Count the number of each character in the character

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Count the number of each character in the character ：

import java.util.HashMap;

public class  Count the number of each character in the character  {

	public static void main(String[] args) {
		String str = "aaabbbbgbbccc";
		char[] ch = str.toCharArray();
		HashMap<Character,Integer> hm = new HashMap<>();
		for (char c : ch) {
			// If it contains this character, it is the number +1
			if (hm.containsKey(c)) {
				hm.put(c,hm.get(c) + 1);
			}else {
				hm.put(c, 1);
			}
		}
		System.out.println(hm);
	}
}

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