java实现获取字符串中出现次数最多的字符并记录下来

// 获取字符串  出现次数最多的字符
	public static HashMap but(String tar) {
		String[] split = tar.split("");
		HashMap hashMap = new HashMap();
		hashMap.put(split[0], 1);
		for (int i = 1; i < split.length; i++) {
			Integer integer = hashMap.get(split[i]);
			if(integer == null || integer == 0) {
				hashMap.put(split[i], 1);
			}
			else {
				hashMap.put(split[i], integer + 1);
			}
		}
		return hashMap;
	}

main

		HashMap but = but("cdfsccccdaasa");
		int [] count = new int[but.size()];
		int index = 0;
		for (String i : but.keySet()) {
			  count[index] = but.get(i);
			  index ++;
			  System.out.println("Key: "+i+" Value: "+but.get(i));
		}
		int max = count[0];
		for (int i = 1; i < count.length; i++) {
			if(max < count[i]) {
				max = count[i];
			}
		}

		System.out.println(max);