Check whether the given String contains any whitespace characters. : String char « Data Type « Java






  1. Java
  2. Data Type
  3. String char

Check whether the given String contains any whitespace characters.

    

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * Licensed 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 jacky.lanlan.song.extension.struts.util;

/**
 * Miscellaneous {@link String} utility methods.
 *
 * <p>Mainly for internal use within the framework; consider
 * <a href="http://jakarta.apache.org/commons/lang/">Jakarta's Commons Lang</a>
 * for a more comprehensive suite of
 * {@link org.apache.commons.lang.StringUtils String utilities}.
 *
 * <p>This class delivers some simple functionality that should really
 * be provided by the core Java <code>String</code> and {@link StringBuffer}
 * classes, such as the ability to {@link #replace} all occurrences of a given
 * substring in a target string. It also provides easy-to-use methods to
 * convert between delimited strings, such as CSV strings, and collections and
 * arrays.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rob Harrop
 * @author Rick Evans
 * @author Jacky.Song
 * @since 16 April 2001
 */
abstract class StringUtils {



  /**
   * Check whether the given String contains any whitespace characters.
   * @param str the String to check (may be <code>null</code>)
   * @return <code>true</code> if the String is not empty and
   * contains at least 1 whitespace character
   * @see java.lang.Character#isWhitespace
   */
  public static boolean containsWhitespace(String str) {
    if (!hasLength(str)) {
      return false;
    }
    int strLen = str.length();
    for (int i = 0; i < strLen; i++) {
      if (Character.isWhitespace(str.charAt(i))) {
        return true;
      }
    }
    return false;
  }
  /**
   * Check that the given String is neither <code>null</code> nor of length 0.
   * Note: Will return <code>true</code> for a String that purely consists of whitespace.
   * <p><pre>
   * StringUtils.hasLength(null) = false
   * StringUtils.hasLength("") = false
   * StringUtils.hasLength(" ") = true
   * StringUtils.hasLength("Hello") = true
   * </pre>
   * @param str the String to check (may be <code>null</code>)
   * @return <code>true</code> if the String is not null and has length
   * @see #hasText(String)
   */
  public static boolean hasLength(String str) {
    return (str != null && str.length() > 0);
  }

}








Related examples in the same category

1.StrCharAt - show String.charAt()
2.Basic tab-character handling stuff
3.Convert Characters to Lower Case
4.Convert Characters to Upper Case
5.Replace Characters in a String
6.Character array to String conversion
7.Convert String to character array
8.Last occurrence of a character
9.Extract Ascii codes from a String
10.To remove a character
11.Removes specified chars from a string
12.Checks if a String is not empty (""), not null and not whitespace only.
13.Checks if a String is whitespace, empty ("") or null.
14.Checks if the String contains any character in the given set of characters.
15.Checks if the String contains only certain characters.
16.Checks if the String contains only whitespace.
17.Checks if the string contains only ASCII printable characters.
18.Checks that the String does not contain certain characters.
19.The character array based string
20.Checks whether the String contains only digit characters.
21.Remove char from a string
22.Remove whitespace from the ends as well as excessive whitespace within the inside of the string between non-whitespace characters.
23.Removes any hypens ( - ) from the given string
24.Returns a new string with all the whitespace removed
25.Is char a white space character
26.Simple scanner that allows to navigate over the characters of a string.
27.Returns a string with size of count and all characters initialized with ch.
28.Returns a string that contains all characters of the given string in reverse order.
29.Returns a string that is equivalent to the specified string with its first character converted to uppercase
30.Count the number of occurrences of character c in a string.
31.A fast way to convert character arrays into Strings.
32.XML utilities that pertain to character handling (markup or character data), without use of any XML libraries.
33.Character utilities.
34.Provides a number of static methods which interact with java.nio.charset.Charset to analyze and transform the strings identifing character encodings.
35.Operations on char primitives and Character objects.
36.Cleans strings of illegal characters with respect to the XML specification.
37.Return the result of adding the specified character to the specified sorted character array.
38.Return a displayable version of the character sequence, followed by integer positions at various powers of 10.
39.Returns the string constructed from the specified character sequence by deaccenting each of its characters.
40.Returns a hash code for a character sequence that is equivalent to the hash code generated for a its string yield.
41.Return true if the two character sequences have the same length and the same characters.
42.Returns an array of substrings of the specified string, in order, with divisions before and after any instance of the specified character.
43.Returns true if specified character is a punctuation character.
44.Appends a whitespace-normalized form of the specified character sequence into the specified string buffer.
45.Determine whether characters may appear in certain roles in XML documents.
46.Advanced navigation over the underlying string.
47.Compare two char sequences
48.Contents As CharSequence