Determines if the specified string is permissible as a Java identifier. : Character Data Type « Data Type « Java Tutorial

Home
Java Tutorial
1.Language
2.Data Type
3.Operators
4.Statement Control
5.Class Definition
6.Development
7.Reflection
8.Regular Expressions
9.Collections
10.Thread
11.File
12.Generics
13.I18N
14.Swing
15.Swing Event
16.2D Graphics
17.SWT
18.SWT 2D Graphics
19.Network
20.Database
21.Hibernate
22.JPA
23.JSP
24.JSTL
25.Servlet
26.Web Services SOA
27.EJB3
28.Spring
29.PDF
30.Email
31.J2ME
32.J2EE Application
33.XML
34.Design Pattern
35.Log
36.Security
37.Apache Common
38.Ant
39.JUnit
Java Tutorial » Data Type » Character Data Type 
2.7.40.Determines if the specified string is permissible as a Java identifier.Previous/Next
/*
 * 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 is permissible as a Java identifier.
   * Returns true if the string is non-null, non-zero length with a Java
   * identifier start as the first character and Java identifier parts in all
   * remaining characters.
   @param test the string to be tested.
   @return true if the string is a Java identifier, false otherwise.
   @see java.lang.Character#isJavaIdentifierPart(char)
   @see java.lang.Character#isJavaIdentifierStart(char)
   */
  public static boolean isJavaIdentifier(String test)
  {
      if (test == null || test.length() == 0)
      {
          return false;
      }

      if (!Character.isJavaIdentifierStart(test.charAt(0)) && test.charAt(0!= '_')
      {
          return false;
      }

      for (int i = 1; i < test.length(); i++)
      {
          if (!Character.isJavaIdentifierPart(test.charAt(i)) && test.charAt(i!= '_')
          {
              return false;
          }
      }

      return true;
  }

}
2.7.Character Data Type
2.7.1.Java char: char is 16 bit type and used to represent Unicode characters. Range of char is 0 to 65,536.
2.7.2.Escape Sequence Characters
2.7.3.Storing Characters
2.7.4.Assign int value to char variable
2.7.5.char variables behave like integers
2.7.6.Display printable Characters
2.7.7.Character: is Upper Case
2.7.8.Character: is Lower Case
2.7.9.isDigit(): true if the argument is a digit (0 to 9), and false otherwise.
2.7.10.Validate if a String contains only numbers
2.7.11.isLetter(): true if the argument is a letter, and false otherwise.
2.7.12.Count letters in a String
2.7.13.isLetterOrDigit(): true if the argument is a letter or a digit, and false otherwise.
2.7.14.is White space
2.7.15.Is character a digit, letter, white space, lower case or upper case character
2.7.16.Convert character to digit with Character.digit
2.7.17.Demonstrate several Is... methods.
2.7.18.Convert from ASCII code to String
2.7.19.Convert from integer to ASCII code (byte)
2.7.20.To extract Ascii codes from a String
2.7.21.Copy char array to string
2.7.22.Store unicode in a char variable
2.7.23.Determining a Character's Unicode Block
2.7.24.Plus one to char variable
2.7.25.Convert string to char array
2.7.26.Compare Two Java char Arrays
2.7.27.Max and Min values of datatype char
2.7.28.Determining If a String Is a Legal Java Identifier
2.7.29.compare two objects of Character
2.7.30.ASCII character handling functions
2.7.31.Checks if the string contains only ASCII printable characters.
2.7.32.Checks whether the character is ASCII 7 bit alphabetic lower case.
2.7.33.Checks whether the character is ASCII 7 bit alphabetic upper case.
2.7.34.Checks whether the character is ASCII 7 bit alphabetic.
2.7.35.Checks whether the character is ASCII 7 bit control.
2.7.36.Checks whether the character is ASCII 7 bit numeric and character.
2.7.37.Checks whether the character is ASCII 7 bit numeric.
2.7.38.Checks whether the character is ASCII 7 bit printable.
2.7.39.Checks whether the character is ASCII 7 bit.
2.7.40.Determines if the specified string is permissible as a Java identifier.
2.7.41.Thansform an array of ASCII bytes to a string. the byte array should contains only values in [0, 127].
2.7.42.Utility methods for ASCII character checking.
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.