Turn String aaaabbbbffffd into a4b4d3

Question

I\'m trying to get a head start on practicing interview questions and I came across this one:

Turn String aaaabbbbffffd into a4b4d3

You would basically want t

Answer 1

Here is my solution

public String countChars(String in){
 LinkedHashMapMap map = new LinkedHashMap();
 for(char c: in.toCharArray()){
   Integer count =  map.get(c);
   if(count==null){
    count=0;
   }
   count++;
   map.put(c,count);
 }
 String out ="";
 for(Entry e : map.entrySet()){
    out += e.getKey()+e.getValue();
 }
 return out;
}