JavaFX新版卡住了

Question

我正在學習Java（FX），但現在我已經智慧結束了。我有一個我不明白的錯誤。它應該繪製矩形。

錯誤：

Exception in Application start method 
java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:483) 
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363) 
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:483) 
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) 
Caused by: java.lang.RuntimeException: Exception in Application start method 
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875) 
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$147(LauncherImpl.java:157) 
at com.sun.javafx.application.LauncherImpl$$Lambda$48/815033865.run(Unknown Source) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: javafx.fxml.LoadException: 
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2595) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2435) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3208) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3169) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3142) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3118) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3098) 
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3091) 
at cihly.Cihly.start(Cihly.java:22) 
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821) 
at com.sun.javafx.application.LauncherImpl$$Lambda$51/84796442.run(Unknown Source) 
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323) 
at com.sun.javafx.application.PlatformImpl$$Lambda$45/584634336.run(Unknown Source) 
at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292) 
at com.sun.javafx.application.PlatformImpl$$Lambda$47/873652227.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291) 
at com.sun.javafx.application.PlatformImpl$$Lambda$46/501263526.run(Unknown Source) 
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) 
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
at 

我該怎麼辦？

編輯：

這裏是我的代碼：

的Class1：

public class VyplnObrazovku { 

private int zakladna; 
private int sirkaCihly; 
private int vyskaCihly; 
private int sirkaProgramu = 600; 
private int vyska; 
Canvas canvas = new Canvas(600, 330);; 
private GraphicsContext gc = canvas.getGraphicsContext2D(); 



private void nakresliCihlu(int x, int y, int vyska, int sirka) { 

    gc.setFill(Color.BLACK); 
    gc.fillRoundRect(x,y,sirka,vyska,5,5); 
    gc.setFill(Color.RED); 
    gc.fillRect(x+5, x+5, sirka-5, vyska-5); 
} 


public void rozmery(int vyska){ 
    this.zakladna = vyska; 
    this.sirkaCihly = sirkaProgramu - 10/zakladna; 
    this.vyskaCihly = sirkaCihly/2; 
    this.vyska = vyska; 
} 

public void vypln(){ 
    int odecist = 0; 
    int x = 5; 
    int y = 5; 
    for(int i = 0; i < vyska; i++){ 
     for(int j = 0; j < zakladna - odecist; j++){ 
      nakresliCihlu(x, y, this.vyskaCihly, this.sirkaCihly); 
      x += sirkaCihly; 
     } 
     y += vyskaCihly; 
     x = (int) (5 + (i*0.5)); 
     odecist++; 
    } 
} 

private void drawShapes(GraphicsContext gc) { 
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. 
} 


} 

主類：

public class Cihly extends Application { 

@Override 
public void start(Stage stage) throws Exception { 
    Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml")); 
    Scene scene = new Scene(root); 
    stage.setScene(scene); 
    stage.setResizable(false); 
    stage.show(); 
} 

public static void main(String[] args) { 
    launch(args); 
} 
} 

控制器：

public class FXMLDocumentController implements Initializable { 

@FXML 
private Label labelCislo; 

@FXML 
private void handleButtonAction(ActionEvent event) { 

} 

@Override 
public void initialize(URL url, ResourceBundle rb) { 
    VyplnObrazovku plnic = new VyplnObrazovku(); 
    plnic.rozmery(5); 
    plnic.vypln(); 
}  
} 

編輯2：

我正在檢查FXMLDocument.fxml，但我找不到任何錯誤。我會很感激每一個建議。 FXMLDocument.fxml

<?xml version="1.0" encoding="UTF-8"?> 
<?import javafx.scene.canvas.*?> 
<?import javafx.scene.shape.*?> 
<?import java.lang.*?> 
<?import java.util.*?> 
<?import javafx.scene.*?> 
<?import javafx.scene.control.*?> 
<?import javafx.scene.layout.*?> 

<AnchorPane id="AnchorPane" prefHeight="320.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="cihly.FXMLDocumentController"> 
    <children> 
     <Canvas height="330.0" layoutY="34.0" width="600.0" /> 
     <HBox layoutX="2.0" layoutY="6.0" prefHeight="38.0" prefWidth="600.0"> 
     <children> 
      <Label prefHeight="14.0" prefWidth="199.0" text="Zadejte výšku zdi v rozmezí 1 až 500:" /> 
      <TextField fx:id="labelCislo" /> 
      <Button fx:id="handleButtonAction" mnemonicParsing="false" text="OK" /> 
     </children> 
     </HBox> 
    </children> 
</AnchorPane> 

Answer 1

的問題是，在FXML文件中已定義的fx:id = labelCislo一個TextField但在控制器類，你正在試圖注入這個FX：id變量爲Label。所以FXMLLoader不能將標籤轉換爲文本字段。如果您發佈了完整的異常錯誤文本，這對我們來說會更具描述性。然而，你截斷它...