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- public, protected, default, private
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- Collection, Set, List, Queue, Deque, Map, SortedSet, SortedMap
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- final field, static final, final method, final class
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- constant field, astract method, default method, static method
- 익명 구현 객체
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- POJO
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- DriverManager
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- Class Loader, Runtime Data Area, Execution Engine
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- Functional Interface, Function, Consumer, Supplier, Predicate, Method Reference
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- Process, Thread, Runnable, Lock, synchronized
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- static field, static method, static initialization block, initializer block
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- Collector
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- String, StringTokenizer, StringBuilder, StringBuffer
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- ExecutorService, Executors, Runnable, Callable, Future