Compare two sets' elements

Question

I have two sets, each one contains Words(String)

Set <String> Set1= words1.keySet();
Set <String> Set2= words2.keySet();

I know the set is unordered , but i want to check if the First 5 elements of the both sets are equal or not , then check the next 5 elements .. etc any one can guide me ..

What do you mean by `first element` of Set? Set is not ordered. — vinS, Dec 18 '17 at 16:32
I know this , i said this as an example. i want to know how many elements in both sets are equals @vinS — Yousef Ahmad, Dec 18 '17 at 16:33
@YousefAhmad you didn't say it's an example; and even so, what are you then looking for? — Andy Turner, Dec 18 '17 at 16:34
Are you perhaps asking about how to find the [intersection of two sets](https://stackoverflow.com/questions/8882097/how-to-calculate-the-intersection-of-two-sets)? — azurefrog, Dec 18 '17 at 16:35
i want to check the elements of both sets , and count how many elements of the sets are equals @AndyTurner — Yousef Ahmad, Dec 18 '17 at 16:38
but this will return Boolean which is not good for me @AndyTurner — Yousef Ahmad, Dec 18 '17 at 16:40

Shubhendu Pramanik · Accepted Answer · 2017-12-18T16:52:03.137

1

Although you should DIY but here's the code:

    int count = 0;
            for(String s : keysDoc1)
            {
                if(keysDoc2.contains(s))
                    count++;
            }
//print count;

EDIT: Alternative approach

Set<String> c = keysDoc1;

        c.retainAll(keysDoc2); //remove uncommon elements from c

        System.out.println(c.size());

edited Dec 18 '17 at 16:52

answered Dec 18 '17 at 16:40

Shubhendu Pramanik

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Compare two sets' elements

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