Question
How do you delete a Cookie within a JSP? (JSP)
Answer
Cookie mycook = new Cookie("name","value");
response.addCookie(mycook);
Cookie killmycook = new Cookie("mycook","value");
killmycook.setMaxAge(0);
killmycook.setPath("/");
killmycook.addCookie(killmycook);
Question
How many types of protocol implementations does RMI have? (RMI)
Answer
RMI has at least three protocol implementations: Java
Remote Method Protocol(JRMP), Internet Inter ORB Protocol(IIOP),
and Jini Extensible Remote Invocation(JERI). These are alternatives,
not part of the same thing, All three are indeed layer 6 protocols for
those who are still speaking OSI reference model.
Question
What are the different identifier states of a Thread?
(Core Java)
Answer
The different identifiers of a Thread are:
R - Running or runnable thread
S - Suspended thread
CW - Thread waiting on a condition variable
MW - Thread waiting on a monitor lock
MS - Thread suspended waiting on a monitor lock
Question
What is the fastest type of JDBC driver? (JDBC)
Answer
JDBC driver performance will depend on a number of
issues:
(a) the quality of the driver code,
(b) the size of the driver code,
(c) the database server and its load,
(d) network topology,
(e) the number of times your request is translated to a different API.
In general, all things being equal, you can assume that the more your
request and response change hands, the slower it will be. This
means that Type 1 and Type 3 drivers will be slower than Type 2
drivers (the database calls are make at least three translations versus
two), and Type 4 drivers are the fastest (only one translation).
Question
Request parameter How to find whether a parameter
exists in the request object?
(Servlets)
Answer
1.boolean hasFoo = !(request.getParameter("foo") ==
null || request.getParameter("foo").equals(""));
2. boolean hasParameter =
request.getParameterMap().contains(theParameter);
(which works in Servlet 2.3+)
Question
How can I send user authentication information while
makingURLConnection?
(Servlets)
Answer
You’ll want to use
HttpURLConnection.setRequestProperty and set all the appropriate
headers to HTTP authorization.
Question
How do I convert a numeric IP address like 192.18.97.39
into a hostname like java.sun.com?
(Networking)
Answer
Question
How many methods do u implement if implement the
Serializable Interface?
(Core Java)
Answer
The Serializable interface is just a "marker" interface,
with no methods of its own to implement. Other ’marker’ interfaces
are
java.rmi.Remote
java.util.EventListener
String hostname =InetAddress.getByName("192.18.97.39").getHostName();
posted on 2010-10-25 17:08
Sun River 閱讀(293)
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