How can I calculate the value of the cell, which depends on other rows?

Question

Hi, all!
I have an application with table. In this table i have calculate some fields, that doesn't exists in data class and depends on other row values, e.g. current row number, or sum of previous rows. How can i calculate this values in TableView?
The problem is that I have no information about the current row number in the cell value factory.
Example:
public class Transaction {
     public String getName();
     public BigInteger getAmount();
} // There is no getter for "Balance"
Result table should be something like this:
Name
Amount
Balance
transaction1
300
300
transaction2
200
500
transaction3
500
1000
Also, after sorting by "Amount", "Balance" should be recalculated:
Name
Amount
Balance
transaction3
500
500
transaction1
300
800
transaction2
200
1000

Answer 1

Strings can be converted to numbers by various parse methods. For instance Strings can be converted to double via Double.parseDouble(myString).
That being said, it appears that your textfield will contain numbers and operators, and so these operators will need to be parsed too. I would advise you to search on the terms Java infix postfix.