ALV Tree list output using the Class and method

Question

Hi,
How to get the internal table values of ALV Tree List in classes.
My requirement is i need to store the output values in Ztable of a SAP Transaction of CK86_99.
for this, i copied the SAP Standard Transaction into Z tcode and i am trying to poplulate the output display into Ztable. But this standard tcode CK86_99 is using the classes of ALV tree list to display output.
CL_STRUCTURE_EXPLOSION_TREE -- Class
CONSTRUCTOR - method
Finally in the above mentioned method, i am able to see the output values of ALV tree list in the internal table of mt_output_table.
But these are SAP Standard Class and method.
My doubt is, How to get these internal table values in my Zprogram.
is there any user exit or badi can we use in the method of class???? Actually my system is 4.6C
Please suggest me on this problem.
Thanks in advance
KBS Reddy

Answer 1

First your getInstance() method returns 'singleton' which you havent declared/init anywhere.
your getAll() method needs to be static if you need to call it the way you are doing.
In your getAll() method u are passing a parameter called patientRecord ... where have you declared/init it.
i think you have to do something like this ... if i have understood you correctly.
/* THIS IS IN YOUR SERVLET*/
Collections c = database.getAll();
out.println(C);
/* YOUR FlatfileDatabase CLASS HAS SOMETHING LIKE THIS*/
public static FlatfileDatabase getInstance() {
return new FlatfileDatabase();
public static Collections getAll() {