Ejemplo

public static void main(String[] args){
char ch = '\u4e2d';
System.out.println(Character.toLowerCase(ch));
}
Solución
Utilice el método J2SE 1.5.0 siguiente
java.lang.Character.toLowerCase (int)

public static void main(String[] args){
int c1 = 0x10400;
int c2 = Character.toLowerCase(c1);

System.out.println(Integer.toHexString(c2));
}
Solución
Utilice ICU 2.6.1com.ibm.icu.lang.UCharacter, with
  • com.ibm.icu.lang.UCharacter.toLowerCase (int)

public static void main(String[] args){
int c1 = 0x10400;
int c2 = com.ibm.icu.lang.UCharacter.toLowerCase(c1);
System.out.println(Integer.toHexString(c2));
}