汉字全角半角转换

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public class CharTransfer{

public static void main(String args[]) {

String BJstr="AB CDefghi1234*()@!@#";

      String result=BJ2QJ(BJstr);

      System.out.println(result);

}

/*
*全角 FF01 ！ FF02 ＂ FF03 ＃FF04 ＄ FF05 ％ ......FF5E ～
*半角 0021 ! 0022 " ......007E ~
* FF01 - 0021 = FEE0 =65248
*/

public static String QJ2BJ(String input) {
    char c[] = input.toCharArray();
          for (int i = 0; i < c.length; i++) {
            if (c[i] == '\u3000') {
              c[i] = ' ';
            } else if (c[i] > '\uFF00' && c[i] < '\uFF5F') {
              c[i] = (char) (c[i] - 65248);

            }
          }
     String returnString = new String(c);

          return returnString;

}
public static String BJ2QJ(String input) {
    char c[] = input.toCharArray();
          for (int i = 0; i < c.length; i++) {
            if (c[i] == ' ') {
              c[i] = '\u3000';
            } else if (c[i] > '\u0020' && c[i] < '\u007F') {
              c[i] = (char) (c[i] + 65248);

            }
          }
     String returnString = new String(c);

          return returnString;

}