Checks whether the character is ASCII 7 bit alphabetic upper case. : Character Data Type « Data Type « Java Tutorial

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 * 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
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 * See the License for the specific language governing permissions and
 * limitations under the License.

 * Operations on char primitives and Character objects.
 * This class tries to handle <code>null</code> input gracefully.
 * An exception will not be thrown for a <code>null</code> input.
 * Each method documents its behaviour in more detail.
 * @author Stephen Colebourne
 * @since 2.1
 * @version $Id: 437554 2006-08-28 06:21:41Z bayard $
public class Main {
   * Checks whether the character is ASCII 7 bit alphabetic upper case.
   * <pre>
   *   CharUtils.isAsciiAlphaUpper('a')  = false
   *   CharUtils.isAsciiAlphaUpper('A')  = true
   *   CharUtils.isAsciiAlphaUpper('3')  = false
   *   CharUtils.isAsciiAlphaUpper('-')  = false
   *   CharUtils.isAsciiAlphaUpper('\n') = false
   *   CharUtils.isAsciiAlphaUpper('&copy;') = false
   * </pre>
   * @param ch  the character to check
   * @return true if between 65 and 90 inclusive
  public static boolean isAsciiAlphaUpper(char ch) {
      return ch >= 'A' && ch <= 'Z';

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. 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 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.