javafx由以下原因引起:java.lang.UnsupportedOperationException
当我尝试向数据库添加一个“对象”,然后将其显示给TableView时,它会显示UnsupportedOperationException。一切都很好,直到我将此代码添加到“public void initialize()”以使文本字段成为“searchbox”: clearTable(): addToTableFromDatabase(): addToDatabase():javafx由以下原因引起:java.lang.UnsupportedOperationException,java,exception,javafx,javafx-8,unsupportedoperation,Java,Exception,Javafx,Javafx 8,Unsupportedoperation,当我尝试向数据库添加一个“对象”,然后将其显示给TableView时,它会显示UnsupportedOperationException。一切都很好,直到我将此代码添加到“public void initialize()”以使文本字段成为“searchbox”: clearTable(): addToTableFromDatabase(): addToDatabase(): 您已将表视图的支持列表(项)设置为排序列表,该列表不能直接修改(因为它总是假定为其基础列表的排序版本)。因此table.g
您已将表视图的支持列表(
项
)设置为排序列表,该列表不能直接修改(因为它总是假定为其基础列表的排序版本)。因此table.getItems()
返回SortedList
和table.getItems().clear()
尝试修改它并抛出异常
您应该修改基础列表,在第一个代码块中调用data
。您没有显示代码块的任何上下文,因此不清楚该变量的范围是什么,但实际上您需要data.clear()
,而不是table.getItems().clear()
(另外,您不想在
addToTableFromDatabase
中的循环中调用table.setItems(data)
,因为这将删除筛选和排序。)您已将表视图的支持列表(项
)设置为排序列表,不能直接修改(因为它总是被认为是其基础列表的排序版本)。因此table.getItems()
返回SortedList
和table.getItems().clear()
尝试修改它并抛出异常
您应该修改基础列表,在第一个代码块中调用data
。您没有显示代码块的任何上下文,因此不清楚该变量的范围,但您基本上需要data.clear()
而不是table.getItems().clear()
(另外,您不希望在addToTableFromDatabase
中的循环中调用table.setItems(data)
,因为这将删除筛选和排序。)
FilteredList <Paisjet> filteredData = new FilteredList<>(data,e -> true);
paisjaSearch.textProperty().addListener((observableValue,oldValue,newValue) ->
{
filteredData.setPredicate( paisjet ->
{
if(newValue == null || newValue.isEmpty())
{
return true;
}
String lowerCaseFilter = newValue.toLowerCase();
if(paisjet.getPaisja().toLowerCase().contains(lowerCaseFilter))
{
return true;
}
return false;
});
});
kategoriaSearch.textProperty().addListener((observableValue,oldValue,newValue) ->
{
filteredData.setPredicate( paisjet ->
{
if(newValue == null || newValue.isEmpty())
{
return true;
}
String lowerCaseFilter = newValue.toLowerCase();
if(paisjet.getKategoria().toLowerCase().contains(lowerCaseFilter))
{
return true;
}
return false;
});
});
prodhuesiSearch.textProperty().addListener((observableValue,oldValue,newValue) ->
{
filteredData.setPredicate( paisjet ->
{
if(newValue == null || newValue.isEmpty())
{
return true;
}
String lowerCaseFilter = newValue.toLowerCase();
if(paisjet.getProdhuesi().toLowerCase().contains(lowerCaseFilter))
{
return true;
}
return false;
});
});
modeliSearch.textProperty().addListener((observableValue,oldValue,newValue) ->
{
filteredData.setPredicate( paisjet ->
{
if(newValue == null || newValue.isEmpty())
{
return true;
}
String lowerCaseFilter = newValue.toLowerCase();
if(paisjet.getModeli().toLowerCase().contains(lowerCaseFilter))
{
return true;
}
return false;
});
});
SortedList <Paisjet> sortedData = new SortedList<>(filteredData);
sortedData.comparatorProperty().bind(tableView.comparatorProperty());
tableView.setItems(sortedData);
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractList.remove(AbstractList.java:161)
at java.util.AbstractList$Itr.remove(AbstractList.java:374)
at java.util.AbstractList.removeRange(AbstractList.java:571)
at java.util.AbstractList.clear(AbstractList.java:234)
at main.MainWindowController.clearTable(MainWindowController.java:315)
at main.MainWindowController.addToTableFromDatabase(MainWindowController.java:320)
at main.MainWindowController.addToDatabase(MainWindowController.java:309)
... 61 more
public void clearTable()
{
tableView.getItems().clear(); // line 315 at OUTPUT ERROR
}
public void addToTableFromDatabase() throws ClassNotFoundException, SQLException
{
clearTable(); //line 320 at OUTPUT ERROR
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://***.***.**.*:****/*********";
String uname="*****";
String pass="*********";
connect = (Connection) DriverManager.getConnection(url,uname,pass);
Statement statement;
String query = "SELECT * FROM paisjettable" ;
statement = connect.createStatement();
ResultSet rs = statement.executeQuery(query);
while(rs.next())
{
int id = rs.getInt("id");
String prodhuesi = rs.getString("prodhuesi");
String modeli = rs.getString("modeli");
String paisja = rs.getString("paisja");
String pjesa = rs.getString("pjesa");
String infoshtese = rs.getString("infoshtese");
double qmimi = rs.getDouble("qmimi");
double punedore = rs.getDouble("punedore");
double pagesa = rs.getDouble("pagesa");
int sasia = rs.getInt("sasia");
paisjet = new Paisjet(id,prodhuesi,modeli,paisja,pjesa,qmimi,punedore,pagesa,sasia,infoshtese);
data.add(paisjet);
tableView.setItems(data);
}
rs.close();
connect.close();
}
public void addToDatabase() throws ClassNotFoundException, SQLException
{
addToDatabaseMethod(count,prodhuesiField.getText(),modeliField.getText(),paisjaField.getText(),pjesaField.getText(),Double.parseDouble(qmimiField.getText()),Double.parseDouble(puneDoreField.getText()),Integer.parseInt(sasiaField.getText()),infoArea.getText());
count++;
prodhuesiField.clear();
modeliField.clear();
paisjaField.clear();
pjesaField.clear();
qmimiField.clear();
puneDoreField.clear();
sasiaField.clear();
infoArea.clear();
addToTableFromDatabase(); // line 309 from OUTPUT ERROR
}