Print Temperature Average so Primitive

import java.io.*;

public class Average {
  public static void main(String args[]) {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    int i = 0;
    double sum = 0.0;
    double num;
    double ave = 0.0;
    String str;
    try {
      while ((str = br.readLine()) != null) {
        num = Double.parseDouble(str);
        i++;
        sum += num;
      }
    }
    catch (Exception e) {
    }
    ave = sum / i;
    System.out.println("平均 = " + ave);
  }
}