Java——计算输入字符串重复次数

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class Main {
	public static void main(String []args) {
		Scanner in = new Scanner(System.in);
		String a = in.next();
		Mapmap = new HashMap();
		for(int i = 0; i < a.length(); i++) {
			if(map.get(a.charAt(i))!=null) {
				map.put(a.charAt(i), map.get(a.charAt(i))+1);
			}else {
				map.put(a.charAt(i),1);
			}
		}
		System.out.println(map);
	}
}