JavaFX callback lambda expression

So I'm trying to update the old JavaFX application I created on the Java 6 release I got a hint that I can convert the current code and use lambda expressions. Can someone help me convert this code here or guide me in some way?

// define a simple boolean cell value for the action column so that the column will only be shown for non-empty rows.
    addColumn.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<UserDetails,Boolean>,ObservableValue<Boolean>>() {
        @Override public ObservableValue<Boolean> call(TableColumn.CellDataFeatures<UserDetails,Boolean> features) {
            return new SimpleBooleanProperty(features.getValue() != null);
        }
    });

    // create a cell value factory with an add button for each row in the table.
    addColumn.setCellFactory(new Callback<TableColumn<UserDetails,TableCell<UserDetails,Boolean>>() {
        @Override public TableCell<UserDetails,Boolean> call(TableColumn<UserDetails,Boolean> personBooleanTableColumn) {
            return new AddPersonCell(window,tableUser);
        }
    });

Solution

Lambda expressions are valid only if there is an abstract method in the interface Since this is a callback situation, this can be a

Basically, you put the anonymous class in the form of lambda expression (< parameters >) – > < method body >

under these circumstances

new Callback<TableColumn.CellDataFeatures<UserDetails,ObservableValue<Boolean>>() {
    @Override public ObservableValue<Boolean> call(TableColumn.CellDataFeatures<UserDetails,Boolean> features) {
        return new SimpleBooleanProperty(features.getValue() != null);
    }
}

change

(TableColumn.CellDataFeatures<UserDetails,Boolean> features) -> {
    return new SimpleBooleanProperty(features.getValue() != null);
}

This can further simplify:

>If you do not need parameter types to determine the methods to call, you can delete them. > If only one parameter has no type, you can delete () parentheses. > If the method body contains only one statement, {} and; Can be deleted If the statement is a return statement, you also need to delete the return keyword

This allows you to further simplify lambda expressions

features -> new SimpleBooleanProperty(features.getValue() != null)

Use the same method

new Callback<TableColumn<UserDetails,Boolean>>() {
    @Override public TableCell<UserDetails,Boolean> personBooleanTableColumn) {
        return new AddPersonCell(window,tableUser);
    }
}

Can be changed to

personBooleanTableColumn -> new AddPersonCell(window,tableUser)