Java基础

1、序列化 Volatile transient http://www.blogjava.net/fhtdy2004/archive/2009/06/20/286112.html 2、Math API http://hunter090730.iteye.com/blog/485770 public static void main(String args[]) { System.out.println(“result:”+11+1); System.out.println(“result:”+”12345”.valueOf(54321)); double d = -4.4999999; System.out.println(Math.ceil(d));//不小于参数的最小整数值. System.out.println(Math.floor(d));//不大于参数的最大整数值. System.out.println(Math.round(d));//四舍五入法最接近参数的int/long值. } 输出为: result:111 result:54321 -4.0 -5.0 -4 3、Android的Message,MessageQueue,Looper,Handler详解+实例 http://blog.csdn.net/zhangren07/article/details/6400845 4、HashTable ,HashMap 5、Android 主要组件Activity, Service, ContextProvider, BroadcastReceiver 6、android:screenOrientation