13.4 Standard Streams
Java provides following three standard streams
Standard Input:
This is used to feed the data to user’s program and usually a keyboard is used as standard input stream and represented as System.in.
Standard Output:
This is used to output the data produced by the user’s program and usually a computer screen is used to standard output stream and represented as System.out.
Standard Error:
This is used to output the error data produced by the user’s program and usually a computer screen is used to standard error stream and represented as System.err.
Download for more knowledge
https://play.google.com/store/apps/details?id=ab.java.programming
QCOM 