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I have external device connected to the computer. I'm using rxtx library to interface that device. that device transmits a byte immediately as replay to that bye that i send.

example
if i send...

whatever you think. or give me an example if you can.

you see I'm just a student and I have no idea of applications of java. and even my teachers didn't have any experience of programming they teach us just reading books. the only source to me is...

Thank you very much!
your correct developing in java is better thane using VB.net since both performance is almost same but java is platform independent.

how many of the projects in your...

I I see and use many softwares and operating systems in my computer and all around. those are developed in C or C++ and some of them are in
VB.net etc. I codunt find any importance of Java. but we...

what are those where should I look those?

I'm using eclipse IDE on Ubuntu Linux.
I need to profile Java programs with following metrics

execution time
System time
User time
memory usage
page faults
context switches

I started writing a physics engine in Java. I need to write the code in flexible manner.
I currently used one graphic object "rectangle" i need to any number of such objects flexibility.

I need...

Is interface shape can used as a data-type?
and where as a circle can not be use as a data type when since it is not implemented shape?

public class Main {



public static void main(String[] args) {

shape circleshape=new circle();

circleshape.Draw();
}

I am 5 years experienced in programming in C but Till I cant understand the languages like Java.
what is the use of using interfaces and abstract class since they do nothing.

I'm asking what I have understand is right or wrong?

you answered in #2 that what I understood is sleep is a static method hence it invoked with out actually creating an object reference variable. right?

yes because I'm very new to java.

Yea since sleep is a static method?

To create threading there is an object

Thread.sleep();

Is Thread is an object ? sleep is a method? I never created a object called Thread then how can it exists.