java - 如何将值绑定(bind)到 ObservableList 的大小？

Question

我想将一个值绑定(bind)到 ObservableList 的大小以知道它的大小并知道它是否有多个值

private ObservableList<String> strings = FXCollections.observableArrayList();

Answer 1

它们可以与 Bindings 类绑定(bind):

ObservableList<String> strings = FXCollections.observableArrayList();
IntegerBinding sizeProperty = Bindings.size(strings);
BooleanBinding multipleElemsProperty = new BooleanBinding() {
    @Override protected boolean computeValue() {
        return strings.size() > 1;
    }
};