How to find common elements between two arrays in java

This video explains Java code to find common elements between two array. It will be helpful to java developer.
Suppose Array1 is {1,6,8,2,3,12,5}
Array2 is {1,9,3,5,15,21,12}
then common elements are 1,3,12,5
Here also we find how many total common elements are there, as for example there are 4 common elements in the above example.

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what if you have repeating elements.... then it wont work suppose array a {2, 2, 2, 2} and array b {2, 4, 6, 8}