What is the different b/w System.out & System.err & System.in

[Dhineshkumar raj]

What is the different b/w
System.out &
System.err &
System.in

Regards
Dhinesh

[Ilja Preuss]

http://java.sun.com/j2se/1.3/docs/api/java/lang/System.html#in

[Raghavan Muthu]

Adding to that, they mean for different purposes as the name indicates.

in - for getting inputs from user
out - for displaying any output to the user
err - for displaying any errors to the user

They can be given the handles of any such capable devices by obtaining the Stream to it. A stream is nothing but the channel which facilitates your flow of data.

By default, the input stream is given with the handle of keyboard through or using which the user can provide any inputs. The output and error streams are given with the handle of the Console (also known as "monitor").

For dealing with the different streams you may have a look at the available streams in java.io package.