JAVAAPI学习之Calendar类http://blog.csdn.net/myjlvzlp/article/details/8065775(写的很好,清晰易懂)Calendar类set()、add()、roll()方法区别http://www.360doc.com/content/15/0616/16/25883431_478549940.shtmlhttp://blog.csdn.net/csdnbenbenchong/article/details/7010908