How System.out.println() works ?

System.out.println()

System class provides :

• Standard I/O and error output streams.
• Access to system properties and environment variables
• Load files and libraries
• An utility method for quickly copying a portion of an array

out is a static field inside System class.

public final static PrintStream out

println() method prints a String and then terminate the line.

void java.io.PrintStream.println(String x)

Initialization

JVM calls the initializeSystemClass() method which initializes out variable.

private static void initializeSystemClass()