将字母转换为数字

Question

我想将字母A更改为第1点,因此字母Z为数字26,然后再次更改为数字27字母AA,AB为28.我如何？我必须使用"开关"吗？我用java程序.

Answer 1

没有测试这个,但这些方面的东西应该工作:

public String numberToCharacterRepresentation(int number) {
  char[] ls = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
  String r = "";
  while(true) {
    r = ls[number % 26] + r;
    if(number < 26) {
      break;
    }
    number /= 26;
  }
  return r;
}

相反:

public int stringToNumber(String str) {
  char[] ls = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
  Map<Character, Integer> m = new HashMap<Character, Integer>();
  int j = 0;
  for(char c: ls) {
    m.put(c, j++);
  }
  int i = 0;
  int mul = 1;
  for(char c: new StringBuffer(str).reverse().toString().toCharArray()) {
    i += m.get(c) * mul;
    mul *= ls.length;
  }
  return i;
}