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Groovy example source code file (moments.java)

This example Groovy source code file (moments.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

bufferedreader, bufferedreader, double, double, io, ioexception, ioexception, numberformat, string, text, util, vector, vector

The Groovy moments.java source code

// $Id: moments.java,v 1.1 2004-11-23 08:08:44 bfulgham Exp $
// http://www.bagley.org/~doug/shootout/

import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.Math;

public class moments {
    public static void main(String[] args) {
    String line;
    Vector nums = new Vector();
    double num, sum = 0.0;
    double mean = 0.0;
    double average_deviation = 0.0;
    double standard_deviation = 0.0;
    double variance = 0.0;
    double skew = 0.0;
    double kurtosis = 0.0;
    double median = 0.0;
    double deviation = 0.0;
    int i, n, mid = 0;

        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            while ((line = in.readLine()) != null) {
        num = Double.parseDouble(line);
        sum += num;
        nums.add(new Double(num));
            }
        } catch (IOException e) {
            System.err.println(e);
            return;
        }

    n = nums.size();
    mean = sum/n;
    for (i=0; i<n; i++) {
        deviation = ((Double)nums.get(i)).doubleValue() - mean;
        average_deviation += Math.abs(deviation);
        variance += Math.pow(deviation,2);
        skew += Math.pow(deviation,3);
        kurtosis += Math.pow(deviation,4);
    }
    average_deviation /= n;
    variance /= (n - 1);
    standard_deviation = Math.sqrt(variance);
    if (variance != 0.0) {
        skew /= (n * variance * standard_deviation);
        kurtosis = kurtosis/(n * variance * variance) - 3.0;
    }
    
    Collections.sort(nums);

    mid = (n/2);
    median = (n % 2 != 0) ?
        ((Double)nums.get(mid)).doubleValue() :
        (((Double)nums.get(mid)).doubleValue() +
         ((Double)nums.get(mid-1)).doubleValue())/2;
    
    NumberFormat nf = NumberFormat.getInstance();
    nf.setMaximumFractionDigits(13);
    nf.setGroupingUsed(false);
    nf.setMaximumFractionDigits(6);
    nf.setMinimumFractionDigits(6);

    System.out.println("n:                  " + n);
    System.out.println("median:             " + nf.format(median));
    System.out.println("mean:               " + nf.format(mean));
    System.out.println("average_deviation:  " + nf.format(average_deviation));
    System.out.println("standard_deviation: " + nf.format(standard_deviation));
    System.out.println("variance:           " + nf.format(variance));
    System.out.println("skew:               " + nf.format(skew));
    System.out.println("kurtosis:           " + nf.format(kurtosis));
    }
}

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