Test if the character is a digit <digit> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' : String ASCII « Data Type « Java






  1. Java
  2. Data Type
  3. String ASCII

Test if the character is a digit <digit> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'

  
import java.io.File;
import java.io.FileFilter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

/*
 *  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. 
 *  
 */



/**
 * 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 {
  /** '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' */
  private static final boolean[] DIGIT =
      { 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          true,  true,  true,  true,  true,  true,  true,  true, 
          true,  true,  false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false
      };


  /**
   * Test if the character is a digit &lt;digit> ::= '0' | '1' | '2' |
   * '3' | '4' | '5' | '6' | '7' | '8' | '9'
   * 
   * @param chars
   *            The buffer which contains the data
   * @return <code>true</code> if the current character is a Digit
   */
  public static final boolean isDigit( char[] chars )
  {
      if ( ( chars == null ) || ( chars.length == 0 ) )
      {
          return false;
      }
      else
      {
          return ( ( ( ( chars[0] | 0x7F ) != 0x7F ) || !DIGIT[chars[0]] ) ? false : true );
      }
  }
}








Related examples in the same category

1.Checks whether the character is ASCII 7 bit.
2.Checks whether the character is ASCII 7 bit printable.
3.Checks whether the character is ASCII 7 bit control.
4.Checks whether the character is ASCII 7 bit alphabetic.
5.Checks whether the character is ASCII 7 bit alphabetic upper case.
6.Checks whether the character is ASCII 7 bit alphabetic lower case.
7.Checks whether the character is ASCII 7 bit numeric.
8.Checks whether the character is ASCII 7 bit numeric and character.
9.Allow text containing mostly ASCII characters to be decipherable on an ASCII terminal without decoding.
10.Removes control characters (char <= 32) from both ends returning null if the String is empty ("") after the trim or if it is null
11.Removes control characters (char <= 32) from both ends returning an empty String ("") if the String is empty ("") after the trim or if it is null.
12.Get 7-bit ASCII character array from input String.
13.Test if the current character is a digit <digit> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
14.Test if the current character is a new line.
15.Test if the current character is a space.
16.Test if the current character is an Alpha character : <alpha> ::= [0x41-0x5A] | [0x61-0x7A]
17.Test if the current character is an Ident character
18.Test if the current character is equal to a specific character.
19.Test if the current string is a digit <digit> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
20.Removes spaces (char <= 32) from both start and ends of this bytes array
21.Removes spaces (char <= 32) from end of this String with escape, handling null by returning null
22.Removes spaces (char <= 32) from end of this String, handling null by returning null
23.Removes spaces (char <= 32) from end of this array by index, handling null by returning null
24.Removes spaces (char <= 32) from end of this array ny position, handling null by returning null
25.Removes spaces (char <= 32) from end of this array, handling null by returning null
26.Removes spaces (char <= 32) from start of this String, handling null by returning null
27.Removes spaces (char <= 32) from start of this array, handling null by returning null
28.Thansform an array of ASCII bytes to a string. the byte array should contains only values in [0, 127].