TableColumn JavaFX的SetPropertyValueFactory

Question

Let's say I have a class called Employee.

Employee has a String name, int age, and a custom object Workstyle ethic. A Workstyle has a private String style.

In our GUI class, we create TableColumns:

TableColumn<Professional, String> nameColumn = new TableColumn<>("NAME");
nameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));
//
TableColumn<Employee, Integer> ageColumn = new TableColumn<>("AGE");
nameColumn.setCellValueFactory(new PropertyValueFactory<>("age"));
//

Now here's where I'm lost. I'm unable to do:

TableColumn<Employee, String> workstyleColumn = new TableColumn<>("WORKSTYLE");
workstyleColumn.setCellValueFactory(new PropertyValueFactory<>("ethic.getStyle()"));

There must be SOME way of having:

TableColumn<Object Being Looked At, Type being put onto the column> columnTitle = new TableColumn<>(
{
     // I want to put tons of code here which EVENTUALLY ends with a object of type "Type being put onto the column".
});

Thanks for the help!

Answer 1

You need

workstyleColumn.setCellValueFactory(cellData -> 
    new ReadOnlyStringWrapper(cellData.getValue().getEthic().getStyle()));

The cellValueFactory is a Callback<TableColumn.CellDataFeatures, ObservableValue> , ie a function taking a TableColumn.CellDataFeatures and returning an ObservableValue . CellDataFeatures.getValue() gives the value for the row, so cellData.getValue().getEthic().getStyle() gives the value you want. Finally you wrap it in a ReadOnlyStringWrapper to give an ObservableValue .

Answer 2

if your using PropertyValueFactory you need to write the method name without "()".

So you need an Method in Employee wich returns the style of the ethic:

class Employee{
      private Ethic ethic;
      .... 

    public String getEthicStyle(){
         return ethic != null ? ethic.getStyle : "";
   }

}

and the rest looks like this:

TableColumn<Employee, String> workstyleColumn = new TableColumn<>("WORKSTYLE");
workstyleColumn.setCellValueFactory(new PropertyValueFactory<>("ethicStyle"));

EDIT

@James_D answer isn't wrong but if you realy want to use PropertyValueFactory you have to write the extra Method in Employee