Create BufferedReader from InputStreamReader and, read console input : BufferedReader « File Input Output « Java

Create BufferedReader from InputStreamReader and, read console input


class Main {
  public static void main(String args[]) throws Exception {
    InputStreamReader isr = new InputStreamReader(;
    BufferedReader br = new BufferedReader(isr);

    while (true) {
      System.out.print("Radius? ");
      String str = br.readLine();
      double radius;
      try {
        radius = Double.valueOf(str).doubleValue();
      } catch (NumberFormatException nfe) {
        System.out.println("Incorrect format!");
      if (radius <= 0) {
        System.out.println("Radius must be positive!");
      System.out.println("radius " + radius);


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