Question

我无法找到此错误的解决方案，但我可能发现原因是什么。我想在VBox中添加多个项目：

VBox vbox = new VBox();
vbox.getChildren().addAll(ohlcBtn, labelOHLC, tradesBtn, labelTRADES);
return vbox;

如果我只添加前两项，一切正常，但java无法访问第三项（可能这就是为什么有java.lang.IndexOutOfBoundsException：索引：3，大小：2）

发生错误

primaryStage.show();

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.javafx.main.Main.launchApp(Main.java:642)
    at com.javafx.main.Main.main(Main.java:805)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IndexOutOfBoundsException: Index: 3, Size: 2
    at java.util.ArrayList.rangeCheck(ArrayList.java:604)
    at java.util.ArrayList.get(ArrayList.java:382)
    at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:208)
    at javafx.scene.Parent.impl_processCSS(Parent.java:1151)
    at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
    at javafx.scene.Parent.impl_processCSS(Parent.java:1153)
    at javafx.scene.Node.processCSS(Node.java:7383)
    at javafx.scene.Scene.doCSSPass(Scene.java:446)
    at javafx.scene.Scene.preferredSize(Scene.java:1449)
    at javafx.scene.Scene.impl_preferredSize(Scene.java:1516)
    at javafx.stage.Window$9.invalidated(Window.java:716)
    at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:127)
    at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:161)
    at javafx.stage.Window.setShowing(Window.java:779)
    at javafx.stage.Window.show(Window.java:794)
    at javafx.stage.Stage.show(Stage.java:229)
    at javamt4interface.JavaMT4Interface.start(JavaMT4Interface.java:58)
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:215)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
    ... 1 more
Java Result: 1

我已将相关方法放在此处：

public class JavaMT4Interface extends Application {

    final InputOrganizer io = new InputOrganizer();
    private Scene scene;

    @Override
    public void start(Stage primaryStage) {

        Group root = new Group();
        primaryStage.setTitle("The Forex Project");
        scene = new Scene(root, 500, 250);
        primaryStage.setScene(scene);

        BorderPane borderPane = new BorderPane();

        borderPane.setTop(getTopContent());
        borderPane.setLeft(getLeftContent());
        root.getChildren().add(borderPane);

        primaryStage.show();
    }


    private Label labelOHLC;
    private Label labelTRADES;

  public Node getTopContent() {
        Button ohlcBtn = new Button();
        ohlcBtn.setId("ohlcFileChooser");
        ohlcBtn.setText("Choose OHLC File");
        labelOHLC = new Label("", ohlcBtn);
        labelOHLC.setId("ohlcFileChosen");
        labelOHLC.setContentDisplay(ContentDisplay.LEFT);
        ohlcBtn.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                FileChooser fc = new FileChooser();
                File userDirectory = getThisDirectory();
                fc.setInitialDirectory(userDirectory);
                fc.setTitle("ohlcFile");
                File ohlcFile = fc.showOpenDialog(new Popup());
                if (ohlcFile != null) {
                    io.setOhlcFile(ohlcFile);
                    labelOHLC.setText(ohlcFile.getAbsolutePath());
                } else {
                    showDialog("No file selected.");
                }
            }
        });

        Button tradesBtn = new Button();
        tradesBtn.setId("tradesFileChooser");
        tradesBtn.setText("Choose Trade File");
        labelTRADES = new Label("", tradesBtn);
        labelTRADES.setId("ohlcFileChosen");
        labelTRADES.setContentDisplay(ContentDisplay.LEFT);
        tradesBtn.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                FileChooser fc = new FileChooser();
                File userDirectory = getThisDirectory();
                if (!userDirectory.canRead()) {
                    userDirectory = new File("c:/");
                }
                fc.setInitialDirectory(userDirectory);
                fc.setTitle("Trade File");
                File tradeFile = fc.showOpenDialog(new Popup());
                if (tradeFile != null) {
                    io.setTradesFile(tradeFile);
                    labelTRADES.setText(tradeFile.getAbsolutePath());
                } else {
                    showDialog("No file selected.");
                }
            }
        });

        VBox vbox = new VBox();
        vbox.getChildren().addAll(ohlcBtn, labelOHLC, tradesBtn, labelTRADES);
        return vbox;
    }

}

感谢您的帮助！：）

Answer 1

您正在使用标签和按钮做一些奇怪的事情。您将按钮设置为标签的图形（因此它们将显示在标签中），然后将它们添加到场景图中，标签为：

labelOHLC = new Label("", ohlcBtn);

和

labelTRADES = new Label("", tradesBtn);

以后

vbox.getChildren().addAll(ohlcBtn, labelOHLC, tradesBtn, labelTRADES);

这种方式将按钮添加到场景图中两次，我认为这会让布局混乱。（它确实应该生成IllegalStateException或IllegalArgumentException，但我想您已经找到了未正确检测到的错误配置。）

尝试制作它

labelOHLC = new Label("");

和

labelTRADES = new Label("");

Application start方法中的异常：IndexOutOfBounds

1 个答案: