我決定嘗試使用JavaFX,因爲我所知道的所有圖形方式都是Swing,因爲這是我在大學早期學到的,這就是我一直在使用的開發遊戲。但是,我在開始時遇到了一些麻煩,希望以前有人遇到過這些問題,以便我可以糾正它們。無法運行簡單的JavaFX程序
當我第一次啓動時,我打開Eclipse(Mars)期望能夠直接跳入它,因爲它是一個核心庫,但是當我在庫的導入中看到語法錯誤突出顯示時,Eclipse (或Java)不允許您訪問jfxrt.jar庫。在谷歌搜索後,我可以通過下載Eclipse的e(fx)clipse插件來解決這個問題。這使我可以創建一個非常簡單的JavaFX應用程序,它只顯示一個空白窗口。
但是,當試圖呈現一個簡單的圖形基元(矩形)時,我得到了一個異常,Google似乎指出它是API本身內的一個問題。有沒有人以前遇到過這個異常,並且有什麼我可以做的,以便讓JavaFX正常工作,這樣我就可以開始玩弄它了嗎?
Exception in Application start method java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Children: cycle detected: parent = [email protected][styleClass=root], node = [email protected][styleClass=root]
at javafx.scene.Parent$2.onProposedChange(Parent.java:445)
at com.sun.javafx.collections.VetoableListDecorator.add(VetoableListDecorator.java:206)
at FXMain.start(FXMain.java:23)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
... 1 more
Exception running application FXMain
這是我的計劃......
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class FXMain extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
stage.setTitle("Java FX Example");
Group root = new Group();
Scene scene = new Scene(root);
stage.setScene(scene);
Canvas canvas = new Canvas(640, 480);
root.getChildren().add(root);
GraphicsContext gc = canvas.getGraphicsContext2D();
gc.setFill(Color.RED);
gc.setStroke(Color.BLACK);
gc.setLineWidth(2);
gc.fillRect(10, 10, 50, 50);
gc.strokeRect(10, 10, 50, 50);
stage.show();
}
}
請看看這個。我認爲這個教程將會有所幫助。 http://code.makery.ch/library/javafx-8-tutorial/part1/ – sarvajeetsuman