我一直在尝试编写这个 Javafx gui 程序，但是当尝试使用 getValue() 方法时，它最终会说“它找不到那个符号”。即使我尝试使用该方法的演示。我怎样才能让这个方法工作，当用户从组合框中选择一个选项时，有没有其他方法可以让代码运行？
没有显示我的进口商品，因为它们很多。
public class LogoMaster3000 extends Application {
BorderPane border;
HBox hbox;
Canvas can;
AnchorPane ap;
Scene scene;
Button shapesComboBox;
// Desktop desktop = Desktop.getDesktop();
TextField tx;
@Override
public void start(Stage primaryStage) {
border = new BorderPane();
hbox = addHBox();
border.setTop(hbox);
border.setLeft(addVBox());
addStackPane(hbox); // Add stack to HBox in top region
can = new Canvas();
can.setStyle("-fx-background-color: #E8EACD");
AnchorPane wrapperPane = new AnchorPane();
border.setCenter(wrapperPane);
scene = new Scene(border, 1000, 600);
primaryStage.setTitle("LogoMaker 3000");
primaryStage.setScene(scene);
primaryStage.show();
shapesComboBox.setOnAction(
new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
if (shapesComboBox.getValue == "Square"){
Rectangle square = new Rectangle(50, 50);
square.setFill(Color.BLACK);
DragResizeMod.makeResizable(square, null);
wrapperPane.getChildren().add(square);
}
if (shapesComboBox.getValue == "Rectangle"){
Rectangle rectangle = new Rectangle(50, 50);
rectangle.setFill(Color.BLACK);
DragResizeMod.makeResizable(rectangle, null);
wrapperPane.getChildren().add(rectangle);
}
if (shapesComboBox.getValue == "Triangle"){
Polygon polygon = new Polygon();
polygon.getPoints().addAll(new Double[]{
75, 0,
50, 50,
100, 100
})
polygon.setFill(Color.BLACK);
DragResizeMod.makeResizable(polygon, null);
wrapperPane.getChildren().add(polygon);
}
if (shapesComboBox.getValue == "Circle"){
Circle circle = new Circle(100,100,50);
circle.setFill(Color.BLACK);
DragResizeMod.makeResizable(circle, null)
wrapperPane.getChildren().add(circle);
}
}
}
);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
public void addStackPane(HBox hb) {
StackPane stack = new StackPane();
Rectangle helpIcon = new Rectangle(30.0, 25.0);
helpIcon.setFill(new LinearGradient(0,0,0,1, true, CycleMethod.NO_CYCLE,
new Stop[]{
new Stop(0,Color.web("#4977A3")),
new Stop(0.5, Color.web("#B0C6DA")),
new Stop(1,Color.web("#9CB6CF")),}));
helpIcon.setStroke(Color.web("#D0E6FA"));
helpIcon.setArcHeight(3.5);
helpIcon.setArcWidth(3.5);
Text helpText = new Text("?");
helpText.setFont(Font.font("Verdana", FontWeight.BOLD, 18));
helpText.setFill(Color.WHITE);
helpText.setStroke(Color.web("#7080A0"));
stack.getChildren().addAll(helpIcon, helpText);
stack.setAlignment(Pos.CENTER_RIGHT); // Right-justify nodes in stack
StackPane.setMargin(helpText, new Insets(0, 10, 0, 0)); // Center "?"
hb.getChildren().add(stack); // Add to HBox from Example 1-2
HBox.setHgrow(stack, Priority.ALWAYS); // Give stack any extra space
}
public VBox addVBox() {
VBox vbox = new VBox();
vbox.setPadding(new Insets(10));
vbox.setSpacing(8);
Text title = new Text("Logo Maker");
title.setFont(Font.font("Arial", FontWeight.BOLD, 14));
vbox.getChildren().add(title);
final ComboBox shapesComboBox = new ComboBox();
shapesComboBox.getItems().addAll(
"Square",
"Rectangle",
"Triangle",
"Circle",
"Pyramid",
"Cube",
"Sphere"
);
shapesComboBox.setPromptText("Shapes");
shapesComboBox.setMaxWidth(Double.MAX_VALUE);
vbox.getChildren().add(shapesComboBox);
return vbox;
}
}