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Mac has asked
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Mac questions
Is it good practice to use AtomicInteger as a substitute for mutable Integer?
Why Liskov Substitution Principle needs the argument to be contravariant?
Can I write validation logic in setter methods?
Marker Annotation vs Marker Interface
HashMap or TreeMap or LinkedHashMap which one is fastest to iterate over?
Mac answers
Why can int/byte/short/long be converted to float/double without typecasting but vice-versa not possible
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