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DATE4J is a simple alternative to the standard JDK date classes. It was created by Hirondelle Systems (John O'Hanley).

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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.
 *
 */
package org.intelligentsia.hirondelle.date4j;

import java.lang.reflect.Array;
import java.util.logging.Logger;

final class Util  {

  static boolean textHasContent(String aText) {
    return (aText != null) && (aText.trim().length() > 0);
  }
  
  static String quote(Object aObject){
    return SINGLE_QUOTE + String.valueOf(aObject) + SINGLE_QUOTE; 
  }
  
  static String getArrayAsString(Object aArray){
    final String fSTART_CHAR = "[";
    final String fEND_CHAR = "]";
    final String fSEPARATOR = ", ";
    final String fNULL = "null";
    
    if ( aArray == null ) return fNULL;
    checkObjectIsArray(aArray);

    StringBuilder result = new StringBuilder( fSTART_CHAR );
    int length = Array.getLength(aArray);
    for ( int idx = 0 ; idx < length ; ++idx ) {
      Object item = Array.get(aArray, idx);
      if ( isNonNullArray(item) ){
        //recursive call!
        result.append( getArrayAsString(item) );
      }
      else{
        result.append( item );
      }
      if ( ! isLastItem(idx, length) ) {
        result.append(fSEPARATOR);
      }
    }
    result.append(fEND_CHAR);
    return result.toString();
  }

  static Logger getLogger(Class aClass){
    return Logger.getLogger(aClass.getPackage().getName());  
  }
  
  // PRIVATE
  
  private static final String SINGLE_QUOTE = "'";
  
  private static boolean isNonNullArray(Object aItem){
    return aItem != null && aItem.getClass().isArray();
  }

  private static void checkObjectIsArray(Object aArray){
    if ( ! aArray.getClass().isArray() ) {
      throw new IllegalArgumentException("Object is not an array.");
    }
  }

  private static boolean isLastItem(int aIdx, int aLength){
    return (aIdx == aLength - 1);
  }
  
}