How to put values ​​from an array into a HashSet?

Question

Java

I am writing a test that checks that there are no repeated numbers in the strings of the int [][] array. For this purpose, I want to put the values ​​of the strings in the HashSet and compare the length of the string and the resulting set.
But the compiler does not want to accept int, but requires Integer. Tell me how to be?

Answer 1

you can't put primitives in collections.