如何通过JavaFX应用程序将变量传递给控制器?
我想问一下,是否可以通过JavaFX类传递一个变量,是什么将应用程序扩展到了我的JavaFX控制器?我对JavaFx非常陌生,可能只需要一点时间 目标是将Id从MyClass传递给MyController 我的申请类别:如何通过JavaFX应用程序将变量传递给控制器?,java,variables,controller,javafx,fxml,Java,Variables,Controller,Javafx,Fxml,我想问一下,是否可以通过JavaFX类传递一个变量,是什么将应用程序扩展到了我的JavaFX控制器?我对JavaFx非常陌生,可能只需要一点时间 目标是将Id从MyClass传递给MyController 我的申请类别: public class MyClass extends Application { private String myVariable="Anything"; public static void main(String[] args) {
public class MyClass extends Application {
private String myVariable="Anything";
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
URL location = getClass().getResource("MyGui.fxml");
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(location);
fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
Parent root = FXMLLoader.load(location);
Scene scene = new Scene(root);
stage.setTitle(title);
stage.setScene(scene);
stage.show();
}
}
我的控制器:
public class Controller extends Group implements Binding {
public void initialize(Map<String, Object> namespace, URL location, Resources resources) {
// HERE I'D LIKE TO GET MY VARIABLE LIKE
System.out.println(myVariable);
}
@Override
public List<Handler> getHandlerChain() {
return null;
}
@Override
public void setHandlerChain(List<Handler> chain) {
}
@Override
public String getBindingID() {
return null;
}
}
公共类控制器扩展组实现绑定{
公共void初始化(映射命名空间、URL位置、资源){
//这里我想得到我的变量
System.out.println(myVariable);
}
@凌驾
公共列表getHandlerChain(){
返回null;
}
@凌驾
公共无效setHandlerChain(列表链){
}
@凌驾
公共字符串getBindingID(){
返回null;
}
}
首先,您必须在MyClass中添加setter和getter(因为var是private
),并将其更改为static:
private static String myVariable;
public String getMyVariable() {
return myVariable;
}
public void setMyVariable(String myVariable) {
this.myVariable = myVariable;
}
然后,由于MyClass是静态的,因此可以执行以下操作:
System.out.println(MyClass.getMyVariable());
工作示例:
MyClass.java
import java.net.URL;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.fxml.JavaFXBuilderFactory;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class MyClass extends Application {
private static String myVariable;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
setMyVariable("Anything");
URL location = getClass().getResource("MyGui.fxml");
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(location);
fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
Parent root = FXMLLoader.load(location);
Scene scene = new Scene(root);
stage.setTitle("Hello Word");
stage.setScene(scene);
stage.show();
}
public static String getMyVariable() {
return myVariable;
}
public static void setMyVariable(String myVariable) {
MyClass.myVariable = myVariable;
}
}
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
public class MyController implements Initializable{
@FXML Label labelVar;
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
labelVar.setText(labelVar.getText() + MyClass.getMyVariable());
}
}
MyController.java
import java.net.URL;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.fxml.JavaFXBuilderFactory;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class MyClass extends Application {
private static String myVariable;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
setMyVariable("Anything");
URL location = getClass().getResource("MyGui.fxml");
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(location);
fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
Parent root = FXMLLoader.load(location);
Scene scene = new Scene(root);
stage.setTitle("Hello Word");
stage.setScene(scene);
stage.show();
}
public static String getMyVariable() {
return myVariable;
}
public static void setMyVariable(String myVariable) {
MyClass.myVariable = myVariable;
}
}
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
public class MyController implements Initializable{
@FXML Label labelVar;
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
labelVar.setText(labelVar.getText() + MyClass.getMyVariable());
}
}
MyGui.fxml
这似乎是可以比较的:没有必要使用公认答案中提出的静态变量。查看详细的post答案和非常详细的post答案这将不起作用,因为getter和setter不是静态的,因此无法从类名中引用方法。@CAGGonzo,只要将它们设置为静态
。谢谢你指出我在最初的答案中漏掉了它。非常感谢你,我自己做了,但方式相同。没有必要使用静态变量。请参阅详细的帖子答案和非常详细的帖子答案