在我的 DatePicker 上選擇日期后，我看到了這些錯誤：
E:\все jdk\jdk1.8.0_152\bin\java" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.8\bin" -Dfile.encoding=UTF-8 -classpath "E:\все jdk\jdk1.8.0_152\jre\lib\charsets.jar;E:\все jdk\jdk1.8.0_152\jre\lib\deploy.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\access-bridge-64.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\cldrdata.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\dnsns.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\jaccess.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\jfxrt.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\localedata.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\nashorn.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\sunec.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\sunjce_provider.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\sunmscapi.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\sunpkcs11.jar;E:\все jdk\jdk1.8.0_152\jre\lib\ext\zipfs.jar;E:\все jdk\jdk1.8.0_152\jre\lib\javaws.jar;E:\все jdk\jdk1.8.0_152\jre\lib\jce.jar;E:\все jdk\jdk1.8.0_152\jre\lib\jfr.jar;E:\все jdk\jdk1.8.0_152\jre\lib\jfxswt.jar;E:\все jdk\jdk1.8.0_152\jre\lib\jsse.jar;E:\все jdk\jdk1.8.0_152\jre\lib\management-agent.jar;E:\все jdk\jdk1.8.0_152\jre\lib\plugin.jar;E:\все jdk\jdk1.8.0_152\jre\lib\resources.jar;E:\все jdk\jdk1.8.0_152\jre\lib\rt.jar;C:\Users\ogobe\IdeaProjects\YSK_1\out\production\YSK_1;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.8\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain sample.Main
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at com.sun.javafx.scene.control.skin.DatePickerSkin.handleControlPropertyChanged(DatePickerSkin.java:147)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.lambda$registerChangeListener$61(BehaviorSkinBase.java:197)
at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)
at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
at javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:150)
at com.sun.javafx.scene.control.skin.DatePickerContent.selectDayCell(DatePickerContent.java:689)
at com.sun.javafx.scene.control.skin.DatePickerContent.lambda$createDayCells$174(DatePickerContent.java:731)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 60 more
Caused by: java.lang.NullPointerException
at sample.Controller.getDate(Controller.java:72)
... 70 more
number of years: 1
number of months: 0
number of days: 0
Process finished with exit code 0
控制器.java：
package sample;
import java.net.URL;
import java.time.LocalDate;
import java.time.Month;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAccessor;
import java.util.Calendar;
import java.util.Date;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import java.time.Period;
import javax.swing.*;
public class Controller {
@FXML
private ResourceBundle resources;
@FXML
private URL location;
@FXML
private DatePicker date_1;
@FXML
private DatePicker date_2;
@FXML
private Button buttonAdd;
@FXML
private ChoiceBox<?> choiceBox;
@FXML
private TextField lavozm;
@FXML
private Label year;
@FXML
private Label month;
@FXML
private Label yearOfIIN;
@FXML
private Label monthOfXis;
@FXML
private Label dayOfXis;
public void getDate(ActionEvent event) {
LocalDate dt1 = date_1.getValue();
Calendar c = Calendar.getInstance();
c.set(dt1.getYear(), dt1.getMonthValue(), dt1.getDayOfMonth());
Date date1 = c.getTime();
LocalDate dt2 = date_2.getValue();
Calendar c2 = Calendar.getInstance();
c2.set(dt2.getYear(), dt2.getMonthValue(), dt2.getDayOfMonth());
Date date2 = c.getTime();
Period age = Period.between(dt1, dt2);
int years = age.getYears();
int months = age.getMonths();
int days = age.getDays();
System.out.println("number of years: " years);
System.out.println("number of months: " months);
System.out.println("number of days: " days);
}
@FXML
void initialize() {
}
}
主.java：
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("YSK");
primaryStage.setScene(new Scene(root, 800, 550));
primaryStage.setResizable(false);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
示例.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ChoiceBox?>
<?import javafx.scene.control.DatePicker?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Text?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="550.0" prefWidth="829.0" xmlns="javafx/8.0.141" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="68.0" prefWidth="829.0" style="-fx-background-color: #1d90ed;">
<children>
<TextField layoutX="521.0" layoutY="21.0" prefHeight="16.0" prefWidth="269.0" promptText="Ходим исм шарфи" style="-fx-background-color: #EAFAFA;" />
</children>
</AnchorPane>
<DatePicker fx:id="date_1" layoutX="14.0" layoutY="123.0" onAction="#getDate" prefHeight="27.0" prefWidth="149.0" promptText="Боши" />
<DatePicker fx:id="date_2" layoutX="176.0" layoutY="124.0" onAction="#getDate" prefHeight="27.0" prefWidth="149.0" promptText="Якуни" />
<Button fx:id="buttonAdd" layoutX="387.0" layoutY="172.0" minWidth="26.0" mnemonicParsing="false" prefHeight="17.0" prefWidth="56.0" style="-fx-background-color: #1d90ed;" text=" " />
<ChoiceBox fx:id="choiceBox" layoutX="332.0" layoutY="124.0" prefHeight="26.0" prefWidth="48.0" />
<Text layoutX="28.0" layoutY="438.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Календар хисобида:" />
<Text layoutX="65.0" layoutY="467.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Имтиез блан:" />
<TextField fx:id="lavozm" layoutX="395.0" layoutY="124.0" prefHeight="26.0" prefWidth="185.0" promptText="Лавозм" />
<Text layoutX="624.0" layoutY="143.0" strokeType="OUTSIDE" strokeWidth="0.0" text="йил" />
<Text layoutX="750.0" layoutY="144.0" strokeType="OUTSIDE" strokeWidth="0.0" text="кун" />
<Text layoutX="689.0" layoutY="143.0" strokeType="OUTSIDE" strokeWidth="0.0" text="ой" />
<Label fx:id="year" layoutX="587.0" layoutY="126.0" prefHeight="25.0" prefWidth="28.0" />
<Label fx:id="month" layoutX="654.0" layoutY="127.0" prefHeight="25.0" prefWidth="28.0" />
<Label fx:id="month" layoutX="715.0" layoutY="127.0" prefHeight="25.0" prefWidth="28.0" />
<Text layoutX="187.0" layoutY="437.0" strokeType="OUTSIDE" strokeWidth="0.0" text="йил" />
<Text layoutX="313.0" layoutY="438.0" strokeType="OUTSIDE" strokeWidth="0.0" text="кун" />
<Text layoutX="252.0" layoutY="437.0" strokeType="OUTSIDE" strokeWidth="0.0" text="ой" />
<Label fx:id="year" layoutX="150.0" layoutY="420.0" prefHeight="25.0" prefWidth="28.0" />
<Label fx:id="month" layoutX="217.0" layoutY="421.0" prefHeight="25.0" prefWidth="28.0" />
<Label fx:id="month" layoutX="278.0" layoutY="421.0" prefHeight="25.0" prefWidth="28.0" />
<Text layoutX="191.0" layoutY="466.0" strokeType="OUTSIDE" strokeWidth="0.0" text="йил" />
<Text layoutX="317.0" layoutY="467.0" strokeType="OUTSIDE" strokeWidth="0.0" text="кун" />
<Text layoutX="256.0" layoutY="466.0" strokeType="OUTSIDE" strokeWidth="0.0" text="ой" />
<Label fx:id="yearOfIIN" layoutX="154.0" layoutY="449.0" prefHeight="25.0" prefWidth="28.0" />
<Label fx:id="monthOfXis" layoutX="221.0" layoutY="450.0" prefHeight="25.0" prefWidth="28.0" />
<Label fx:id="dayOfXis" layoutX="282.0" layoutY="450.0" prefHeight="25.0" prefWidth="28.0" />
</children>
</AnchorPane>
uj5u.com熱心網友回復：
出了什么問題
dt2 為空，這是有道理的，因為呼叫 getDate 方法作為 fxml 中為 date_1 和 date_2 日期選擇器參考的 onAction 處理程式。
無論您先使用哪一個選擇日期，另一個都將為所選日期提供空值，因為您一次只能選擇一個日期。
如何修復
如果 date_1.getValue() 或 date_2.getValue() 為空，則應將 getDate 方法更改為退出（通過回傳）。
該方法似乎是計算兩個日期之間的時間段（這對空日期沒有意義）。
一旦用戶選擇了兩個日期，呼叫就會通過并且周期將被正確計算。
在 getDate() 的開頭，寫：
if (date_1.getValue() == null || date_2.getValue() == null) {
System.out.println(“Both dates not yet chosen, will not calculate period”);
return;
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/403039.html
標籤：
上一篇：C#-等待具有回傳值的任務