java基础问题

java中的NaN 是以为 0.0/0.0产生的。

 

System.out.println(0.0/0.0);

NaN

 

oracle 连接未打开异常：

  

Struts has detected an unhandled exception: 




Messages:

1.Io 异常: The Network Adapter could not establish the connection
2.Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Io 异常: The Network Adapter could not establish the connection
 


File:

oracle/jdbc/driver/DatabaseError.java



Line number:

111