FilteredListWithoutPredicate.java

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.collections.transformation.FilteredList;

public class FilteredListWithoutPredicate {
    public static void main(String[] args) {
        ObservableList<String> source = FXCollections.observableArrayList();
        source.addAll("one", "two", "three");
        System.out.println("source size: " + source.size());

        System.out.println("without predicate: "
                + new FilteredList<>(source).size());

        System.out.println("with predicate: "
                + new FilteredList<>(source, t -> true).size());
    }
}