Compute Time to Process sqrt and Input and Output Operations

package com.darwinsys;
 
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: TimeComputation.java,v 1.1 2008/08/07 12:42:31 cat Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
 
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
 
/**
 * TimeComputation for processing sqrt and Input and Output operations.
 * 
 * @author Ian Darwin, http://www.darwinsys.com/
 * @version $Id: TimeComputation.java,v 1.1 2008/08/07 12:42:31 cat Exp $
 */
public class TimeComputation {
    public static void main(String[] argv) {
	try {
	    new TimeComputation().run();
	} catch (IOException e) {
	    System.err.println(e);
	}
    }
 
    public void run() throws IOException {
 
	DataOutputStream n = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("java2s")));
	long t0, t1;
	System.out.println("Java Starts at " + (t0 = System.currentTimeMillis()));
	double k;
	for (int i = 0; i < 100000; i++) {
	    k = 2.1 * Math.sqrt((double) i);
	    n.writeDouble(k);
	}
	System.out.println("Java Ends at " + (t1 = System.currentTimeMillis()));
	double deltaT = t1 - t0;
	System.out.println("This run took " + DecimalFormat.getInstance().format(deltaT / 1000.) + " seconds.");
    }
 
}