How to make the column in the table with the formula

Hi all..
This is my class
public class MyNumber{
     private int num;

     public int getNum(){
          return num;
     }

     public void setNum( int num){
          this.num = num;
     }
}
Consider that designing a table with FXML Editor (Builder scene in this case)
and here are some of my codes
private TableView tab;
private TableColumn<MyNumber, Integer> tabColInput;
private TableColumn tabColOutput;

tab.setEditable(true);
tabColInput.setEditable(true);

tabColInput.setCellValueFactory( new PropertyValueFactory<Person,Integer>("num") );
tabColInput.setCellFactory(TextFieldTableCell.forTableColumn());
tabColInput.setOnEditCommit(
    new EventHandler<CellEditEvent<MyNumber, Integer>>() {
        @Override
        public void handle(CellEditEvent<MyNumber, Integer> t) {
            ((MyNumber) t.getTableView().getItems().get(
                t.getTablePosition().getRow())
                ).setNum(t.getNewValue());
        }
    }
);
Problem:
I want to tabColOutput to always show the result for tabColInput multiplied by 2

for example:
When I change a line in tabColInput 10, tabColOutput shows 20
When I change a line in tabColInput to 3, tabColOutput show 6

Could someone advice me how do?

PS: I'm not native English, so I'm sorry if I tell it fake ^^

You're up-to-date data are probably not ObservableValues as properties, so the TableView cannot update dynamically as modification of data items.

Tags: Java

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