#system.err example

Java: System.out Vs System.in Vs System.err classes and methods.

The java.lang.System class, having three static members (in, out and err) that pre-initialize at JVM startup that’s what no need to initialize. These classes also known as Stream classes.

Out of these System.out is most frequent use by programmers to write output on the console.

System Stream Classes

Here is a list of System Stream classes objects:

System.in

System.out

System.err

System.in

Syste…