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Решение задачи 3 #185

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Решение задачи 3 #185

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32 changes: 32 additions & 0 deletions src/com/school/faang/hashset/задача_3/Solution.java
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Original file line number Diff line number Diff line change
@@ -1,7 +1,39 @@
package com.school.faang.hashset.задача_3;

import java.util.HashSet;
import java.util.Set;

public class Solution {
public static void main(String[] args) {
Set<String> firstUserContacts = Set.of(
"Alisa",
"David",
"Zack",
"Mike",
"Luck"
);

Set<String> secondUserContacts = Set.of(
"Tina",
"Toona",
"Moona",
"Zack",
"Luck"
);

Set<String> mutualContacts = MutualContactsFinder.findMutualContacts(firstUserContacts, secondUserContacts);

System.out.println(mutualContacts.size());
System.out.println(mutualContacts);
}
}

class MutualContactsFinder {
public static HashSet<String> findMutualContacts(Set<String> contacts1, Set<String> contacts2) {
HashSet<String> mutuals = new HashSet<>(contacts1);

mutuals.retainAll(contacts2);

return mutuals;
}
}