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Android中字符串操作简介

Android中字符串操作简介

作者: kjy_112233 | 来源:发表于2017-08-17 13:04 被阅读0次

    字符串排序(冒泡排序)

    public static String strSort(String str){
      char[] chars = str.toCharArray();
      for (int i = 0; i < chars.length - 1; i++) {
        for (int j = i + 1; j < chars.length; j++) {
          if(chars[i] < chars[j]){
            char temp = chars[i];
            chars[i] = chars[j];
            chars[j] = temp;
          }
        }
      }
      return new String(chars);
    }
    

    字符串比较大小

    public static int strSort(String str1, String str2) {
      char[] chars1 = str1.toCharArray();
      char[] chars2 = str2.toCharArray();
      int size = chars1.length < chars2.length ? chars1.length : chars2.length;
      for (int i = 0; i < size; i++) {
        if (intCompare(chars1[i], chars2[i]) != 0)
          return intCompare(chars1[i], chars2[i]);
      }
      return intCompare(chars1.length, chars2.length);
    }
    
    private static int intCompare(char char1, char char2) {
      if (char1 > char2) {
        return 1;
      } else if (char1 < char2) {
        return -1;
      } else {
        return 0;
      }
    }
    
    private static int intCompare(int char1, int char2) {
      if (char1 < char2) {
        return -1;
      } else if (char1 > char2) {
        return 1;
      } else {
        return 0;
      }
    }
    

    反转字符串

    public static String reverseString(String str) {
      if (str == null || str.length() < 2)
        return str;
      return reverseString(str.substring(1, str.length())) + str.charAt(0);
    }
    

    获取某段字符

    public static String cutOutString(String str) {
      return str.substring(str.indexOf("ah"), str.indexOf("bd"));
    }
    

    判断字符串中出现的子字符串的次数

    public static int countStr(String str, String key) {
      int total = 0;
      for (String tmp = str; tmp != null && tmp.length() >= key.length(); ) {
        if (tmp.indexOf(key) == 0)
            total++;
          tmp = tmp.substring(1);
      }
        return total;
    }
    

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