readbufferedtest.java

Java程序设计技巧与开发实例附书源代码。

import java.io.*;

public class ReadBufferedTest
{
  public static void main(String args[])
  {
    double sum = 0;
    try
    {
      long start = System.currentTimeMillis();
      FileInputStream fs_in = new FileInputStream("sample.dat");
      BufferedInputStream bfs_in = new BufferedInputStream(fs_in);
      DataInputStream in = new DataInputStream(bfs_in);
      for (int i = 0; i < 100000; i++)
      {
        sum += in.readDouble();
      }
      in.close();
      long stop = System.currentTimeMillis();
      System.out.println("Average: " + (sum / 100000));
      System.out.println("Time passed: " + (stop - start));
    }
    catch (IOException ioe)
    {
      System.out.println(ioe);
    }
  }
}