java 字符与ASC码互转

 /**
  * 字符转ASC
  * @param st
  * @return
  */
 private int getAsc(String st) {
  byte[] gc = st.getBytes();
  int ascNum = (int) gc[0];
  return ascNum;
 }

 /**
  * ASC转字符
  * @param backnum
  * @return
  */
 private static char backchar(int backnum) {
  char strChar = (char) backnum;
  return strChar;
 }