java 全角半角转换函数

/**
     * 半角转全角
     * @param input String.
     * @return 全角字符串.
     */
    public static String ToSBC(String input) {
             char c[] = input.toCharArray();
             for (int i = 0; i < c.length; i++) {
               if (c[i] == ' ') {
                 c[i] = 'u3000';
               } else if (c[i] < '177') {
                 c[i] = (char) (c[i] + 65248);

               }
             }
             return new String(c);
    }

    /**
     * 全角转半角
     * @param input String.
     * @return 半角字符串
     */
    public static String ToDBC(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 void main(String[] args) {

            String QJstr = "wch";

            String QJstr1 = "ｈｅｌｌｏ";

 

            String result = ToSBC(QJstr);

            String result1 = ToDBC(QJstr1);



            System.out.println(QJstr + "
" + result); 

            System.out.println(QJstr1 + "
" + result1);

    }