What is System, out, println in System.out.println() in Java
Possible Duplicate:
What's the meaning of System.out.println in Java?
I was looking for the answer of what System, out and println are in System.out.println() in the Java. I searched and found a different answer like these:
System is a built-in class present in java.lang package. This class has a final modifier, which means that, it cannot be inherited by other classes. It contains pre-defined methods and fields, which provides facilities like standard input, output, etc.
out is a static final field (ie, variable)in System class which is of the type PrintStream (a built-in class, contains methods to print the different data values). static fields and methods must be accessed by using the class name, so ( System.out ).
out here denotes the reference variable of the type PrintStream class.
println() is a public method in PrintStream class to print the data values. Hence to access a method in PrintStream class, we use out.println() (as non static methods and fields can only be accessed by using the refrence varialble)
In another page i find another contrasting definition as
System.out.print is a standard output function used in java. where System specifies the package name, out specifies the class name and print is a function in that class.
I am confused by these. Could anybody please exactly tell me what they are?
Answer
System is a final class from the java.lang package.
out is a class variable of type PrintStream declared in the System class.
println is a method of the PrintStream class.