问题
I\'m new in java, so I have to ask you for help :P. I\'m creating very simple program, but I stucked on verifying password and login textField. I\'m wondering what is wrong with that code, can you help me?
Controller
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.PasswordField;
import java.awt.*;
public class Controller {
@FXML
public TextField login,password;
public void LoginButtonClicked(ActionEvent event)
{
if(login.getText().equals(\"yes\")&&password.getText().equals(\"yes\"))
{
System.out.print(\"Congratulations\");
}
else
{
System.out.print(\"no\");
}
}
}
FXML
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<?import javafx.scene.text.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<BorderPane maxHeight=\"-Infinity\" maxWidth=\"-Infinity\" minHeight=\"-Infinity\" minWidth=\"-Infinity\" prefHeight=\"400.0\" prefWidth=\"600.0\" xmlns=\"http://javafx.com/javafx/8\" xmlns:fx=\"http://javafx.com/fxml/1\" fx:controller=\"sample.Controller\">
<top>
<VBox BorderPane.alignment=\"CENTER\">
<children>
<MenuBar>
<menus>
<Menu mnemonicParsing=\"false\" text=\"Profile\">
<items>
<MenuItem mnemonicParsing=\"false\" text=\"Your Profile\" />
<MenuItem mnemonicParsing=\"false\" text=\"Log out\" />
<MenuItem mnemonicParsing=\"false\" text=\"Close\" />
</items>
</Menu>
<Menu mnemonicParsing=\"false\" text=\"Help\">
<items>
<MenuItem mnemonicParsing=\"false\" text=\"About program\" />
<MenuItem mnemonicParsing=\"false\" text=\"Author\" />
</items>
</Menu>
</menus>
</MenuBar>
<HBox spacing=\"8.0\">
<children>
<TextField fx:id=\"login\" promptText=\"User\" /> // ERROR
<TextField fx:id=\"password\" layoutX=\"10.0\" layoutY=\"10.0\" promptText=\"Password\" /> //ERROR
<Region HBox.hgrow=\"ALWAYS\" />
<Button mnemonicParsing=\"false\" onAction=\"#LoginButtonClicked\" text=\"Log In\" />
<Button layoutX=\"329.0\" layoutY=\"15.0\" mnemonicParsing=\"false\" text=\"Clear\" />
</children>
<padding>
<Insets bottom=\"5.0\" left=\"5.0\" right=\"5.0\" top=\"5.0\" />
</padding>
</HBox>
</children>
</VBox>
</top>
<center>
<Label alignment=\"CENTER\" prefHeight=\"130.0\" prefWidth=\"469.0\" text=\"Log in, in order to use this program\" BorderPane.alignment=\"CENTER\">
<font>
<Font size=\"25.0\" />
</font>
</Label>
</center>
</BorderPane>
And the error code
Exception in Application start method
Exception in thread \"main\" 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$$Lambda$1/868693306.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException:
/C:/Users/Michael/IdeaProjects/Endomondo/out/production/Endomondo/sample/sample.fxml:36
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2595)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2435)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3208)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3169)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3142)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3118)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3098)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3091)
at sample.Main.start(Main.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
at com.sun.javafx.application.LauncherImpl$$Lambda$50/1482523563.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/1674404664.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/992465164.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/668291877.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda$38/1584193862.run(Unknown Source)
... 1 more
Caused by: java.lang.IllegalArgumentException: Can not set java.awt.TextField field sample.Controller.login to javafx.scene.control.TextField
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)
at java.lang.reflect.Field.set(Field.java:758)
at javafx.fxml.FXMLLoader.injectFields(FXMLLoader.java:1155)
at javafx.fxml.FXMLLoader.access$1600(FXMLLoader.java:104)
at javafx.fxml.FXMLLoader$ValueElement.processValue(FXMLLoader.java:853)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:747)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2701)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2521)
... 22 more
回答1:
Your problem is in import in Controller class:
import java.awt.*;
Should be:
import javafx.scene.control.TextField;
The programs tries to convert java.awt.TextField to javafx.scene.control.TextField
I assume you'd like to use javafx, not AWT TextField
Note: don't trust the imports which IDE gives you :)
来源：https://stackoverflow.com/questions/31414346/javafx-problems-with-fxml