Returns a formatted String from time : Timing « Development « Java Tutorial

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/**
 * $Revision: 10205 $
 * $Date: 2008-04-11 15:48:27 -0700 (Fri, 11 Apr 2008) $
 *
 * Copyright (C) 2004-2008 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution, or a commercial license
 * agreement with Jive.
 */

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.BreakIterator;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Utility class to peform common String manipulation algorithms.
 */
public class StringUtils {

    // Constants used by escapeHTMLTags
    private static final char[] QUOTE_ENCODE = """.toCharArray();
    private static final char[] AMP_ENCODE = "&".toCharArray();
    private static final char[] LT_ENCODE = "<".toCharArray();
    private static final char[] GT_ENCODE = ">".toCharArray();

    private StringUtils() {
        // Not instantiable.
    }
    /**
     * Returns a formatted String from time.
     *
     * @param diff the amount of elapsed time.
     * @return the formatte String.
     */
    public static String getTimeFromLong(long diff) {
        final String HOURS = "h";
        final String MINUTES = "min";
        final String SECONDS = "sec";

        final long MS_IN_A_DAY = 1000 * 60 * 60 * 24;
        final long MS_IN_AN_HOUR = 1000 * 60 * 60;
        final long MS_IN_A_MINUTE = 1000 * 60;
        final long MS_IN_A_SECOND = 1000;
        Date currentTime = new Date();
        long numDays = diff / MS_IN_A_DAY;
        diff = diff % MS_IN_A_DAY;
        long numHours = diff / MS_IN_AN_HOUR;
        diff = diff % MS_IN_AN_HOUR;
        long numMinutes = diff / MS_IN_A_MINUTE;
        diff = diff % MS_IN_A_MINUTE;
        long numSeconds = diff / MS_IN_A_SECOND;
        diff = diff % MS_IN_A_SECOND;
        long numMilliseconds = diff;

        StringBuffer buf = new StringBuffer();
        if (numHours > 0) {
            buf.append(numHours + " " + HOURS + ", ");
        }

        if (numMinutes > 0) {
            buf.append(numMinutes + " " + MINUTES);
        }

        //buf.append(numSeconds + " " + SECONDS);

        String result = buf.toString();

        if (numMinutes < 1) {
            result = "< 1 minute";
        }

        return result;
    }

}