【发布时间】:2020-08-20 10:58:09
【问题描述】:
总结:
我正在尝试使用 ObservableList 填充 TableView,其中包含具有 SimpleStringProperty 类型字段的“Contact”类对象。
不幸的是,它不起作用。我得到了错误:
WARNING: Can not retrieve property 'firstName' in PropertyValueFactory: javafx.scene.control.cell.PropertyValueFactory@61e63bbc with provided class type: class sample.Datamodel.Contact
java.lang.RuntimeException: java.lang.IllegalAccessException: module javafx.base cannot access class sample.Datamodel.Contact (in module JavaFXChallengeContactList) because
at javafx.base/com.sun.javafx.property.PropertyReference.getProperty(PropertyReference.java:199)
at javafx.controls/javafx.scene.control.cell.PropertyValueFactory.getCellDataReflectively(PropertyValueFactory.java:182)
... and many more
我对这个主题进行了广泛的研究。在许多情况下,其他人没有在类中实现 variableProperty() 方法。但它就在那里。
我已经创建了一个创建列的方法,但是其他尝试(没有它并将代码直接放在 initialize() 方法中)也没有奏效。
当我运行代码时,我得到带有标题的表格,但没有数据。
这里有什么问题?
非常感谢您的支持!
联系人类中的代码:
public class Contact {
private SimpleStringProperty firstName;
private SimpleStringProperty lastName;
private SimpleStringProperty phoneNumber;
private SimpleStringProperty notes;
public Contact(SimpleStringProperty firstName, SimpleStringProperty lastName, SimpleStringProperty phoneNumber, SimpleStringProperty notes) {
this.firstName = firstName;
this.lastName = lastName;
this.phoneNumber = phoneNumber;
this.notes = notes;
}
public String getFirstName() {
return firstName.get();
}
public SimpleStringProperty firstNameProperty() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName.set(firstName);
}
... (other methods for lastName, phoneNumer and notes are identical)
ContactData 类中的代码:
public class ContactData {
private ObservableList<Contact> contacts;
public ContactData() {
this.contacts = FXCollections.observableArrayList();
}
public void addContact(String fName, String lName, String phone, String notes) {
SimpleStringProperty firstName = new SimpleStringProperty(fName);
SimpleStringProperty lastName = new SimpleStringProperty(lName);
SimpleStringProperty phoneNumber = new SimpleStringProperty(phone);
SimpleStringProperty yourNotes = new SimpleStringProperty(notes);
this.contacts.add(new Contact(firstName, lastName, phoneNumber, yourNotes));
}
public ObservableList<Contact> getContacts() {
return contacts;
}
控制器中的代码:
public class Controller {
@FXML
private TableView table;
public void initialize() {
ContactData contactDatabase = new ContactData();
contactDatabase.addContact("John", "Doe", "123", "Hi John");
contactDatabase.addContact("Peter", "Mustang", "321", "Hello Pete");
contactDatabase.addContact("Carl", "Mueller", "555", "Hey Carl");
TableColumn firstCol = setUpColumn("First Name","firstName");
TableColumn secondCol = setUpColumn("Last Name","lastName");
TableColumn thirdCol = setUpColumn("Phone Number","phoneNumber");
TableColumn lastCol = setUpColumn("Your Notes","notes");
table.setItems(contactDatabase.getContacts());
table.getColumns().addAll(firstCol, secondCol, thirdCol, lastCol);
}
public TableColumn setUpColumn(String columnName, String idInContact) {
TableColumn<Contact, SimpleStringProperty> column = new TableColumn<>(columnName);
column.setCellValueFactory(new PropertyValueFactory<>(idInContact));
return column;
}
【问题讨论】:
-
错误信息不完整:本例中的重要部分是java.lang.RuntimeException: java.lang.IllegalAccessException: module javafx.base cannot access class sample.Datamodel.Contact(在模块 JavaFXChallengeContactList) 因为 after because 的文本会告诉你确切的问题:) 确保联系人的包已导出或至少在你的模块信息中打开
-
是的!非常感谢,成功了!解决方案是在 module-info.java 中添加一行:opens sample.Datamodel;
-
注意一个很多更好的解决方案是避免使用
PropertyValueFactory。使用正确类型的表列(即TableColumn<Contact, String>,而不是原始类型TableColumn),然后您可以使用firstCol.setCellValueFactory(cellData -> cellData.getValue().firstNameProperty())等。
标签: java javafx illegalaccessexception