关于GregorianCalendar类
System.out.println(GregorianCalendar.DAY_OF_MONTH);//输出怎么是5
API上说是 1 啊

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java.util.Calendar
public static final int AM 0
public static final int AM_PM 9
public static final int APRIL 3
public static final int AUGUST 7
public static final int DATE 5
public static final int DAY_OF_MONTH 5
public static final int DAY_OF_WEEK 7
public static final int DAY_OF_WEEK_IN_MONTH 8
public static final int DAY_OF_YEAR 6
public static final int DECEMBER 11
 上面是API
看看等于几吧。。呵呵。
正确用法是System.out.println(now.get(now.DAY_OF_MONTH));
等价于System.out.println(now.get(GregorianCalendar.DAY_OF_MONTH));

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我看过api之后的理解是跟楼主一样的！
DAY_OF_MONTH
public static final int DAY_OF_MONTHField number for get and set indicating the day of the month. This is a synonym for DATE. The first day of the month has value 1.
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你输出它干吗？
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API1.4
就和PI一样，就一常量。
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神啊，图太多大了。。
直接输出没有意思，
用get来使用他。