利用JavaFX制作一個簡單的時鐘

package com.company;

import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.text.Text;
import java.util.Calendar;
import java.util.GregorianCalendar;

public class ClockPane extends Pane{
 private int hour;
 private int minute;
 private int second;
 private double w=250,h=250;

 public ClockPane() {
  setCurrentTime();
 }

 public ClockPane(int hour,int minute,int second) {
  this.hour=hour;
  this.minute=minute;
  this.second=second;
  paintClock();
 }

 public int getHour() {
  return hour;
 }

 public void setHour(int hour) {
  this.hour=hour;
  paintClock();
 }

 public int getMinute() {
  return minute;
 }

 public void setMinute(int minute) {
  this.minute=minute;
  paintClock();
 }

 public int getSecond() {
  return second;
 }

 public void setSecond(int second) {
  this.second=second;
  paintClock();
 }

 public double getW() {
  return w;
 }

 public void setW(double w) {
  this.w=w;
  paintClock();
 }

 public double getH() {
  return h;
 }

 public void setH(double h) {
  this.h=h;
  paintClock();
 }

 public void setCurrentTime() {
  Calendar calendar=new GregorianCalendar();
  this.hour=calendar.get(Calendar.HOUR_OF_DAY);
  this.minute=calendar.get(Calendar.MINUTE);
  this.second=calendar.get(Calendar.SECOND);
  paintClock();
 }

 protected void paintClock() {
  double clockRadius=Math.min(w,h)*0.8*0.5;
  double centerX=w/2;
  double centerY=h/2;

  Circle circle=new Circle(centerX,centerY,clockRadius);
  circle.setFill(Color.WHITE);
  circle.setStroke(Color.BLACK);

  Text t1=new Text(centerX-5,centerY-clockRadius+12,"12");
  Text t2=new Text(centerX-clockRadius+3,centerY+5,"9");
  Text t3=new Text(centerX+clockRadius-10,centerY+3,"3");
  Text t4=new Text(centerX-3,centerY+clockRadius-3,"6");

  double sLength=clockRadius*0.8;
  double scondX=centerX+sLength*Math.sin(second*(2*Math.PI/60));
  double scondY=centerY-sLength*Math.cos(second*(2*Math.PI/60));
  Line sline=new Line(centerX,centerY,scondX,scondY);
  sline.setStroke(Color.RED);

  double mLength=clockRadius*0.65;
  double minuteX=centerX+mLength*Math.sin(minute*(2*Math.PI/60));
  double minuteY=centerY-mLength*Math.cos(minute*(2*Math.PI)/60);
  Line mline=new Line(centerX,centerY,minuteX,minuteY);
  mline.setStroke(Color.BLUE);

  double hLength=clockRadius*0.5;
  double hourX=centerX+hLength*Math.sin((hour%12+minute/60.0)*(2*Math.PI/12));
  double hourY=centerY-hLength*Math.cos((hour%12+minute/60)*(2*Math.PI/12));
  Line hline=new Line(centerX,centerY,hourX,hourY);
  hline.setStroke(Color.GREEN);

  getChildren().clear();
  getChildren().addAll(circle,t1,t2,t3,t4,sline,mline,hline);

 }
}

package com.company;

import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Duration;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.animation.KeyFrame;
import javafx.scene.control.Label;

public class ClockAnimation extends Application {
 @Override
 public void start(Stage primaryStage) {
  ClockPane clock=new ClockPane();
  BorderPane borderPane=new BorderPane();

  EventHandler<ActionEvent> eventHandler=e -> {
   clock.setCurrentTime();
   String timeString=clock.getHour()+":"+clock.getMinute()+":"+clock.getSecond();
   Label lblCurrentTime=new Label(timeString);
   borderPane.setCenter(clock);
   borderPane.setBottom(lblCurrentTime);
   BorderPane.setAlignment(lblCurrentTime, Pos.TOP_CENTER);
  };

  Timeline animation=new Timeline(new KeyFrame(Duration.millis(1000),eventHandler));
  animation.setCycleCount(Timeline.INDEFINITE);
  animation.play();

  Scene scene=new Scene(borderPane,250,250);
  primaryStage.setTitle("ClockAnimation");
  primaryStage.setScene(scene);
  primaryStage.show();

  borderPane.widthProperty().addListener(ov ->
   clock.setW(borderPane.getWidth())
  );

  borderPane.heightProperty().addListener(ov ->
   clock.setH(borderPane.getHeight())
  );
 }
}