简单日期类问题求助！

Question

System.out.println("YEAR:" + GregorianCalendar.YEAR);
System.out.println("MONTH:" + GregorianCalendar.MONTH);
System.out.println("DATE:" + GregorianCalendar.DATE);>>> 换成System.out.println("YEAR:" + gc.get(GregorianCalendar.YEAR));
System.out.println("MONTH:" + gc.get(GregorianCalendar.MONTH));
System.out.println("DATE:" + gc.get(GregorianCalendar.DATE));

Answer 1

收到。
但是
System.out.println("YEAR:" + GregorianCalendar.YEAR);
System.out.println("MONTH:" + GregorianCalendar.MONTH);
System.out.println("DATE:" + GregorianCalendar.DATE);
输出的数字又是什么东西呢？