JDK源码一句注释: c.toArray might (incorrectly) not return Object[] (see 6260652)

Mar 04,2017 in Java read (770)

ArrayList的构造方法中有这样一句注释: public ArrayList(Collection<? extends E> c) { elementData = c.toArray(); size = elementData.length; /...

Hadoop 底层通信(八)

Mar 04,2017 in Hadoop read (767)

IPC和RPC IPC:进程间通信 RPC:remote procedure call,远程过程调用 Socket:套接字编程 Socket:客户端套接字 ServerSocket:服务器端 nio:异步通信 Channel Selector hadoop底层通信,使用Go...

Mar 01,2017 in Java read (789)

使用JDBC时，我们都会很自然得使用下列语句: Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://127.0.0.1/test?useUnicode=true&characte...