标签：java date swing date-format
我正在进行一个以hh：mm捕获间隔时间的项目.
我有2个名为btnTimeOut&的按钮. btnTime在单击时捕获系统时间.
要求是获得btnTimeOut和amp;之间的间隔. btnTime in hh：mm等12:30 – 10:00 = 02:30(hh：mm).
目前我使用以下代码作为间隔,但它返回为分钟等,12：30-10：00 = 150分钟.
String timeOut = lblTimeOut.getText();
String timeIn = lblTimeIn2.getText();
SimpleDateFormat format = new SimpleDateFormat("hh:mm");
Date d1 = null;
Date d2 = null;
try {
d1 = format.parse(timeOut);
d2 = format.parse(timeIn);
}
catch (Exception e){
e.printStackTrace();
}
long diff = d2.getTime() - d1.getTime();
long diffMinutes = diff / (60 * 1000);
long diffHours = diff / (60 * 60 * 1000);
lblSurface.setText(String.valueOf(diffMinutes));
如何以hh：mm的形式获得持续时间？
我使用了Joda时间并以无效格式返回：“12:19”格式错误为“：19”.
至于触发显示时间的其他按钮.
DateFormat timeFormat = new SimpleDateFormat("hh:mm");
Date date = new Date();
String time = timeFormat.format(date);
lblTimeIn2.setText(time);
Timer timer = new Timer(1000, timerListener);
// to make sure it doesn't wait one second at the start
timer.setInitialDelay(0);
timer.start();
}
我不知道出了什么问题,我是否需要使用joda时间为我的其他标签显示时间？
解决方法:
我个人会使用JodaTime,因为它考虑了天之间的差异(即23：30-02：30之间的差异)和内置的格式化程序
public class TestJodaTime {
public static void main(String[] args) {
DateTime start = new DateTime(2012, 11, 11, 23, 30, 0, 0);
DateTime end = new DateTime(2012, 11, 12, 1, 30, 0, 0);
Interval interval = new Interval(start, end);
Period toPeriod = interval.toPeriod();
PeriodFormatter dateFormat = new PeriodFormatterBuilder()
.printZeroAlways().minimumPrintedDigits(2)
.appendHours().minimumPrintedDigits(2)
.appendSeparator(":")
.appendMinutes().minimumPrintedDigits(2)
.toFormatter();
System.out.println(toPeriod.toString(dateFormat));
}
}
哪个会输出02:00
扩展示例
public class TestJodaTime {
public static void main(String[] args) {
new TestJodaTime();
}
public TestJodaTime() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JodaPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class JodaPane extends JPanel {
private JTextField startHour;
private JTextField startMin;
private JTextField endHour;
private JTextField endMin;
private JButton diffButton;
private JLabel lblDiff;
private JButton markStart;
private JButton markEnd;
private Timer timer;
private JLabel realTime;
public JodaPane() {
markStart = new JButton("Mark");
markEnd = new JButton("Mark");
startHour = new JTextField(2);
startMin = new JTextField(2);
endHour = new JTextField(2);
endMin = new JTextField(2);
diffButton = new JButton("=");
lblDiff = new JLabel("00:00");
realTime = new JLabel("00:00.00");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(new JLabel("From"), gbc);
gbc.gridx++;
add(startHour, gbc);
gbc.gridx++;
add(new JLabel(":"), gbc);
gbc.gridx++;
add(startMin, gbc);
gbc.gridx++;
add(markStart, gbc);
gbc.gridx++;
add(new JLabel(" to "), gbc);
gbc.gridx++;
add(endHour, gbc);
gbc.gridx++;
add(new JLabel(":"), gbc);
gbc.gridx++;
add(endMin, gbc);
gbc.gridx++;
add(markEnd, gbc);
gbc.gridx++;
add(diffButton, gbc);
gbc.gridx++;
add(lblDiff, gbc);
gbc.gridy++;
add(realTime, gbc);
diffButton.addActionListener(new ActionListener() {
public boolean isValid(JTextField field) {
return field.getText() != null && field.getText().length() > 0;
}
@Override
public void actionPerformed(ActionEvent ae) {
if (isValid(startHour) && isValid(startMin)
&& isValid(endHour) && isValid(endMin)) {
int hourStart = Integer.parseInt(startHour.getText());
int minStart = Integer.parseInt(startMin.getText());
int hourEnd = Integer.parseInt(endHour.getText());
int minEnd = Integer.parseInt(endMin.getText());
String prefix = "";
if (hourEnd < hourStart) {
int tmp = hourStart;
hourStart = hourEnd;
hourEnd = tmp;
prefix = "-";
}
System.out.println("Start = " + hourStart + ":" + minStart);
System.out.println("End = " + hourEnd + ":" + minEnd);
DateTime start = new DateTime(0, 1, 1, hourStart, minStart, 0, 0);
DateTime end = new DateTime(0, 1, 1, hourEnd, minEnd, 0, 0);
Interval interval = new Interval(start, end);
Period toPeriod = interval.toPeriod();
PeriodFormatter dateFormat = new PeriodFormatterBuilder()
.printZeroAlways().minimumPrintedDigits(2)
.appendHours().minimumPrintedDigits(2)
.appendSeparator(":")
.appendMinutes().minimumPrintedDigits(2)
.toFormatter();
lblDiff.setText(prefix + dateFormat.print(toPeriod));
}
}
});
markStart.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
Calendar cal = Calendar.getInstance();
startHour.setText(Integer.toString(cal.get(Calendar.HOUR_OF_DAY)));
startMin.setText(Integer.toString(cal.get(Calendar.MINUTE)));
diffButton.doClick();
}
});
markEnd.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
Calendar cal = Calendar.getInstance();
endHour.setText(Integer.toString(cal.get(Calendar.HOUR_OF_DAY)));
endMin.setText(Integer.toString(cal.get(Calendar.MINUTE)));
diffButton.doClick();
}
});
timer = new Timer(500, new ActionListener() {
private SimpleDateFormat sdf = new SimpleDateFormat("HH:mm.ss");
@Override
public void actionPerformed(ActionEvent ae) {
realTime.setText(sdf.format(new Date()));
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
}
}
你的问题有点模糊,所以我做了一个很好的例子.马克,基本上用当前时间自动填充字段.
几乎没有验证;)
标签：java,date,swing,date-format 来源： https://codeday.me/bug/20190928/1825252.html
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