import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.Circle;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Exercise14_28 extends Application {
@Override
// Override the start method in the Application class
public void start(Stage primaryStage) {
// Create a clock and a label
ClockPaneWithBooleanProperties clock =
new ClockPaneWithBooleanProperties((int)(Math.random() * 12), (int)(Math.random() * 30), 0);
clock.setSecondHandVisible(false);
String timeString = clock.getHour() + ":" + clock.getMinute()
+ ":" + clock.getSecond();
Label lblCurrentTime = new Label(timeString);
// Place clock and label in border pane
BorderPane pane = new BorderPane();
pane.setCenter(clock);
pane.setBottom(lblCurrentTime);
BorderPane.setAlignment(lblCurrentTime, Pos.TOP_CENTER);
// Create a scene and place it in the stage
Scene scene = new Scene(pane, 250, 250);
primaryStage.setTitle("Exercise14_28"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
}
/**
* The main method is only needed for the IDE with limited
* JavaFX support. Not needed for running from the command line.
*/
public static void main(String[] args) {
launch(args);
}
}
class ClockPaneWithBooleanProperties extends Pane {
private int hour;
private int minute;
private int second;
private boolean hourHandVisible = true;
private boolean minuteHandVisible = true;
private boolean secondHandVisible = true;
public boolean isHourHandVisible() {
return hourHandVisible;
}
public void setHourHandVisible(boolean hourHandVisible) {
this.hourHandVisible = hourHandVisible;
paintClock();
}
public boolean isMinuteHandVisible() {
return minuteHandVisible;
}
public void setMinuteHandVisible(boolean minuteHandVisible) {
this.minuteHandVisible = minuteHandVisible;
paintClock();
}
public boolean isSecondHandVisible() {
return secondHandVisible;
}
public void setSecondHandVisible(boolean secondHandVisible) {
this.secondHandVisible = secondHandVisible;
paintClock();
}
// Clock pane's width and height
private double w = 250, h = 250;
/** Construct a default clock with the current time*/
public ClockPaneWithBooleanProperties() {
setCurrentTime();
}
/** Construct a clock with specified hour, minute, and second */
public ClockPaneWithBooleanProperties(int hour, int minute, int second) {
this.hour = hour;
this.minute = minute;
this.second = second;
paintClock();
}
/** Return hour */
public int getHour() {
return hour;
}
/** Set a new hour */
public void setHour(int hour) {
this.hour = hour;
paintClock();
}
/** Return minute */
public int getMinute() {
return minute;
}
/** Set a new minute */
public void setMinute(int minute) {
this.minute = minute;
paintClock();
}
/** Return second */
public int getSecond() {
return second;
}
/** Set a new second */
public void setSecond(int second) {
this.second = second;
paintClock();
}
/** Return clock pane's width */
public double getW() {
return w;
}
/** Set clock pane's width */
public void setW(double w) {
this.w = w;
paintClock();
}
/** Return clock pane's height */
public double getH() {
return h;
}
/** Set clock pane's height */
public void setH(double h) {
this.h = h;
paintClock();
}
/* Set the current time for the clock */
public void setCurrentTime() {
// Construct a calendar for the current date and time
Calendar calendar = new GregorianCalendar();
// Set current hour, minute and second
this.hour = calendar.get(Calendar.HOUR_OF_DAY);
this.minute = calendar.get(Calendar.MINUTE);
this.second = calendar.get(Calendar.SECOND);
paintClock(); // Repaint the clock
}
/** Paint the clock */
private void paintClock() {
// Initialize clock parameters
double clockRadius = Math.min(w, h) * 0.8 * 0.5;
double centerX = w / 2;
double centerY = h / 2;
// Draw circle
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");
// Draw second hand
double sLength = clockRadius * 0.8;
double secondX = centerX + sLength *
Math.sin(second * (2 * Math.PI / 60));
double secondY = centerY - sLength *
Math.cos(second * (2 * Math.PI / 60));
Line sLine = new Line(centerX, centerY, secondX, secondY);
sLine.setStroke(Color.RED);
// Draw minute hand
double mLength = clockRadius * 0.65;
double xMinute = 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, xMinute, minuteY);
mLine.setStroke(Color.BLUE);
// Draw hour hand
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 / 60.0) * (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);
if (secondHandVisible) {
getChildren().add(sLine);
}
if (minuteHandVisible) {
getChildren().add(mLine);
}
if (hourHandVisible) {
getChildren().add(hLine);
}
}
}
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Java语言程序设计与数据结构(基础篇)第14章课后习题代码chapter14.rar
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java:41个
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2019-07-04
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Java语言程序设计与数据结构(基础篇)第14章课后习题代码
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chapter14.rar (41个子文件)
chapter14
Exercise14_26.java 1KB
Exercise14_09Extra.java 3KB
Exercise14_16.java 2KB
Exercise14_05.java 1KB
Exercise14_25.java 2KB
Exercise14_21.java 2KB
Exercise14_04.java 1KB
Exercise14_05Extra.java 2KB
Exercise14_03Extra.java 2KB
Exercise14_15.java 2KB
Exercise14_18.java 2KB
Exercise14_11Extra.java 2KB
Exercise14_06Extra.java 3KB
Exercise14_04Extra.java 3KB
Exercise14_20.java 2KB
Exercise14_24.java 2KB
Exercise14_01.java 1KB
Exercise14_03.java 2KB
Exercise14_08Extra.java 2KB
Exercise14_02Extra.java 2KB
Exercise14_02.java 1KB
Exercise14_28.java 6KB
Exercise14_09.java 2KB
Exercise14_19.java 2KB
Exercise14_13.java 2KB
Exercise14_07Extra.java 4KB
Exercise14_12Extra.java 2KB
Exercise14_10Extra.java 3KB
Exercise14_14.java 2KB
Exercise14_01Extra.java 3KB
Exercise14_29.java 3KB
Exercise14_22.java 2KB
Exercise14_07.java 1KB
Exercise14_12.java 2KB
Exercise14_11.java 2KB
Exercise14_08.java 1KB
Exercise14_23.java 3KB
Exercise14_17.java 2KB
Exercise14_10.java 1KB
Exercise14_27.java 6KB
Exercise14_06.java 1KB
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