Find duplicates in a string and count repeated letters

Question

Accepted Answer

Find duplicates in a string and count repeated letters

Iterate through each character in the string
Use a hash map to store the count of each character
If a character is already present in the hash map, increment its count
After iterating through the string, filter the hash map to get the duplicate characters and their counts

Accepted Answer

in java, using a hashmap we can count the occurances as well as get the unique ones while doing so.

String str = "SoommeeString";

HashMap hm = new HashMap<>();

for(int i=0;i

hm.put(str.charAt(i),hm.getOrDefault(str.charAt(i),0)+1);

}

//traversing through the map will give dupliactes and their counts.

for(char i : hm.keySet()){

if(hm.get(i)>1){System.out.println(i+"has a count of " + hm.get(i));}

}

Popular interview questions of Senior Software Engineer Testing