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Java 8 (Functional Interfaces (1.Predicate (test() (check an condition+…

- - - - check an condition+ return boolean value
  - - - rep a function + one arg + return value
  - - - rep an operation + one arg + return void
  - - - rep a supplier of result
- - - - If object ==null -> NullPointer Exception
    - - If ọbj != null then return Optional.of(obj)
        If obj ==null then return Optional.empty(obj)
    - - Return an empty Optional object
  - - - return the value of Optional if present or by supplier
    - - if Optional not empty then invokce the Consumer
    - - if value matches the Predicate, return the Optional, otherwise return an empty Optional