Gets the substring after the last occurrence of a separator. The separator is not returned. : String substring « Data Type « Java





Gets the substring after the last occurrence of a separator. The separator is not returned.

     


/**
 * 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.
 */




/**
 * <p>Operations on {@link java.lang.String} that are
 * <code>null</code> safe.</p>

 *
 * @see java.lang.String
 * @author <a href="http://jakarta.apache.org/turbine/">Apache Jakarta Turbine</a>
 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
 * @author Daniel L. Rall
 * @author <a href="mailto:gcoladonato@yahoo.com">Greg Coladonato</a>
 * @author <a href="mailto:ed@apache.org">Ed Korthof</a>
 * @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
 * @author Stephen Colebourne
 * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
 * @author Holger Krauth
 * @author <a href="mailto:alex@purpletech.com">Alexander Day Chaffee</a>
 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
 * @author Arun Mammen Thomas
 * @author Gary Gregory
 * @author Phil Steitz
 * @author Al Chou
 * @author Michael Davey
 * @author Reuben Sivan
 * @author Chris Hyzer
 * @author Scott Johnson
 * @since 1.0
 * @version $Id: StringUtils.java 635447 2008-03-10 06:27:09Z bayard $
 */
public class Main {
  /**
   * <p>Gets the substring after the last occurrence of a separator.
   * The separator is not returned.</p>
   *
   * <p>A <code>null</code> string input will return <code>null</code>.
   * An empty ("") string input will return the empty string.
   * An empty or <code>null</code> separator will return the empty string if
   * the input string is not <code>null</code>.</p>
   *
   * <pre>
   * StringUtils.substringAfterLast(null, *)      = null
   * StringUtils.substringAfterLast("", *)        = ""
   * StringUtils.substringAfterLast(*, "")        = ""
   * StringUtils.substringAfterLast(*, null)      = ""
   * StringUtils.substringAfterLast("abc", "a")   = "bc"
   * StringUtils.substringAfterLast("abcba", "b") = "a"
   * StringUtils.substringAfterLast("abc", "c")   = ""
   * StringUtils.substringAfterLast("a", "a")     = ""
   * StringUtils.substringAfterLast("a", "z")     = ""
   * </pre>
   *
   * @param str  the String to get a substring from, may be null
   * @param separator  the String to search for, may be null
   * @return the substring after the last occurrence of the separator,
   *  <code>null</code> if null String input
   * @since 2.0
   */
  public static String substringAfterLast(String str, String separator) {
      if (isEmpty(str)) {
          return str;
      }
      if (isEmpty(separator)) {
          return "";
      }
      int pos = str.lastIndexOf(separator);
      if (pos == -1 || pos == (str.length() - separator.length())) {
          return "";
      }
      return str.substring(pos + separator.length());
  }
  // Empty checks
  //-----------------------------------------------------------------------
  /**
   * <p>Checks if a String is empty ("") or null.</p>
   *
   * <pre>
   * StringUtils.isEmpty(null)      = true
   * StringUtils.isEmpty("")        = true
   * StringUtils.isEmpty(" ")       = false
   * StringUtils.isEmpty("bob")     = false
   * StringUtils.isEmpty("  bob  ") = false
   * </pre>
   *
   * <p>NOTE: This method changed in Lang version 2.0.
   * It no longer trims the String.
   * That functionality is available in isBlank().</p>
   *
   * @param str  the String to check, may be null
   * @return <code>true</code> if the String is empty or null
   */
  public static boolean isEmpty(String str) {
      return str == null || str.length() == 0;
  }


}

   
    
    
    
    
  










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