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Delete records with specifing record IDs in a text field and subtraction operation

 
Greenhorn
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l am doing my project in J2ME and having some problems of writing some program
as below:
1) Delete records with specifing record IDs in a text field
l have done the adding records into a record store part.But l have
a problem of writing codes to delete records from the record store
by keying in record IDs in a text field.
2) subtraction operation
l add records with prices(eg:$20.00,$30.00) and set my amount
expenses of a month(eg:$100.00) in the text fields.
then, l click a view form to check my balances in the form.
(balance= expenses - prices).It is applied to everytime
l add a new record with pricing.
is there anyone could help and guide me? or give me some source codes or related codes for above program.Because l really have no ideas on how to writing the programs and need them urgently.
thank you very much.
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