public static Character FindFirstKChar(String str,int k){ String s = str.replaceAll(" ",""); Map<Character, Integer> charCountMap = new HashMap<Character, Integer>(); Character ch = null; for(int i = 0; i < s.length(); i++){ if(charCountMap.containsKey(s.charAt(i))){ charCountMap.put(s.charAt(i), charCountMap.get(s.charAt(i))+1); }else{ charCountMap.put(s.charAt(i), 1); } if(charCountMap.get(s.charAt(i))==3){ ch=s.charAt(i); break; } } return ch; }
时间: 2024-08-06 16:06:21