JavaFx: Table view with different cell data type by row on the same column, HOW TO? - class

Question

How to get different data class type on each row of the same column for a JavaFx table view?

Answer 1

Based on this post, here is a simple example that demonstrate how to get different data class type by row on the same column in a javaFx table view:
package application;
import java.time.LocalDateTime;
import javafx.application.Application;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TablePosition;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
public class Main extends Application {
private final TableView<Person<?>> tableView = new TableView<>();
private Person<Integer> person1 = new Person<>("Jacob", "Smith", 28, 4);
private Person<Integer> person2 = new Person<>("Isabella", "Johnson", 19, 5);
private Person<String> person3 = new Person<>("Bob", "The Sponge", 13, "Say Hi!");
private Person<LocalDateTime> person4 = new Person<>("Time", "Is Money", 45, LocalDateTime.now());
private Person<Double> person5 = new Person<>("John", "Doe", 32, 457.89);
private final ObservableList<Person<?>> data = FXCollections.observableArrayList(person1, person2, person3, person4,
person5);
#SuppressWarnings("unchecked")
#Override
public void start(Stage primaryStage) {
TableColumn<Person<?>, String> firstNameCol = new TableColumn<>("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
TableColumn<Person<?>, String> lastNameCol = new TableColumn<>("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
TableColumn<Person<?>, Integer> ageCol = new TableColumn<>("Age");
ageCol.setMinWidth(50);
ageCol.setCellValueFactory(new PropertyValueFactory<>("age"));
TableColumn<Person<?>, ?> particularValueCol = new TableColumn<>("Particular Value");
particularValueCol.setMinWidth(200);
particularValueCol.setCellValueFactory(new PropertyValueFactory<>("particularValue"));
tableView.setItems(data);
// Type safety: A generic array of Table... is created for a varargs
// parameter
// -> #SuppressWarnings("unchecked") to start method!
tableView.getColumns().addAll(firstNameCol, lastNameCol, ageCol, particularValueCol);
// Output in console the selected table view's cell value/class to check
// that the data type is correct.
SystemOutTableViewSelectedCell.set(tableView);
// To check that table view is correctly refreshed on data changed..
final Button agePlusOneButton = new Button("Age +1");
agePlusOneButton.setOnAction((ActionEvent e) -> {
Person<?> person = tableView.getSelectionModel().getSelectedItem();
try {
person.setAge(person.getAge() + 1);
} catch (NullPointerException npe) {
//
}
});
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 0, 0, 10));
vbox.getChildren().addAll(tableView, agePlusOneButton);
Scene scene = new Scene(new Group());
((Group) scene.getRoot()).getChildren().addAll(vbox);
primaryStage.setWidth(600);
primaryStage.setHeight(750);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
public static class Person<T> {
private final StringProperty firstName;
private final StringProperty lastName;
private final IntegerProperty age;
private final ObjectProperty<T> particularValue;
private Person(String firstName, String lastName, Integer age, T particularValue) {
this.firstName = new SimpleStringProperty(firstName);
this.lastName = new SimpleStringProperty(lastName);
this.age = new SimpleIntegerProperty(age);
this.particularValue = new SimpleObjectProperty<T>(particularValue);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String firstName) {
this.firstName.set(firstName);
}
public StringProperty firstNameProperty() {
return firstName;
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String lastName) {
this.lastName.set(lastName);
}
public StringProperty lastNameProperty() {
return lastName;
}
public Integer getAge() {
return age.get();
}
public void setAge(Integer age) {
this.age.set(age);
}
public IntegerProperty ageProperty() {
return age;
}
public T getParticularValue() {
return particularValue.get();
}
public void setParticularValue(T particularValue) {
this.particularValue.set(particularValue);
}
public ObjectProperty<T> particularValueProperty() {
return particularValue;
}
}
public static final class SystemOutTableViewSelectedCell {
#SuppressWarnings({ "rawtypes", "unchecked" })
public static void set(TableView tableView) {
tableView.getSelectionModel().setCellSelectionEnabled(true);
ObservableList selectedCells = tableView.getSelectionModel().getSelectedCells();
selectedCells.addListener(new ListChangeListener() {
#Override
public void onChanged(Change c) {
TablePosition tablePosition = (TablePosition) selectedCells.get(0);
Object val = tablePosition.getTableColumn().getCellData(tablePosition.getRow());
System.out.println("Selected Cell (Row: " + tablePosition.getRow() + " / Col: "
+ tablePosition.getColumn() + ") Value: " + val + " / " + val.getClass());
}
});
}
}
}