we write classes in abap seperately from the main program

For instance following class is designed to capture the click of hotspot and double clicks from a screen layout. immediately I need it.Thanks everyone.
Where should I put such a code?
CLASS lcl_event_handler DEFINITION .
PUBLIC SECTION .
METHODS:
*--Hotspot click control
handle_hotspot_click
FOR EVENT hotspot_click OF cl_gui_alv_grid
IMPORTING e_row_id e_column_id es_row_no ,
*--Double-click control
handle_double_click
FOR EVENT double_click OF cl_gui_alv_grid
IMPORTING e_row e_column es_row_no.
PRIVATE SECTION.
ENDCLASS.
CLASS lcl_event_handler IMPLEMENTATION .
*--Handle Hotspot Click
METHOD handle_hotspot_click .
PERFORM handle_hotspot_click USING e_row_id e_column_id es_row_no .
ENDMETHOD .
*--Handle Double Click
METHOD handle_double_click .
PERFORM handle_double_click USING e_row e_column es_row_no .
ENDMETHOD .
ENDCLASS .
FORM CREATEOBJECT.
DATA gr_event_handler TYPE REF TO lcl_event_handler .
*--Creating an instance for the event handler
CREATE OBJECT gr_event_handler .
SET HANDLER gr_event_handler->handle_double_click FOR gr_alvgrid .
SET HANDLER gr_event_handler->handle_hotspot_click FOR gr_alvgrid .
ENDFORM.
FORM handle_hotspot_click USING i_row_id TYPE lvc_s_row
i_column_id TYPE lvc_s_col
is_row_no TYPE lvc_s_roid.
READ TABLE zbficheentry_list2 INDEX is_row_no-row_id .
IF sy-subrc = 0." AND i_column_id-fieldname = 'SEATSOCC'.
CALL SCREEN 200 . "Details about passenger-seat matching
ENDIF .
ENDFORM .
FORM handle_double_click USING i_row TYPE lvc_s_row
i_column TYPE lvc_s_col
is_row_no TYPE lvc_s_roid.
READ TABLE zbficheentry_list2 INDEX is_row_no-row_id .
IF sy-subrc = 0." AND i_column-fieldname = 'SEATSOCC' .
CALL SCREEN 120 . "Details about passenger-seat matching
ENDIF .
ENDFORM .

Hi,
Check the link,
Re: hotspot
Regards,
Azaz Ali.

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Accessing Classes From the Main Program:

Hey Guys if you want to take a crack at this: I'm not sure how to exaclty get the classes read into my program and stuff. So I dunno if not don't worry. And Also ther'es no need to insult me.
* just copy this into any editor
import java.io.*;
import java.text.*;
class Liststuff
public class Node
char info;
Node next;
public class listException extends Exception
public listException(String message)
super(message);
class Queue
private Liststuff.Node front;
private Liststuff.Node rear;
public Queue()
front = null;
rear = null;
public boolean isEmpty()
return (front == null);
public void insert(char v)
Liststuff.Node n = new Liststuff.Node();
n.info = v;
n.next = front;
if (rear == null)
front = n;
else
rear.next = n;
public char Remove() throws Liststuff.listException
char v;
if (isEmpty())
throw new Liststuff.listException("Nothing in OrigQue.");
else
v = rear.info;
rear = rear.next;
return (v);
class Stack
Liststuff.Node top = new Liststuff.Node();
public Stack()
top = null;
public void push(char v)
Liststuff.Node n = new Liststuff.Node();
n.info = v;
n.next = top;
top = n;
public char pop() throws Liststuff.listException
char v;
if (isEmpty())
throw new Liststuff.listException("Stack underflow.");
else
v = top.info;
top = top.next;
return (v);
public boolean isEmpty()
return (top == null);
class Deque
private Liststuff.Node front = new Liststuff.Node();
private Liststuff.Node rear = new Liststuff.Node();
private Liststuff.Node f = new Liststuff.Node();
public Deque()
front = null;
f = null;
rear = null;
public void insert(char v)
Liststuff.Node n = new Liststuff.Node();
n.info = v;
n.next = front;
if (rear == null)
front = n;
else
rear.next = n;
public char remove(char side) throws Liststuff.listException
char v;
if (isEmpty())
throw new Liststuff.listException("Nothing in OrigQue.");
else
f = rear;
if (side == 'R')
while (f.next != front)
f = f.next;
v = front.info;
front = f;
else
v = rear.info;
rear = rear.next;
return (v);
public boolean isEmpty()
return (front == rear);
public class Prog8
public static void main(String args[]) throws IOException, Liststuff.listException
String line;
int i;
char t;
Liststuff s = new Liststuff();
BufferedReader br = new BufferedReader(new FileReader("numbers.txt"));
line = br.readLine();
StringCharacterIterator c = new StringCharacterIterator(line);
while (line != null)
for (i = 0; i <= c.getEndIndex(); i++)
Liststuff.Queue Orig = new Liststuff.Queue();
Liststuff.Stack Evenstk = new Liststuff.Stack();
Liststuff.Deque Oddque = new Liststuff.Deque();
Liststuff.Queue Final = new Liststuff.Queue();
t = c.current();
char v = (t);
c.next();
Orig.insert(v);
line = br.readLine();
if ((v % 2) == 0)
Evenstk.push(v);
else
Oddque.insert(v);
Final.insert(Evenstk.pop());
while (!Oddque.isEmpty())
Final.insert(Oddque.remove('R'));
Final.insert(Oddque.remove('L'));
System.out.print("Original Sequence: ");
while (!Orig.isEmpty())
System.out.print(Orig.Remove());
System.out.print("New Sequence: ");
while (!Final.isEmpty())
System.out.print(Final.Remove());
}

hi mate
System.out.print("Original Sequence: ");
while (!Orig.isEmpty())
System.out.print(Orig.Remove());
System.out.print("New Sequence: ");
while (!Final.isEmpty())
System.out.print(Final.Remove());
thats you wacky code remember its insult free comments
well here the best way to do it
for Final.insert(Oddque.remove('R'));
System.out.print("Original Sequence: ");
while (!Orig.isEmpty())
System.out.print(Orig.Remove());
while Final.insert(Oddque.remove('L'));
System.out.print("New Sequence: ");
while (!Final.isEmpty())
System.out.print(Final.Remove());
else bla bla bla
hope it cann hep though i dont whats is the problem
and be clear you question.

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Edited by: okun on May 16, 2010 8:40 PM
Edited by: okun on May 16, 2010 8:41 PM
Edited by: okun on May 16, 2010 8:47 PM

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Do we write classes in abap seperately from the main program

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