《Java语言程序设计(基础篇)》(第10版 梁勇 著)第三十六章练习题答案

《

Java

语言程序设计（基础篇）

（第

10

版

梁勇

著）

第三十六章

练习题答案

36.1

import

ation;

import

import

import

import

ea;

import

eld;

import

Pane;

import

import

public

class

Exercise36_01

extends

Application {

private

CalendarPane calendarPane =

new

CalendarPane();

private

TextField tfUnicode =

new

TextField();

private

TextArea taUnicodeCharacters =

new

TextArea();

@

Override

// Override the start method in the Application class

public

void

start(Stage primaryStage) {

HBox hBox =

new

HBox(5);

ldren().addAll(

new

Label(

), tfUnicode);

gnment();

fColumnCount(4);

BorderPane pane =

new

BorderPane();

ter(taUnicodeCharacters);

(hBox);

// Create a scene and place it in the stage

Scene scene =

new

Scene(pane, 400, 300);

le(

);

// Set the stage title

ne(scene);

// Place the scene in the stage

();

// Display the stage

ction(e -> {

int

code = nt(t().toString(), 16);

n(code);

displayUnicode(code);

});

}

private

void

displayUnicode(

int

code) {

t(

null

);

for

(

int

i = 0; i < 20; i++) {

Text(

tring(code) +

);

for

(

int

j = 0; j < 16; j++) {

Text((

char

)code +

);

code++;

}

Text(

);

}

}

/**

* 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);

}

}

36.2

import

rmat;

import

import

import

import

ne;

import

ation;

import

import

import

ox;

import

import

eld;

import

import

import

public

class

Exercise36_02

extends

Application {

private

Locale[] availableLocales = ilableLocales();

private

String[] availableTimeZones = ilableIDs();

private

DateFormat dateFormat = eInstance();

private

DateFormat timeFormat = eInstance();

private

Date date =

new

Date();

private

TextField tfDate =

new

TextField((date));

private

TextField tfTime =

new

TextField((date));

private

ComboBox cboLocale =

new

ComboBox<>();

private

ComboBox cboTimeZone =

new

ComboBox<>();

private

ComboBox cboDateStyle =

new

ComboBox<>();

private

ComboBox cboTimeStyle =

new

ComboBox<>();

private

Locale locale =

private

String timeZone = ault().getID();

private

int

dateStyle =

private

int

timeStyle =

@

Override

// Override the start method in the Application class

public

void

start(Stage primaryStage) {

// Initialize cboLocales with all available locales

setAvailableLocales();

// Initialize cboTimeZones with all available time zones

setAvailableTimeZones();

ms().addAll(

,

,

,

);

ms().addAll(

,

,

,

);

HBox hBox1 =

new

HBox(5);

ldren().addAll(

new

Label(

), tfDate,

new

Label(

), tfTime);

HBox hBox2 =

new

HBox(5);

ldren().addAll(

new

Label(

), cboLocale,

new

Label(

), cboTimeZone);

HBox hBox3 =

new

HBox(5);

ldren().addAll(

new

Label(

), cboDateStyle,

new

Label(

), cboTimeStyle);

gnment();

VBox vBox =

new

VBox(5);

ldren().addAll(hBox1, hBox2, hBox3);

// Create a scene and place it in the stage

Scene scene =

new

Scene(vBox, 400, 200);

le(

);

// Set the stage title

ne(scene);

// Place the scene in the stage

();

// Display the stage

ction(e -> {

locale =

availableLocales[ectionModel() .getSelectedIndex()];

process();

});

ction(e -> {

timeZone =

availableTimeZones[ectionModel().getSelectedInde x()];

process();

});

ction(e -> {

dateStyle = ectionModel().getSelectedIndex();

process();

});

ction(e -> {

timeStyle = ectionModel().getSelectedIndex();

process();

});

}

private

void

process() {

dateFormat = eInstance(dateStyle, locale);

timeFormat = eInstance(timeStyle, locale);

eZone(eZone(timeZone));

eZone(eZone(timeZone));

t((

new

Date()));

t((

new

Date()));

}

private

void

setAvailableLocales() {

for

(

int

i = 0; i < i++)

ms().add(availableLocales[i]

.getDisplayName() +

+ availableLocales[i].toString());

ectionModel().selectFirst();

}

private

void

setAvailableTimeZones() {

// Sort time zones

(availableTimeZones);

for

(

int

i = 0; i < i++) {

ms().add(availableTimeZones[i]);

}

ectionModel().selectFirst();

}

/**

* 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);

}

}

36.3

import

rmat;

import

rmatSymbols;

import

DateFormat;

import

ar;

import

ianCalendar;

import

import

ne;

import

me;

import

ne;

import

ation;

import

Event;

import

andler;

import

import

import

import

Pane;

import

ne;

import

import

import

ignment;

import

import

on;

public

class

Exercise36_03

extends

Application {

@

Override

// Override the start method in the Application class

public

void

start(Stage primaryStage) {

HBox hBox =

new

HBox(5);

ldren().addAll(

new

CalendarPane(),

new

WorldClock());

// Create a scene and place it in the stage

Scene scene =

new

Scene(hBox, 500, 200);

le(

);

// Set the stage title

ne(scene);

// Place the scene in the stage

();

// 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

WorldClock

extends

BorderPane {

private

TimeZone timeZone = eZone(

);

private

Locale locale = ault();

private

ClockPane clock =

new

ClockPane();

// Still clock

private

Label lblDigitTime =

new

Label();

public

WorldClock() {

setCenter(clock);

setBottom(lblDigitTime);

gnment(lblDigitTime, );

EventHandler eventHandler = e -> {

setCurrentTime();

// Set a new clock time

};

// Create an animation for a running clock

Timeline animation =

new

Timeline(

new

KeyFrame((1000), eventHandler));

leCount(NITE);

();

// Start animation

// Resize the clock

widthProperty().addListener(ov -> (getWidth()));

heightProperty().addListener(ov -> (getHeight()));

}

public

void

setTimeZone(TimeZone timeZone) {

this

.timeZone = timeZone;

}

public

void

setLocale(Locale locale) {

this

.locale = locale;

}

private

void

setCurrentTime() {

Calendar calendar =

new

GregorianCalendar(timeZone, locale);

r(());

ute(());

ond(());

// Display digit time on the label

DateFormat

formatter

=

eTimeInstance(,

, locale);

eZone(timeZone);

t((e()));

}

}

class

CalendarPane

extends

BorderPane {

// The header label

private

Label lblHeader =

new

Label();

// Maximum number of labels to display day names and days

private

Label[] lblDay =

new

Label[49];

private

Calendar calendar;

private

int

month;

// The specified month

private

int

year;

// The specified year

private

Locale locale =

public

CalendarPane() {

// Create labels for displaying days

for

(

int

i = 0; i < 49; i++) {

lblDay[i] =

new

Label();

lblDay[i].setTextAlignment();

}

showDayNames();

// Display day names for the locale

GridPane dayPane =

new

GridPane();

gnment();

p(10);

p(10);

for

(

int

i = 0; i < 49; i++) {

(lblDay[i], i % 7, i / 7);

}

// Place header and calendar body in the pane

this

.setTop(lblHeader);

gnment(lblHeader, );

this

.setCenter(dayPane);

// Set current month and year

calendar =

new

GregorianCalendar();

month = ();

year = ();

updateCalendar();

// Show calendar

showHeader();

showDays();

}

/**

* Update the day names based on locale

*/

private

void

showDayNames() {

DateFormatSymbols dfs =

new

DateFormatSymbols(locale);

String dayNames[] = kdays();

// jlblDay[0], jlblDay[1], ..., jlblDay[6] for day names

for

(

int

i = 0; i < 7; i++) {

lblDay[i].setText(dayNames[i + 1]);

}

}

/**

* Update the header based on locale

*/

private

void

showHeader() {

SimpleDateFormat sdf =

new

SimpleDateFormat(

, locale);

String header = (e());

t(header);

}

public

void

showDays() {

// Get the day of the first day in a month

int

startingDayOfMonth = (_OF_WEEK);

// Fill the calendar with the days before this month

Calendar cloneCalendar = (Calendar) ();

(, -1);

// Becomes preceding month

int

daysInPrecedingMonth = ualMaximum(

_OF_MONTH);

for

(

int

i = 0; i < startingDayOfMonth - 1; i++) {

lblDay[i + 7].setTextFill(RAY);

lblDay[i + 7].setText(daysInPrecedingMonth

- startingDayOfMonth + 2 + i +

);

}

// Display days of this month

int

daysInCurrentMonth = ualMaximum(

_OF_MONTH);

for

(

int

i = 1; i <= daysInCurrentMonth; i++) {

lblDay[i - 2 + startingDayOfMonth + 7].setTextFill();

lblDay[i - 2 + startingDayOfMonth + 7].setText(i +

);

}

// Fill the calendar with the days after this month

int

j = 1;

for

(

int

i = daysInCurrentMonth - 1 + startingDayOfMonth + 7;

i < 49; i++) {

lblDay[i].setTextFill(RAY);

lblDay[i].setText(j++ +

);

}

}

/**

* Set the calendar to the first day of the specified month and year

*/

public

void

updateCalendar() {

(, year);

(, month);

(, 1);

}

public

int

getMonth() {

return

month;

}

public

void

setMonth(

int

newMonth) {

month = newMonth;

updateCalendar();

showHeader();

showDays();

}

public

int

getYear() {

return

year;

}

public

void

setYear(

int

newYear) {

year = newYear;

updateCalendar();

showHeader();

showDays();

}

public

void

setLocale(Locale locale) {

this

.locale = locale;

updateCalendar();

showDayNames();

showHeader();

showDays();

}

}

}