焦点变化后自动计算年龄

你可以帮我看一下如何在从datepicker中选择日期后自动计算年龄，以及何时焦点从datepicker更改为年龄计算的年龄textfiel？

样本表格在这里

Answer 1

FocusListener将提供帮助，例如……

  JXDatePicker dp = new JXDatePicker(); dp.getEditor().addFocusListener(new FocusAdapter() { @Override public void focusLost(FocusEvent e) { // Calculate age Date date = dp.getDate(); } }); 

有关更多详细信息，请参见如何编写焦点侦听器

年龄计算最好使用JodaTime或Java 8的新Time API完成

Java 8

 Date date = // Date from date picker LocalDate ld = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate(); //LocalDate ld = LocalDate.of(1972, Month.MARCH, 8); Period p = Period.between(ld, LocalDate.now()); System.out.println(p.getYears()); System.out.println(p.getMonths()); System.out.println(p.getDays()); 

哪个输出像……

 42 11 18 

乔达时间

 Date date = // Date from date picker LocalDate ld = LocalDate.fromDateFields(date); Period p = Period.fieldDifference(ld, LocalDate.now()); System.out.println(p.getYears()); System.out.println(p.getMonths()); System.out.println(p.getDays());