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






  1. Java
  2. File Input Output
  3. BufferedReader

Create BufferedReader from InputStreamReader and System.in, read console input

   
import java.io.BufferedReader;
import java.io.InputStreamReader;

class Main {
  public static void main(String args[]) throws Exception {
    InputStreamReader isr = new InputStreamReader(System.in);
    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!");
        continue;
      }
      if (radius <= 0) {
        System.out.println("Radius must be positive!");
        continue;
      }
      System.out.println("radius " + radius);
      return;
    }
  }
}








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