Get the Number of Duplicate Elements in the List or Array

public class NoOfDuplicateElementsInTheList {

public static void main(String[] args) {

// TODO Auto-generated method stub

String[] arr = {"cat","dog","cow","cat","dog","mice"};

Map<String,Integer> mp= new HashMap<String,Integer>();

for(int i=0;i<arr.length;i++){

if(mp.containsKey(arr[i])){

mp.put(arr[i], mp.get(arr[i])+1) ;

}else{

mp.put(arr[i], 1);

}

}

for(Entry<String,Integer> e : mp.entrySet()){

System.out.println(e.getKey() +"-"+e.getValue());

}

}

}