java 如何在 JDateChooser 中设置 JCalendar 日期
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How to set JCalendar date in JDateChooser
提问by mfrancisp
I have a JDateChooser that is used for selecting birth dates. It starts out as null date value and let's the user choose the birth date either using the textfield or the jdatechooser button which opens the Jcalendar.
我有一个用于选择出生日期的 JDateChooser。它以空日期值开始，让用户使用文本字段或打开 Jcalendar 的 jdatechooser 按钮选择出生日期。
What I'm trying to do is to set the JCalendar's date to -10 years from the current date. By default, the JCalendar is setting the date at the current year. I tried this code but it doesn't work -- it still sets the date to the current date. Any help will do. Thanks!
我想要做的是将 JCalendar 的日期设置为当前日期的 -10 年。默认情况下，JCalendar 将日期设置为当前年份。我试过这段代码，但它不起作用——它仍然将日期设置为当前日期。任何帮助都可以。谢谢！
dcBirthDateNew = new JDateChooser();
dcBirthDateNew.setDateFormatString("MM/dd/yyyy");
dcBirthDateNew.getDateEditor().getUiComponent().addFocusListener(new FocusAdapter() {
@Override
public void focusGained(FocusEvent evt) {
if (evt.getSource() instanceof JTextComponent) {
final JTextComponent textComponent=((JTextComponent)evt.getSource());
SwingUtilities.invokeLater(new Runnable(){
public void run() {
textComponent.selectAll();
}});
}
}
});
JCalendar calx = dcBirthDateNew.getJCalendar();
calx.setCalendar(getPrevDate());
private static Calendar getPrevDate() {
DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
Date myDate = new Date(System.currentTimeMillis());
System.out.println("result is "+ dateFormat.format(myDate));
Calendar cal = Calendar.getInstance();
cal.setTime(myDate);
cal.add(Calendar.YEAR, -10);
System.out.println(dateFormat.format(cal.getTime()));
return cal;
}
回答by trashgod
This seems to work correctly.
这似乎工作正常。
Calendar c = Calendar.getInstance();
c.add(Calendar.YEAR, -10);
JDateChooser chooser = new JDateChooser(c.getTime());
this.add(chooser);
Addendum: The popup editor's date defaults to the value in the JDateChooser; if you set it explicitly, it will become the default value:
附录：弹出编辑器的日期默认为JDateChooser; 中的值。如果您明确设置它，它将成为默认值：
JDateChooser chooser = new JDateChooser();
chooser.getDateEditor().setDate(c.getTime());
You can update another, empty text field in a PropertyChangeListener, as shown here; the property name is "date".
您可以在更新另一个空文本字段PropertyChangeListener，如在这里; 属性名称是"date".
Addendum: Looking closer, the JDateChooserimplementation of ActionListenerhandles the default date described above. You can override it, replacing the lines shown below, to create a different default.
附录：仔细观察，JDateChooser实现ActionListener处理上述默认日期。您可以覆盖它，替换下面显示的行，以创建不同的默认值。
JDateChooser chooser = new MyDateChooser();
this.add(chooser);
…
private static class MyDateChooser extends JDateChooser {
@Override
public void actionPerformed(ActionEvent e) {
…
Date date = dateEditor.getDate();
if (date == null) {
Calendar c = Calendar.getInstance();
c.add(Calendar.YEAR, -10);
calendar.setTime(c.getTime());
} else {
calendar.setTime(date);
}
jcalendar.setCalendar(calendar);
…
}
}
回答by Cristian Marian
Maybe there is another way of doing this, but this is what I have:
也许还有另一种方法可以做到这一点，但这就是我所拥有的：
Date date = new Date();
Calendar calendar = Calendar.getInstance();
int subtractYearValue = 10;
int currentYear = Calendar.getInstance().get(Calendar.YEAR);
int currentMonth = Calendar.getInstance().get(Calendar.MONTH);
int currentDate= Calendar.getInstance().get(Calendar.DATE);
calendar.set(currentYear - subtractYearValue , currentMonth , currentDate);
date.setTime(calendar.getTimeInMillis());
dateChooser.setDate(date);
