BufferedReader br=new BufferedReader (New InputStreamReader (system.in));

new InputStreamReader(System.in);Constructs a InputStreamReader object that is an object ofa bridge of bytes flowing to a character stream,It reads the bytes and decodes them into characters. new BufferedReader(new InputStreamReader(System.in));Constructs a bufferedreader that contains characters that are converted into bytes that are stored in the console input. So BufferedReader br=new BufferedReader(new InputStreamReader(System.in));Unpacking is: InputStream in  = System.in ; InputStreamReader isr = new InputStreamReader(in); BufferedReader br = new BufferedReader(isr);Get content str=br.readLine();Reads the contents of a row from the BufferedReader object

BufferedReader br=new BufferedReader (New InputStreamReader (system.in));