MultiToSingleTableItemSelection.java

import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.ListChangeListener;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class MultiToSingleTableItemSelection extends Application {
    @Override
    public void start(final Stage primaryStage) throws Exception {
        // table
        final TableView<Item> table = new TableView<>();
        table.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

        // table columns
        final TableColumn<Item, String> nameColumn = new TableColumn<>("Name");
        nameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));
        final TableColumn<Item, String> descriptionColumn = new TableColumn<>("Description");
        descriptionColumn.setCellValueFactory(new PropertyValueFactory<>("description"));
        table.getColumns().addAll(nameColumn, descriptionColumn);

        // selection change handling
        table.getSelectionModel().getSelectedItems().addListener(this::processListChange);

        // table items
        final Item one = new Item();
        one.name.set("name one");
        one.description.set("description one");
        final Item two = new Item();
        two.name.set("name two");
        two.description.set("description two");
        table.getItems().addAll(one, two);

        // os / version labels
        Label osLabel = new Label(System.getProperty("os.name"));
        Label jvmLabel = new Label(
                System.getProperty("java.version") +
                        "-" + System.getProperty("java.vm.version") +
                        " (" + System.getProperty("os.arch") + ")"
        );

        // scene / stage
        primaryStage.setScene(new Scene(
                new BorderPane(
                        table,
                        null,
                        null,
                        new VBox(osLabel, jvmLabel),
                        null
                )
        ));

        primaryStage.setWidth(600);
        primaryStage.setHeight(400);
        primaryStage.setTitle("Table Item Reselection");
        primaryStage.show();
    }

    private void processListChange(ListChangeListener.Change<? extends Item> c) {
        System.out.println("Change event...");
        while (c.next()) {
            System.out.println(" Change:");

            if (c.wasRemoved()) {
                c.getRemoved().forEach(item ->
                        System.out.println("  Removed: " + item.getName()));
            }
            if (c.wasAdded()) {
                c.getAddedSubList().forEach(item ->
                        System.out.println("  Added:  " + item.getName()));
            }
        }
    }

    public static class Item {
        private final StringProperty name = new SimpleStringProperty("name");
        public final ReadOnlyStringProperty nameProperty() {return name;}
        public final String getName() {return name.get();}

        private final StringProperty description = new SimpleStringProperty("description");
        public final ReadOnlyStringProperty descriptionProperty() {return description;}
        public final String getDescription() {return description.get();}
    }
}