Set<String> set1 = Stream.of("Kotlin", "Java", "Rust", "Python", "C++").collect(Collectors.toSet());

Set<String> set2 = Stream.of("Kotlin", "Java", "Rust", "Ruby", "C#").collect(Collectors.toSet());

Set<String> expectedOnlyInSet1 = Set.of("Python", "C++");

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set1.removeAll(set2);

//removeAll method can be used to calculate the difference between sets