用于测试字符和转换大小写的字符静态方法。

import java.util.Scanner;/*N o w  J a v a  . c o m*/


public class Main 

{

   public static void main(String[] args)

   {

      Scanner scanner = new Scanner(System.in); // create scanner

      System.out.println("Enter a character and press Enter");

      String input = scanner.next(); 

      char c = input.charAt(0); // get input character


      // display character info

      System.out.printf("is defined: %b\n", Character.isDefined(c));

      System.out.printf("is digit: %b\n", Character.isDigit(c));

      System.out.printf("is first character in a Java identifier: %b\n",

         Character.isJavaIdentifierStart(c));/** nowjava - 时代Java 提 供 **/

      System.out.printf("is part of a Java identifier: %b\n",

         Character.isJavaIdentifierPart(c));

      System.out.printf("is letter: %b\n", Character.isLetter(c));

      System.out.printf(

         "is letter or digit: %b\n", Character.isLetterOrDigit(c));

      System.out.printf(

         "is lower case: %b\n", Character.isLowerCase(c));

      System.out.printf(