public static void firstNoRepeatingChar(String str) {		char[] strArr = str.toCharArray();		Map
    
      mapc = new HashMap
     
      ();		for (char c : strArr) {			if (mapc.get(c) == null) {				mapc.put(c, 1);			} else {				mapc.put(c, mapc.get(c) + 1);			}		}		Set
      
        sc = mapc.keySet();		for (char c : sc) {			if (mapc.get(c) == 1) {				System.out.println(c);				break;			}		}		int[] strArr1 = new int[256];		for(char c : strArr){			strArr1[c]++;		}				for(int i = 0; i < 256; i++){			if(strArr1[i] == 1){				System.out.println((char)i);				break;			}		}	}