public class CharTest { public static void main( String[] args ) { char a = 'A'; char b = (char) (a + 1); System.out.println( a ); System.out.println( b ); System.out.println( 'A' < 'B' ); char c = '\u6B22'; char d = '\u8FCE'; System.out.print( c ); System.out.println( d ); System.out.println( Character.isDigit( a ) ); System.out.println( Character.isLetter( a ) ); System.out.println( Character.isUpperCase( a ) ); System.out.println( Character.isLowerCase( a ) ); } }