What is System out println in System out println in Java

Question

Possible Duplicate    What  39 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

User · Answer

Whenever you re confused  I would suggest consulting the Javadoc as the first place for your clarification    From the javadoc about System  here s what the doc says   public final class System extends Object  The System class contains several useful class fields and methods  It cannot be instantiated  Among the facilities provided by the System class are standard input  standard output  and error output streams  access to externally defined properties and environment variables  a means of loading files and libraries  and a utility method for quickly copying a portion of an array   Since  JDK1 0   Regarding System out  public static final PrintStream out The  standard  output stream  This stream is already open and ready to accept output data  Typically this stream corresponds to display output or another output destination specified by the host environment or user  For simple stand-alone Java applications  a typical way to write a line of output data is        System out println data

User · Answer

The first answer you posted  System is a built-in class     is pretty spot on   You can add that the System class contains large portions which are native and that is set up by the JVM during startup  like connecting the System out printstream to the native output stream associated with the  standard out   console

User · 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

[java] What is System, out, println in System.out.println() in Java

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