Sze Kong Chan

I notice that in the introductory text and examples of web service, the ip address and port of the endpoint is capture within the wsdl, during the wsdl import. My question is how can I make my web service client independent on the ip address of the endpoint. I am hoping to connect to the esb proxy instead. Is UDDI a viable approach? Will appreciate any advises or recommendation on any reference or tutorial. Thanks in advance.

Mathew Lee wrote:
sb2=null,
does it null sb2 object reference on stack or Manchester String Buffer object on heap.

it set the value of the sb2 reference to null, Manchester StringBuffer is still on the heap.

Mathew Lee wrote:
when sb2=null does that means sb=null automatically?

no.

abalfazl, I share the same understanding as you. This is what I think the original codes is doing.

That is because you have change the MyThread.run to wait on each thread objects themselves. After which, nothing is going the notify them to wake up :0)..

In the original implementation, all of the MyThread instances are waiting on the same lock object, and the main thread will wake all of them up to print the "after wait" statement.

The only thread that uses ock.notifyAll (); is main thread who sleeps for 3000.Why synchronized is used here?
synchronized (lock) {
lock.notifyAll ();
}

Although, only the main thread call lock.notifyAll(), but all 4 threads (including main) uses the lock object. Whenever any thread access a shared object, it is only safe to synchronized them. Because we don't know what the method do to the attributes within the shared object

Hope this help.

Mezan,

Not to be too stressful. You will realize that at this point of time, you are not just learning about the programming language itself, but the ability to handle stress, the ability to pick up knowledge by yourself and also learn to be patient and persistence. All this are the characteristics of a good programmer.

Good luck and enjoy the process.

Mathew Lee wrote:>>>when sb2 points to Mancheser stringbuffer object then sb disconnected from Mancheser stringbuffer object

why does sb disconnected from Mancheser stringbuffer object. i was not clear on that. please advise

So basically, 2 objects are created Manchester StringBuffer and Chester Stringbuffer.
At the end of line 10, sb and sb2 reference Manchester, while sb3 reference Chester.
After the execution of (line 11) sb=sb3, => sb2 reference Manchester, while sb and sb3 reference Chester. Note Manchester doesn't qualify for GC because sb2 is still referencing the object
Only after the execution of (line 13) sb2 = null, => Manchester is not reference, hence it is qualify for GC.

I am looking at the problem from the perspective of when the object is not reference, I feel that it will be easier.

what is difference between null and empty.

String s = null; // this is null String t = ""; // this is empty int len1 = s.length(); // null pointer exception will be throw int len2 = t.length(); // len2 will be assigned a value of 0

instead of String can i keep object there instead

No!

String myString = new Object(); // cannot compile Object myObject = new String(); // ok, but until you cast myObject to a String object, you cannot execute the String methods

I agree with Janeice. The best way to learn is to get a book, download a good IDE (netbean, etc) and hack up the codes to try. a good IDE will flag up any compilation error immediately. It better to learn how to fish, I believe that the spirit the guru are trying to cultivate here

Josh,

See if this help.. :0)

Implementation goes something like that
public class LogUtil { private static int MAXENTRY=1024; public void addEntry(Integer newEntry) throws SimulationException { if (newEntry.intValue() > MAXENTRY) // don't worry about creation of newEntry, as it is pass over from where it is invoke throw new SimulationException(); // note that we create the exception object here // TODO: implement your logging logic here } }

To invoke the method
LogUtil util = new LogUtil(); Integer entry = new Integer(256); ... util.addEntry(entry);

Not sure if I get what you want. otherwise, please elaborate.. BTW don't forget to define a class for your SimulationException