JavaFX提供了Observable接口和ObservableValue接口， 处理invalidated（数据失效）和changed（数据更新）事件。

示例一：

自定义类继承InvalidationListener接口，当数据失效时，触发该接口的invalidated事件。

Book数据类，其中的变量分别是StringProperty类型和DoubleProperty类型。分别注册InvalidationListener接口的实现ObservableEvent类。

package javafx8.ch03.observablelist;import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;/*** @copyright 2003-2023* @package   javafx8.ch03.observablelist* @file      Book.java* @date      2023-12-22 16:13* @author    qiao wei* @version   1.0* @brief     * @history*/
public class Book {public Book(String isbn, String bookTitle, double price) {isbnProperty = new SimpleStringProperty(this, "ISBN", isbn);bookTitleProperty = new SimpleStringProperty(this, "Book", bookTitle);priceProperty = new SimpleDoubleProperty(this, "Price",  price);observableEvent = new ObservableEvent();isbnProperty.addListener(observableEvent::invalidated);bookTitleProperty.addListener(observableEvent::invalidated);priceProperty.addListener(observableEvent::invalidated);}public String getIsbn() {return isbnProperty.get();}public void setIsbn(String isbn) {isbnProperty.set(isbn);}public String getBookTitle() {return bookTitleProperty.get();}public void setBookTitle(String bookTitle) {bookTitleProperty.set(bookTitle);}public double getPrice() {return priceProperty.get();}public void setPrice(double price) {priceProperty.set(price);}public static final String ISBN = "ISBN";public static final String BOOK = "Book";public static final String PRICE = "Price";private StringProperty isbnProperty;private StringProperty bookTitleProperty;private DoubleProperty priceProperty;private ObservableEvent observableEvent;
}

ObservableEvent类，继承InvalidationListener接口：

package javafx8.ch03.observablelist;import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.StringProperty;/*** @copyright 2003-2023* @package   javafx8.ch03.observablelist* @file      ObservableEvent.java* @date      2023-12-22 16:22* @author    qiao wei* @version   1.0* @brief     * @history*/
public class ObservableEvent implements InvalidationListener {@Overridepublic void invalidated(Observable observable) {String name = null;if (observable instanceof StringProperty) {name = ((StringProperty) observable).getName();} else if (observable instanceof DoubleProperty) {name = ((DoubleProperty) observable).getName();}switch (name) {case Book.ISBN:System.out.println("ISBN------------: " + ((StringProperty) observable).getName());break;case Book.BOOK:System.out.println("OKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK");break;case Book.PRICE:System.out.println(((DoubleProperty) observable).get());break;default:break;}}
}

测试代码：

package javafx8.ch03.observablelist;/*** @copyright 2003-2023* @package   javafx8.ch03.observablelist* @file      BookTest.java* @date      2023-12-22 16:35* @author    qiao wei* @version   1.0* @brief     * @history*/
public class BookTest {public static void main(String[] args) {test01();}private static void test01() {Book book01 = new Book("123", "Test01", 22.55D);book01.setIsbn("222---");book01.setPrice(22.3d);}
}

运行结果：

ISBN------------: ISBN
22.3Process finished with exit code 0

程序更新String类型、double类型数据，触发invalidated事件。