(ListCell.java:480)at javafx.scene.control.ListCell$4.invalidated(ListCell.java:299)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:
调试后,我注意到我在updateItem()方法中作为参数获得的'item‘对象是空的。找不到原因。(ListCell.java:480)at javafx.scene.control.ListCell$4.invalidated(ListCell.java:299)
at javafx.beans.