java 更改标签文本 JavaFX FXML
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Changing Label text JavaFX FXML
提问by M. Barabas
There is my main class:
有我的主要课程：
public class Main extends Application {
private static Stage primaryStage;
public static BorderPane mainLayout;
@Override
public void start(Stage primaryStage) {
this.setPrimaryStage(primaryStage);
primaryStage.setTitle("Project");
try {
mainLayout =
FXMLLoader.load(Main.class.getResource("/main/view/MainPage.fxml"));
} catch (IOException e) {
e.printStackTrace();
}
Scene scene = new Scene(mainLayout);
primaryStage.setScene(scene);
primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
@Override
public void handle(WindowEvent event) {
System.exit(0);
}
});
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
public static Stage getPrimaryStage() {
return primaryStage;
}
public void setPrimaryStage(Stage primaryStage) {
Main.primaryStage = primaryStage;
}
}
This FXML of my window:
我的窗口的这个 FXML：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>
<BorderPane prefHeight="410.0" prefWidth="512.0"
xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1"
fx:controller="main.controller.MainController">
<center>
<VBox alignment="CENTER" prefHeight="200.0" prefWidth="100.0"
spacing="20.0" BorderPane.alignment="CENTER">
<children>
<Label fx:id="aaa" prefHeight="72.0" prefWidth="336.0"
text="Project" textAlignment="CENTER">
<font>
<Font name="Century Gothic" size="25.0" />
</font>
</Label>
</children>
<padding>
<Insets bottom="30.0" />
</padding>
</VBox>
</center>
</BorderPane>
This is Controller for this FXML:
这是此 FXML 的控制器：
public class MainController {
@FXML
private static Label aaa;
@FXML
public static void initialize(){
aaa.setText("AHOJ");
}
}
I want to call method initialize() from another class ten times like this:
我想像这样从另一个类调用方法 initialize() 十次：
public class MyClass {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
MainController.initialize();
}
}
}
But there is NullPointerException. Can someone help me?
但是有 NullPointerException。有人能帮我吗？
回答by Dmytro Maslenko
Just remove statics for field and method, then run your application by main() in Main class:
只需删除字段和方法的静态，然后在 Main 类中通过 main() 运行您的应用程序：
public class MainController {
@FXML
private Label aaa;
@FXML
public void initialize(){
aaa.setText("AHOJ");
}
}
