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//Title of this code
//'main' method must be in a class 'Rextester'.

import java.util.*;
import java.lang.*;

class Rextester
{  
    public void findDup(String str){                 
        Map<Character, Integer> dupMap = new HashMap<Character, Integer>();  
        System.out.println("Check if key 2 exists: " + dupMap.size());
        char[] chrs = str.toCharArray();        
        for(Character ch:chrs){            
            if(dupMap.containsKey(ch)){  
                System.out.println("Check if key 2 exists: " + dupMap.containsKey(ch));
                dupMap.put(ch, dupMap.get(ch)+1);           
            } else {                
                dupMap.put(ch, 1);            
            }        
        }        
        Set<Character> keys = dupMap.keySet();        
        for(Character ch:keys){            
            if(dupMap.get(ch) > 1){               
                System.out.println(ch+"--->"+dupMap.get(ch));           
            }       
        }    
    }        
    public static void main(String a[]){        
        
        Rextester dcs = new Rextester();      
        dcs.findDup("aabbbbbcccccccddddddddd");   
    }
}

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Compilation time: 0.43 sec, absolute service time: 0.61 sec