System class - Basic Concept  in  java, Java programmers must know it


explain System.out.println();

System is a final  class in java , we are using class name to access out (which is a reference variable of PrintStream class) that means out is a static member of System class.
so System.out returns us the PrintStream object so following line of code looks different but it is valid is valid
PrintStream p1 = System.out;

println(char[] a) is a non static method inside PrintStream class whose job is to print the passed data.

by default PrintStream object points to console , so System.out.println("data");  prints data on the console.

 System.out.println("data");  is same as p1.println("data");  


Check your knowledge now

main(){
PrintStream p1 = new PrintStream("stdout.log");
p1.println("hello");
System.out.println("world");
}

Based on the above knowledge what will be the output ?