readunbufferedtest.java

Java课堂练习

/**
 * @(#)ReadUnbufferedTest.java
 *
 *
 * @author 
 * @version 1.00 2007/11/16
 */
import java.io.*;

public class ReadUnbufferedTest {
        
    /**
     * Creates a new instance of <code>ReadUnbufferedTest</code>.
     */
    public ReadUnbufferedTest() {
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
    double sum=0;
    try {
    long start=System.currentTimeMillis();
    FileInputStream  fs_in=new FileInputStream("4.txt");
    DataInputStream in=new DataInputStream(fs_in);
    for (int i=0; i<100000; i++) 
    { double d=in.readDouble();
      System.out.println(d);
      sum+=d;
    }      
    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);
    }
    }
}