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One of the most common ways to find duplicates is by using the brute force method, which compares each element of the array to every other element. This solution has the time complexity of O(n^2) and only exists for academic purposes.
If you want to count duplicates for a given element then use the count() function. Use a counter() function or basics logic combination to find all duplicated elements in a list and count them in Python.
The size member function.
myList.size();
http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html
System.out.println(myList.size());
Since no elements are in the list
output => 0
myList.add("newString"); // use myList.add() to insert elements to the arraylist
System.out.println(myList.size());
Since one element is added to the list
output => 1
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