Java standard input and output system.in and System.out

System.in

System.in is an instance object of the InputStream class, and the creation of the object is done by the local (native) method.

 Public Static Final InputStream in

The IO device corresponding to the system.in byte input stream is the keyboard.

System.in is an instance of the InputStream class, and therefore contains the method int read () and int read (byte[]).

Example:

        int A;         byte New byte [n];         = System.in.read ();        System.out.println ("a =" + a);        System.in.read (b);        System.out.println (new String (b));

System.out

System.in is an instance object of the PrintStream class.

 Public Static Final PrintStream out

The system.out corresponding IO device is the console.

System.out is a printstream stream. The System.out generally outputs the data written to it to the console.

Example:

        PrintStream out = System.out;        Out.println ("Hello World");

Java standard input and output system.in and System.out