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Update countCommon.java #6

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Update countCommon.java #6

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7 changes: 7 additions & 0 deletions chapter-11/countCommon.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
*/

public static int countCommon(List<Integer> list1, List<Integer> list2) {
/*
Set<Integer> set = new HashSet<Integer>(list1);
Iterator<Integer> i = set.iterator();
int count = 0;
Expand All @@ -16,4 +17,10 @@ public static int countCommon(List<Integer> list1, List<Integer> list2) {
}

return count;
*/
Set<Integer> s1 = new HashSet<>(list1);
Set<Integer> s2 = new HashSet<>(list2);
s1.retainAll(s2);

return s1;
}