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JAVA (Date & Time (Instant (a point of time in nanosecond, immutable,…

- - - - thread safe
    - - NOT thread safe
- - - - can't be handled
    - - can be handled
        
        checked
        
        SQLException
        
        unchecked
        
        RuntimeException
        
        IOEException
- - - - to simplify writing anonymous classes
    - - only 1 abstract method
      - FunctionalInterface
      - java.util.function
        
        useful functional interfaces to use
        
        Supplier
        
        T get()
        
        Consumer/ BiConsumer
        
        void get (T t) / void get(T t, U u)
        
        Predicate/ BiPredicate
        
        boolean get(T t) / boolean get(T t, U u)
        
        Function/ BiFunction
        
        R get(T t) /R get(T t, U u)