What's the meaning of System.out.println in Java?

What's System.out.println in Java?

System.out.println is a statement that prints the argument passed, into the System.out which is generally stdout.

1. System is a Class
2. out is a Variable
3. println() is a method

System is a class in the java.lang package . The out is a static member of the System class, and is an instance of java.io.PrintStream . The println is a method of java.io.PrintStream. This method is overloaded to print message to output destination, which is typically a console or file.

the System class belongs to java.lang package

class System {
  public static final PrintStream out;
  //...
}

the Prinstream class belongs to java.io package

class PrintStream{
  public void println();
  //...
}