Returns a String in the format Xhrs, Ymins, Z sec, for the time difference between two times : Timing « Development « Java Tutorial

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Collection;


/**
 * General string utils
 */
public class StringUtils {

  final public static char COMMA = ',';
  final public static String COMMA_STR = ",";
  final public static char ESCAPE_CHAR = '\\';
  private static DecimalFormat oneDecimal = new DecimalFormat("0.0");
  
  /**
   * 
   * Given a finish and start time in long milliseconds, returns a 
   * String in the format Xhrs, Ymins, Z sec, for the time difference between two times. 
   * If finish time comes before start time then negative valeus of X, Y and Z wil return. 
   * 
   * @param finishTime finish time
   * @param startTime start time
   */
  public static String formatTimeDiff(long finishTime, long startTime){
    StringBuffer buf = new StringBuffer();
    
    long timeDiff = finishTime - startTime; 
    long hours = timeDiff / (60*60*1000);
    long rem = (timeDiff % (60*60*1000));
    long minutes =  rem / (60*1000);
    rem = rem % (60*1000);
    long seconds = rem / 1000;
    
    if (hours != 0){
      buf.append(hours);
      buf.append("hrs, ");
    }
    if (minutes != 0){
      buf.append(minutes);
      buf.append("mins, ");
    }
    // return "0sec if no difference
    buf.append(seconds);
    buf.append("sec");
    return buf.toString(); 
  }
}