2283. Check if Number Has Equal Digit Count and Digit Value

class Solution {
    public boolean digitCount(String s) {
HashMap<Character,Integer> hm = new HashMap<Character,Integer>();

for (int i = 0; i <s.length(); i++) {
	
	if(hm.containsKey(s.charAt(i))) {
		
		int tmp = hm.get(s.charAt(i));
		tmp++;
		hm.put(s.charAt(i), tmp);
	}
	else {
		hm.put(s.charAt(i),1);
	}
}
	for (int i = 0; i < s.length(); i++) {
		
		int tmp = Integer.parseInt(s.charAt(i)+"");
		char ch = (i+"").charAt(0);
		

		if(hm.get(ch)==null) {
			if(tmp!=0) {
				return false;
			}
		}else {
			
			if(hm.get(ch)!=tmp) {
				return false;
			}
			
		}
		
		
}
        return true;
    }
}