I've deleted the extra copies. Really, Ravindra, you only need to press the "Add New Topic" button once. As for the question... have you taken a look at the API? Specifically, for the System class? Useful stuff.
Originally posted by ravindra patil: tell me how this is done ? by using class name you can call its static method then what is that 'out'
i pressed it only once but when i went out for some time my session was espired so browes showed me 'session expired' press retry or cancle so each time i pressed retry my topic got added thats why yow saw same topic 3 times sorry for that.... :roll:
System class contains 3 static class variables: public static final PrintStream out; public static final PrintStream err; public static final InputStream in
Because out is a reference variable of PrintStream class;the value returned by System.out must either be null or an object of class PrintStream. When JVM starts an application running,it instantiates an object of PrintStream class & connects it to standard output device(Command prompt) When PrintStream object is instantited by JVM,its reference variable is assigned to the "out" class variable of the System class. Thus System.out returns an object of class PrintStream & in class PrintStream there is a method called println() which prints the string on screen. So by System.out.println() ; we are able to print characters on screen.