JavaFx，@ FXML的问题 [英] JavaFx, Problems with @FXML
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问题描述
我是java的新手，所以我得请你帮忙：P。
我正在创建非常简单的程序，但我坚持验证密码和登录textField。我想知道该代码有什么问题，你能帮助我吗？
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?
控制器
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>
错误代码
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
推荐答案
您的问题已导入控制器类：
Your problem is in import in Controller class:
import java.awt.*;
应该是：
import javafx.scene.control.TextField;
程序试图转换 java.awt.TextField 到 javafx.scene.control.TextField
我假设您要使用 javafx ，不是 AWT TextField
I assume you'd like to use javafx, not AWT TextField
注意：不要相信IDE给你的导入：）
Note: don't trust the imports which IDE gives you :)
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