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what is out in System.out.println()

ravindra patil
Ranch Hand

Joined: Sep 01, 2006
Posts: 230
tell me how this is done ? by using class name you can call its static method then what is that 'out'
Bauke Scholtz
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Joined: Oct 08, 2006
Posts: 2458
Why are you posting 3 threads with the same question .. ?
http://www.coderanch.com/t/278232/Streams/java/Creating-InputStream-String
http://www.coderanch.com/t/278233/Streams/java/Reading-files-size-MB


Anyway, the out is just a static reference variable containing a PrintStream.
Jim Yingst
Wanderer
Sheriff

Joined: Jan 30, 2000
Posts: 18671
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.


"I'm not back." - Bill Harding, Twister
ravindra patil
Ranch Hand

Joined: Sep 01, 2006
Posts: 230
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:
venkatesh pendharkar
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Joined: Apr 29, 2006
Posts: 106
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.
 
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