Removes spaces (char <= 32) from end of this String with escape, handling null by returning null : String vs Char Array « Data Type « Java Tutorial






  1. Java Tutorial
  2. Data Type
  3. String vs Char Array
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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
 *  
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/**
 * Various string manipulation methods that are more efficient then chaining
 * string operations: all is done in the same buffer without creating a bunch of
 * string objects.
 * 
 * @author <a href="mailto:dev@labs.apache.org">Dungeon Project</a>
 */
public class Main {

  /**
   * 
   * Removes spaces (char &lt;= 32) from end of this String, handling
   * <code>null</code> by returning <code>null</code>.
   * 
   * Trim removes start characters &lt;= 32.
   * 
   * <pre>
   *  StringUtils.trimRight(null)          = null
   *  StringUtils.trimRight(&quot;&quot;)            = &quot;&quot;
   *  StringUtils.trimRight(&quot;     &quot;)       = &quot;&quot;
   *  StringUtils.trimRight(&quot;abc&quot;)         = &quot;abc&quot;
   *  StringUtils.trimRight(&quot;    abc    &quot;) = &quot;    abc&quot;
   * </pre>
   * 
   * @param str the String to be trimmed, may be null
   * @param escapedSpace The last escaped space, if any
   * @return the trimmed string, <code>null</code> if null String input
   */
  public static final String trimRight( String str, int escapedSpace )
  {
      if ( isEmpty( str ) )
      {
          return "";
      }

      int length = str.length();
      int end = length;
      
      while ( ( end > 0 ) && ( str.charAt( end - 1 ) == ' ' ) && ( end > escapedSpace ) )
      {
          if ( ( end > 1 ) && ( str.charAt(  end - 2 ) == '\\' ) )
          {
              break;
          }
          
          end--;
      }

      return ( end == length ? str : str.substring( 0, end ) );
  }
  /**
   * 
   * Checks if a String is empty ("") or null.
   * 
   * 
   * <pre>
   *  StringUtils.isEmpty(null)      = true
   *  StringUtils.isEmpty(&quot;&quot;)        = true
   *  StringUtils.isEmpty(&quot; &quot;)       = false
   *  StringUtils.isEmpty(&quot;bob&quot;)     = false
   *  StringUtils.isEmpty(&quot;  bob  &quot;) = false
   * </pre>
   * 
   * 
   * NOTE: This method changed in Lang version 2.0. It no longer trims the
   * String. That functionality is available in isBlank().
   * 
   * 
   * @param str
   *            the String to check, may be null
   * @return <code>true</code> if the String is empty or null
   */
  public static final boolean isEmpty( String str )
  {
      return str == null || str.length() == 0;
  }
}








2.28.String vs Char Array
2.28.1.Demonstrates the charAt and getChars
2.28.2.Converting Char array to String
2.28.3.Creating Character Arrays From String Objects
2.28.4.Copy characters from string into char Array
2.28.5.Creating String Objects From Character Arrays
2.28.6.new String(textArray, 9, 3): Creating String Objects From certain part of a character Array
2.28.7.Creating String Objects From Character Arrays using String.copyValueOf()
2.28.8.Creating a string from a subset of the array elements
2.28.9.Extracting a substring as an array of characters using the method getChars()
2.28.10.Using the Collection-Based for Loop with a String: Counting all vowels in a string
2.28.11.Construct one String from another.
2.28.12.demonstrates getChars( ):
2.28.13.implements CharSequence
2.28.14.Removes spaces (char <= 32) from end of this String with escape, handling null by returning null
2.28.15.Removes spaces (char <= 32) from end of this String, handling null by returning null
2.28.16.Swaps the case of a String changing upper and title case to lower case, and lower case to upper case.
2.28.17.Deletes all whitespaces from a String as defined by Character.isWhitespace(char).
2.28.18.Checks whether the String contains only digit characters.
2.28.19.Checks that the String does not contain certain characters.