Using BufferedReader to read input number from user : BufferedReader « File « Java Tutorial


public class Main {

  public static void main(String[] args) throws Exception {
    BufferedReader reader = new BufferedReader(new InputStreamReader(;
    String input = reader.readLine();

    double number = Double.parseDouble(input);

    System.out.println(input + ":" + Math.sqrt(number));


11.31.2.Create BufferedReader from InputStreamReader
11.31.3.Create BufferedReader from FileReader
11.31.4.Read content of a file
11.31.5.Reading Text from a File
11.31.6.Reads a text file and displays it line by line.
11.31.7.Using BufferedReader to read input number from user
11.31.8.Call the static method PressAnykey to keep to DOS window open.
11.31.9.Create PrintWriter from BufferedWriter
11.31.10.Create BufferedReader from StringReader
11.31.11.Create BufferReader from InputStreamReader
11.31.12.Reversing a File