我正在为我的教育第一学期的编程考试创建一个程序。它应该向用户显示在哥本哈根和其他6个城市（在其他时区）的时间。用户还应该能够将城市添加到列表中。我正在用JAVA编写程序（下面提供了源代码）。当我从eclipse运行它时，应用程序运行正常，但是当我将它导出到.jar文件时，某些功能不起作用。以下是程序如何从eclipse运行（以及它应该如何运行）：Screenshots
当我从.jar文件中运行它时，程序将不会提交输入的城市名称（程序停留在屏幕3）。这不是应用程序停止或卡住。我仍然可以编辑文本fild并按“显示时间” - 按钮 - 按“添加城市”按钮没有任何反应（或当焦点位于文本字段时按Enter键也应该将输入的城市添加到列表）。
我使用了JodaTime库中的类（添加到构建路径中）。
我将项目从eclipse导出为“Runnable JAR文件”（我也尝试导出为“JAR文件”但是当我运行它时会出现错误，所以我猜这绝对不是这样做的方法：P）。在选择“Runnable JAR文件”时，我尝试了“库处理”的所有3个选项：
“将所需的库提取到生成的JAR”
“将所需的库打包到生成的JAR中”
“将所需的库复制到生成的JAR旁边的子文件夹中”
结果与前两个相同，在第三种情况下，当我打开.jar时没有任何反应。
我不知道问题的根源是什么。请帮帮我： - ）
我认为这可能与我为另一个项目所做的类Capitalize有关。当我注释掉使用该类的代码时，程序运行正常。我只是不知道它是什么：S
好的，所以我从其他项目中删除了我的班级部分，而是在这个项目中实现了一个新方法来完成这项工作。 DONE！
谢谢大家。
关心Joakim
源代码：
/**
* This class sets up a window with which a user can interact with a GUI to get the current time in
* Copenhagen, London, New York, Helsinki, Beijing, San Francisco, New Delhi and Tokyo. The user can
* also add a new city and its GMT offset to the list where the current time in the new city also
* will be shown.
*
* @author Joakim
* @version 1
*
*/
public class MyTimeZone
{
public static void main(String[] args)
{
@SuppressWarnings("unused")
MyTimeZone timezone = new MyTimeZone();
}
// Timezone stuff
private DateTime time;
private DateTimeZone selectedTimeZone;
// Graphical stuff
private JFrame window;
private JPanel windowpanel;
private JComboBox<GMTHours> gmtHBox;
private JComboBox<GMTMinutes> gmtMBox;
private JTextField input;
private JTextArea output;
private TreeMap<String, DateTime> outputValues;
/**
* Sets up the default window in a JFrame.
*/
private MyTimeZone()
{
window = new JFrame();
windowpanel = new JPanel(new BorderLayout());
setUpPanel();
window.setContentPane(windowpanel);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setMinimumSize(new Dimension(420, 300));
window.setVisible(true);
}
/**
* Sets up the JPanel that will be displayed in a JFrame
*/
private void setUpPanel()
{
JPanel north = new JPanel(new FlowLayout());
JPanel south = new JPanel(new FlowLayout());
windowpanel.add(north, BorderLayout.PAGE_START);
windowpanel.add(south, BorderLayout.PAGE_END);
// "Show Time"-button
JButton showTime = new JButton("Show Time");
showTime.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent event)
{
updateTextArea();
input.setEditable(true);
}
});
north.add(showTime);
// Output text-area
output = new JTextArea();
output.setEditable(false);
outputValues = new TreeMap<String, DateTime>();
setDefaultTexts();
JScrollPane outputTextArea = new JScrollPane(output);
outputTextArea.setBorder(BorderFactory.createLoweredBevelBorder());
windowpanel.add(outputTextArea, BorderLayout.CENTER);
// Input text-field
input = new JTextField();
input.setEditable(false);
input.setPreferredSize(new Dimension(150, 20));
input.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent event)
{
try
{
String inputString = input.getText();
addCity(inputString);
updateTextArea();
input.setText("");
gmtHBox.setSelectedItem(GMTHours.ZERO);
gmtMBox.setSelectedItem(GMTMinutes.ZERO);
}
catch (Exception e)
{
output.setText(e.toString());
}
}
});
south.add(input);
// Drop-down menus
gmtHBox = new JComboBox<GMTHours>();
gmtHBox.setPreferredSize(new Dimension(80, 20));
for (GMTHours gmtH : GMTHours.values())
{
gmtHBox.addItem(gmtH);
}
gmtHBox.setSelectedItem(GMTHours.ZERO);
south.add(gmtHBox);
south.add(new JLabel(":"));
gmtMBox = new JComboBox<GMTMinutes>();
gmtMBox.setPreferredSize(new Dimension(40, 20));
for (GMTMinutes gmtM : GMTMinutes.values())
{
gmtMBox.addItem(gmtM);
}
south.add(gmtMBox);
// "Add City"-button
JButton addCity = new JButton("Add City");
addCity.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent event)
{
try
{
String inputString = input.getText();
addCity(inputString);
updateTextArea();
input.setText("");
gmtHBox.setSelectedItem(GMTHours.ZERO);
gmtMBox.setSelectedItem(GMTMinutes.ZERO);
}
catch (Exception e)
{
output.setText(e.toString());
}
}
});
south.add(addCity);
}
/**
* Updates the output text area. Is called everytime the user adds a city.
*/
private void updateTextArea()
{
output.setText("");
Set<Entry<String, DateTime>> set = outputValues.entrySet();
Iterator<Entry<String, DateTime>> i = set.iterator();
while (i.hasNext())
{
Map.Entry<String, DateTime> me = i.next();
DateTime newTime = new DateTime(me.getValue().getZone());
outputValues.put(me.getKey(), newTime);
output.append(me.getKey() + ": " + getTimeString(newTime));
}
}
/**
* Adds a city (string) and its time to the TreeMap of cities
* that has to be written in the output area.
*
* @param inputString The city (string) to be added
*/
private void addCity(String inputString)
{
Capitalize cap = new Capitalize();
inputString = cap.capitalizeString(inputString); // See documentation for more
// info about class Capitalize
selectedTimeZone = DateTimeZone.forOffsetHoursMinutes(
gmtHBox.getItemAt(gmtHBox.getSelectedIndex()).offset,
gmtMBox.getItemAt(gmtMBox.getSelectedIndex()).offset);
time = new DateTime(selectedTimeZone);
outputValues.put(inputString, time);
}
/**
* This method sets the default values of the output text area (introduction) and
* fills the TreeMap with the default cities and their time
*/
private void setDefaultTexts()
{
output.setText("When you click the button above the current time in Copenhagen is\n"
+ "shown here as well as the time in 6 other cities along with their GMT\n"
+ "time differences shown in parantheses.\n\n"
+ "After you have clicked 'Show Time' you can also submit cities to the\n"
+ "list yourself by typing the name of the city in the text-field beneath and\n"
+ "choosing the GMT offset in [hours]:[minutes] in the dropdown menus.");
time = new DateTime(DateTimeZone.forID("Europe/Copenhagen"));
outputValues.put("Copenhagen", time);
time = new DateTime(DateTimeZone.forID("Europe/London"));
outputValues.put("London", time);
time = new DateTime(DateTimeZone.forID("America/New_York"));
outputValues.put("New York", time);
time = new DateTime(DateTimeZone.forID("Europe/Helsinki"));
outputValues.put("Helsinki", time);
time = new DateTime(DateTimeZone.forID("Asia/Hong_Kong"));
outputValues.put("Beijing", time);
time = new DateTime(DateTimeZone.forID("America/Vancouver"));
outputValues.put("San Francisco", time);
time = new DateTime(DateTimeZone.forID("Asia/Kolkata"));
outputValues.put("New Delhi", time);
time = new DateTime(DateTimeZone.forID("Asia/Tokyo"));
outputValues.put("Tokyo", time);
}
/**
* Converts a DateTime object to a string with the given time and the offset from the given
* timezone to the Greenwich Main Time.
*
* @param time A DateTime object from which you want a string representing the time.
* @return A string of the format: "02:30 (GMT-3:15)" if the time specified in the DateTime
* object is 2:30 and the offset is 3 hours and 15 minutes behind GMT.
*/
private String getTimeString(DateTime time)
{
String completeTimeString = "";
if (time.hourOfDay().get() < 10)
completeTimeString = "0" + time.hourOfDay().get();
else
completeTimeString = "" + time.hourOfDay().get();
completeTimeString += ":";
if (time.minuteOfHour().get() == 0)
completeTimeString += "0" + time.minuteOfHour().get();
else
completeTimeString += "" + time.minuteOfHour().get();
completeTimeString += " (GMT";
DateTime gmt = new DateTime(DateTimeZone.forID("Etc/GMT0"));
int offsetInMinutes = time.getZone().getOffset(gmt.getMillis()) / 60000;
if (offsetInMinutes > 0)
completeTimeString += "+";
completeTimeString += offsetInMinutes / 60;
if (offsetInMinutes % 60 != 0)
{
if (offsetInMinutes < 0)
offsetInMinutes = offsetInMinutes * (-1);
completeTimeString += ":" + offsetInMinutes % 60 + ")\n";
}
else
completeTimeString += ")\n";
return completeTimeString;
}
/**
* An enum for all the GMT hourly offset values
*
* @author Joakim
*
*/
private enum GMTHours
{
MINUS12(-12), MINUS11(-11), MINUS10(-10), MINUS9(-9), MINUS8(-8), MINUS7(-7), MINUS6(-6),
MINUS5(-5), MINUS4(-4), MINUS3(-3), MINUS2(-2), MINUS1(-1), ZERO(0), PLUS1(1),
PLUS2(2), PLUS3(3), PLUS4(4), PLUS5(5), PLUS6(6), PLUS7(7), PLUS8(8), PLUS9(9),
PLUS10(10), PLUS11(11), PLUS12(12);
private int offset;
GMTHours(int offset)
{
this.offset = offset;
}
@Override
public String toString()
{
String s = "GMT";
switch (offset)
{
case -1: s += "-1"; break;
case -2: s += "-2"; break;
case -3: s += "-3"; break;
case -4: s += "-4"; break;
case -5: s += "-5"; break;
case -6: s += "-6"; break;
case -7: s += "-7"; break;
case -8: s += "-8"; break;
case -9: s += "-9"; break;
case -10: s += "-10"; break;
case -11: s += "-11"; break;
case -12: s += "-12"; break;
case 0: s += "0"; break;
case 1: s += "+1"; break;
case 2: s += "+2"; break;
case 3: s += "+3"; break;
case 4: s += "+4"; break;
case 5: s += "+5"; break;
case 6: s += "+6"; break;
case 7: s += "+7"; break;
case 8: s += "+8"; break;
case 9: s += "+9"; break;
case 10: s += "+10"; break;
case 11: s += "+11"; break;
case 12: s += "+12"; break;
}
return s;
}
}
/**
* An enum for all the GMT minutely offset values
*
* @author Joakim
*
*/
private enum GMTMinutes
{
ZERO(0), FIFTEEN(15), THIRTY(30), FORTYFIVE(45);
private int offset;
GMTMinutes(int offset)
{
this.offset = offset;
}
@Override
public String toString()
{
String s = "";
switch (offset)
{
case 0: s = "00"; break;
case 15: s = "15"; break;
case 30: s = "30"; break;
case 45: s = "45"; break;
}
return s;
}
}
}
答案 0 :(得分：2)
您可能会遇到异常，因为带有Jode时间库的Jar文件在运行时不在您的类路径中。而且，您可能没有代码（我没有详细查看您的代码）来捕获您不期望的异常并提供错误报告。因此异常被吞噬了。我建议你在转交作业之前解决这个问题。
另一个建议是使用Eclipse远程调试程序，以便在从命令行运行它时可以准确地看到它的运行情况。 Here对于如何做是一个非常好的描述。
答案 1 :(得分：1)
你必须添加所有需要的Java导入，我想念那里
import java.util.TreeMap;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
etc...
并且您可能会使用DateSpinnerModel查看JSpinner，而不是针对每个JComboBoxes部分实施Date
我无法抗拒你的实现，确定JodaTime是优秀的API，但是JSpinner给了我
import java.awt.GridLayout;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
public class TimeZoneSpinners {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TimeZoneSpinners().makeUI();
}
});
}
public void makeUI() {
final String[] zones = {"Asia/Tokyo", "Asia/Hong_Kong",
"Asia/Calcutta", "Europe/Paris", "Europe/London",
"America/New_York", "America/Los_Angeles"
};
final JLabel[] labels = new JLabel[zones.length];
final SimpleDateFormat[] formats = new SimpleDateFormat[zones.length];
SpinnerDateModel model = new SpinnerDateModel();
Calendar cal = Calendar.getInstance();
Date date = cal.getTime();
model.setValue(date);
JSpinner spinner = new JSpinner(model);
spinner.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
Date date = (Date) ((JSpinner) e.getSource()).getValue();
for (int i = 0; i < labels.length; i++) {
labels[i].setText(formats[i].format(date));
}
}
});
SimpleDateFormat format = ((JSpinner.DateEditor) spinner.getEditor()).getFormat();
format.setTimeZone(TimeZone.getTimeZone(zones[0]));
format.applyPattern("yyyy-MM-dd HH:mm:ss");
JPanel panel = new JPanel(new GridLayout(zones.length, 2, 4, 4));
for (int i = 0; i < zones.length; i++) {
formats[i] = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");
formats[i].setTimeZone(TimeZone.getTimeZone(zones[i]));
JLabel label = new JLabel(zones[i]);
labels[i] = new JLabel("yyyy-MMM-dd HH:mm:ss");
panel.add(label);
panel.add(labels[i]);
}
JFrame frame = new JFrame();
frame.getContentPane().add(spinner, "North");
frame.getContentPane().add(panel, "Center");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
import java.util.TimeZone;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Arrays;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class TZShiftTest {
public static void main(String[] args) throws Exception {
// Assume DST shift happens on a minute boundary,
// that is, when minutes, seconds, and millis are zero.
// 60 min./hr. * 24 hr./day * 265 days/yr * about 250 TZs that use DST = 131,400,000 tests
// to test every minute of every TZ that uses DST for one year
DateFormat df = new SimpleDateFormat("EEE, yyyy-MM-dd HH:mm:ss.SSS zzzz");
String[] ids = TimeZone.getAvailableIDs();
Arrays.sort(ids);
long totalElapsed = 0L;
for (String id : ids) {
long start;
long end;
long elapsed;
int startYear;
TimeZone tz = TimeZone.getTimeZone(id);
if (!tz.useDaylightTime()) {
continue;
}
Calendar cal = new GregorianCalendar();
start = System.nanoTime();
cal.setTimeZone(tz);
cal.set(Calendar.MILLISECOND, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.MONTH, Calendar.JANUARY);
startYear = cal.get(Calendar.YEAR);
df.setTimeZone(tz);
while (cal.get(Calendar.YEAR) == startYear) {
tz.inDaylightTime(cal.getTime());
cal.add(Calendar.MINUTE, 1);
}
end = System.nanoTime();
elapsed = end - start;
totalElapsed += elapsed;
System.out.printf("%s took %,d ms, total is %,d s%n", tz.getDisplayName(), elapsed / 1000000L, totalElapsed / 1000000000L);
}
}
}