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我创建了MapProperty以从数据库读取信息,如下所示。将数据库读取到MapProperty Javafx
命令运行正常使用地图,ArrayList的正常,但错误MapProperty.I希望委员为的ListProperty类型,所以我可以绑定它来控制
public MapProperty<String, ListProperty<String>> mapTaxonomy() {
MapProperty<String, ListProperty<String>> mapTaxonomy = new SimpleMapProperty<>();
try {
preparedStatement = connection.prepareStatement("");
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
String taxonomy = resultSet.getString("Taxonomy");
ListProperty<String> memberSelector = mapTaxonomy.get(taxonomy);
if (memberSelector == null) {
memberSelector = new SimpleListProperty<>();
mapTaxonomy.put(taxonomy, memberSelector);
}
memberSelector.add(resultSet.getString("Selector"));
}
} catch (SQLException ex) {
Logger.getLogger(ParserService.class.getName()).log(Level.SEVERE, null, ex);
}
return mapTaxonomy;
}
@Override
public void initialize(URL location, ResourceBundle resources) {
MapProperty<String, ListProperty<String>> mapTaxonomy = mapTaxonomy();
}
我运行了以下错误语句后,请帮我
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractMap.put(AbstractMap.java:209)
at javafx.beans.binding.MapExpression.put(MapExpression.java:262)
at touya.akira.storages.database.table.parser.ParserService.mapTaxonomy(ParserService.java:70)
at touya.akira.parser.styles.fixed.method.pagination.PaginationPresenter.initialize(PaginationPresenter.java:64)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 67 more
感谢@fabian你的帮助我成功了,我必须要找到的一些Oracle文档“一SimpleMapProperty的默认值是一个空的不可修改的”我不上它。如果可能的 找到教程,请帮助我的文档,我指更 https://docs.oracle.com/javafx/2/api/javafx/beans/property/SimpleMapProperty.html –
@KiênĐịnh似乎没有要在javadoc中的任何指示;我看着源代码... – fabian