java可执行文件。jar缺少功能
我正在为我第一学期的编程考试创建一个程序。它应该向用户显示哥本哈根和其他6个城市(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运行应用程序时,它运行良好,但当我将其导出到。jar文件有些功能不起作用。下面是程序如何从eclipse运行(以及应该如何运行):Screenshots
当我在电脑上运行时。jar文件程序不会提交输入的cityname(程序停留在屏幕3)。并不是应用程序停止或卡住。我仍然可以编辑文本文件并按下“显示时间”按钮——按下“添加城市”按钮(或者当焦点位于文本字段中时按下Enter键,也应该将输入的城市添加到列表中)没有反应
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“可运行的JAR文件”(我也尝试将其导出为“JAR文件”,但在运行它时会出现错误,所以我想这肯定不是实现的方法:p)。在选择“Runnable JAR file”时,我尝试了“库处理”的所有3个选项,它们是:
“将所需库提取到生成的JAR中”
“将所需库打包到生成的JAR中”
“将所需库复制到生成的JAR旁边的子文件夹中”
在第三种情况下,当我打开。什么都没发生
我不知道问题的根源是什么。请帮帮我:-)
更新
我想这可能是因为我为另一个项目做的课程资本化。当我注释掉使用该类的代码时,程序运行良好。我只是不明白它是什么:S
好吧,我从另一个项目中删除了我的类中的部分,取而代之,我在这个项目中实现了一个新方法来完成这项工作。完成
谢谢大家
问候约金
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;
}
}
}
# 1 楼答案
你必须添加所有需要的Java导入,我错过了
也许你应该用
DateSpinnerModel
来研究JSpinner,而不是为每个Date
部分实现JComboBoxes
我无法抗拒你的建议,当然JodaTime是优秀的API,但是JSpinner给了我
来自Java时区