fpadder.java

java tutorial.sun公司官方出品。java入门书籍。最新版

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 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
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 *
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 *     notice, this list of conditions and the following disclaimer.
 *
 *   - 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.
 *
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */ 

//1.1 and later

import java.text.DecimalFormat;

public class FPAdder {
    public static void main(String[] args) {

	int numArgs = args.length;

	//this program requires at least two arguments on the command line
        if (numArgs < 2) {
            System.out.println("This program requires two command-line arguments.");
        } else {
	    double sum = 0.0;

	    for (int i = 0; i < numArgs; i++) {
                sum += Double.valueOf(args[i]).doubleValue();
	    }

	    //format the sum
	    DecimalFormat myFormatter = new DecimalFormat("###,###.##");
	    String output = myFormatter.format(sum);

	    //print the sum
            System.out.println(output);
        }
    }
}