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Last active December 12, 2016 10:05
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JavaInTheory.md

JavaInTheory

Static and dynamic binding

  • Static binding happens at compile-time, dynamic binding at runtime.
  • Binding of private, static and final methods always happen at compile time since these methods cannot be overridden. Binding of overridden methods happen at runtime.
  • Java uses static binding for overloaded methods and dynamic binding for overridden methods.

Mix

  • Enum constructor without access modifier specified has private access.
  • Switch clause cannot have null value. Brings NPE.
  • Annotations can have just types : String, another anottations, primitive types, Enums, Class and arrays of types already mentioned.
  • ThreadLocal enables you to create variables that can only be read and written by the same thread. usages
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