java - java.util.calendar 中错误的默认字段值

Question

我正在创建 java.util.Calendar 类的实例:

Calendar rightNow = Calendar.getInstance();

getInstance() 使用默认时区和语言环境获取一个 Calendar...现在是波兰的 20:22 1.11.2012，但是当我打印 rightNow字段出来，结果是错误的:

System.out.print(rightNow.get(Calendar.MONTH));
result: 10.

System.out.print(rightNow.get(Calendar.DAY_OF_MONTH));
result: 1.

System.out.print(rightNow.get(Calendar.DATE));
result: 1.

我假设在 12 月 YEAR 字段也将是错误的。谁能给我解释一下？

Answer 1

当你使用日历而不是从 1 时，月份从 0 开始

根据 javadoc

Field number for get and set indicating the month. This is a calendar-specific value. The first month of the year in the Gregorian and Julian calendars is JANUARY which is 0; the last depends on the number of months in a year.