Determines if the specified string contains only Unicode letters or digits as defined by Character#isLetterOrDigit(char) : String search « Data Type « Java

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Java » Data Type » String search Screenshots  Determines if the specified string contains only Unicode letters or digits as defined by Character#isLetterOrDigit(char)    /*  * Copyright 2005 Joe Walker  *  * 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.  */ import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.ObjectInputStream; /**  * @author Joe Walker [joe at getahead dot ltd dot uk]  */ public class Main {   /**    * Determines if the specified string contains only Unicode letters or    * digits as defined by {@link Character#isLetterOrDigit(char)}    * @param test The string to test    * @return true if the string is non-null, non-empty and contains only    * characters that are unicode letters or digits    * @see Character#isLetterOrDigit(char)    */   public static boolean isLetterOrDigitOrUnderline(String test)   {       if (test == null || test.length() == 0)       {           return false;       }       for (int i = 0; i < test.length(); i++)       {           if (!Character.isLetterOrDigit(test.charAt(i)) && test.charAt(i) != '_')           {               return false;           }       }       return true;   } }             Related examples in the same category 1.  String Region Match Demo 2.  Palindrome 3.  Look for particular sequences in sentences 4.  Strings -- extract printable strings from binary file 5.  Java Search String 6.  Java String endsWith 7.  Java String startsWith 8.  Search a substring Anywhere 9.  Starts with, ignore case( regular expressions ) 10.  Ends with, ignore case( regular expressions ) 11.  Anywhere, ignore case( regular expressions ) 12.  Searching a String for a Character or a Substring 13.  Not found returns -1 14.  If a string contains a specific word 15.  Not found 16.  if a String starts with a digit or uppercase letter 17.  Search a String to find the first index of any character in the given set of characters. 18.  Search a String to find the first index of any character not in the given set of characters. 19.  Searches a String for substrings delimited by a start and end tag, returning all matching substrings in an array. 20.  Helper functions to query a strings end portion. The comparison is case insensitive. 21.  Helper functions to query a strings start portion. The comparison is case insensitive. 22.  Wrapper for arrays of ordered strings. This verifies the arrays and supports efficient lookups. 23.  Returns an index into arra (or -1) where the character is not in the charset byte array. 24.  Returns an int[] array of length segments containing the distribution count of the elements in unsorted int[] array with values between min and max (range). 25.  Returns the next index of a character from the chars string 26.  Finds the first index within a String, handling null. 27.  Finds the last index within a String from a start position, handling null. 28.  Finds the n-th index within a String, handling null. 29.  Case insensitive check if a String ends with a specified suffix. 30.  Case insensitive check if a String starts with a specified prefix. 31.  Case insensitive removal of a substring if it is at the begining of a source string, otherwise returns the source string. 32.  Case insensitive removal of a substring if it is at the end of a source string, otherwise returns the source string. 33.  Check if a String ends with a specified suffix. 34.  Check if a String starts with a specified prefix. 35.  Determine if a String is contained in a String Collection 36.  Determine if a String is contained in a String Collection, ignoring case 37.  Determine if a String is contained in a String [], ignoring case 38.  Determine if a String is contained in a String [], ignoring case or not as specified 39.  Determine if a String is contained in a String[] 40.  Determining the validity of various XML names 41.  Return the nth index of the given token occurring in the given string