Testing Change Events for JavaFX Properties - Java JavaFX

Java examples for JavaFX:Bindable Properties

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Description

Testing Change Events for JavaFX Properties

Demo Code

import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.value.ObservableValue;

public class Main {
  public static void main(String[] args) {
    // Create a counter property
    IntegerProperty counter = new SimpleIntegerProperty(100);

    // Add a change listener to the counter property
    counter.addListener(Main::changed);//from  w w  w  . java 2s  .c o m

    System.out.println("Before changing the counter value-1");
    counter.set(101);
    System.out.println("After changing the counter value-1");

    System.out.println();
    System.out.println("Before changing the counter value-2");
    counter.set(102);
    System.out.println("After changing the counter value-2");

    // Try setting the same value
    System.out.println();
    System.out.println("Before changing the counter value-3");
    counter.set(102); // No change event will be fired.
    System.out.println("After changing the counter value-3");

    // Try setting a different value
    System.out.println();
    System.out.println("Before changing the counter value-4");
    counter.set(103);
    System.out.println("After changing the counter value-4");
  }

  public static void changed(ObservableValue<? extends Number> prop,
                           Number oldValue,
                           Number newValue) {
    System.out.print("Counter changed: ");
    System.out.println("Old = " + oldValue + ", new = " + newValue);
  }
}

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