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Reactive event streams for JavaFX

There is a newer version: 2.0-M5

package org.reactfx;

/**
 * Represents a change of a value.
 * @param  type of the value that changed.
 */
public class Change {
    private final T oldValue;
    private final T newValue;

    public Change(T oldValue, T newValue) {
        this.oldValue = oldValue;
        this.newValue = newValue;
    }

    public T getOldValue() {
        return oldValue;
    }

    public T getNewValue() {
        return newValue;
    }
}