jmgimeno / java-review-2023

Review of some aspects of classic java

(CLASSIC) JAVA ELEMENTS

• Polymorphism vs overloading

  • Compilation / Runtime (execution)
  • Static / Dynamic

• var is not dynamic typing

• Inheritance vs composition

  • extends vs implements
  • Constructor chaining

• Nested classes

  • inner (non-static)
    • qualified this
  • static nested

• Generics

  • Bounds and wildcards
    • Compare to arrays
  • Erasure
    • Reifiable / Non-reifiable types
      • cannot create instance of type parameter
      • cannot create array of parameterized type
      • cannot use instanceof / cast with parameterized type
      • cannot overload with two different instantiations of the same parameterized type
  • Raw-types -> do not use them
  • With nested classes
  • F-bounded polymorphism

More info:

• The Java Tutorials

• Java Magazine

• Inside Java

• Naftalin & Wadler, Java Generics and Collections, Manning, 2006

• Bloch, Effective Java, 3rd ed., Addison-Wesley, 2017

• Evans, Clark, Verburg, The Well-Grounded Java Developer, 2nd ed., Manning, 2022

• Spilka, Troubleshooting Java, Manning, 2023