randomreadtest.java

Java程序设计技巧与开发实例附书源代码。

import java.io.*;

public class RandomReadTest
{
  public static void main(String args[])
  {
    try
    {
      FileInputStream fs_in = new FileInputStream("sample.dat");
      DataInputStream in = new DataInputStream(fs_in);
      double sum = 0.0;
      int count = 0;
      try
      {
        while (true)
        {
          sum += in.readDouble();
          count++;
        }
      }
      catch (EOFException eofe)
      {
        System.out.println("Counted: " + count);
        System.out.println("Average: " + (sum / count));
      }
      in.close();
    }
    catch (FileNotFoundException fe)
    {
      System.err.println(fe);
    }
    catch (IOException ioe)
    {
      System.out.println(ioe);
    }
  }
}