IO Management: BufferedReader Class

IO Management includes BufferedReader, InputStreamReader, FileInputStream, FileOutputStream, PrintWriter and many important classes.

In this blog, we will work on package, BufferedReader, InputStreamReader classes and readLine() method.

IO Management Example




                readLine() – method -> Return String value


class io1


                public static void main(String args[]) throws IOException


                                // Find the area of circle using readLine() method

                                double PI = 3.14;

                                int r;


                                double area;


                                InputStreamReader obj = new InputStreamReader(;

                                BufferedReader br = new BufferedReader(obj);

                                //BufferedReader br = new BufferedReader(new InputStreamReader(;


                                System.out.print(“Enter R : “);

                                r =  Integer.parseInt(br.readLine());

                                // r = int

                                // br.readLine() – wrapper class String

                                // String class to int data type


                                area = PI * r * r;

                                System.out.println(“Area of Circle = ” + area);   




Enter R : 10

Area of Circle = 314.0


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