This was really helpful and I'm looking forward to the next one!

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Learn “Effective Java,” the ultimate Java learning course, more easily and completely. By taking this course, you can improve not only your Java programming knowledge and skills, but also your learning ability.

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Effective Java Complete Guide Part 2

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Effective Java Complete Guide 2

Item 15. Minimize the access level of classes and members.

Item 16. Use accessor methods instead of public fields in public classes.

Item 17. Minimize mutability.

Item 18. Prefer composition over inheritance.

Item 19. Design and document for inheritance, or else prohibit it.

Item 20. Prefer interfaces to abstract classes.

Item 21. Design interfaces considering the implementor.

Item 22. Use interfaces only to define types.

Item 23. Prefer class hierarchies to tagged classes.

Item 24. Prefer static member classes.

Item 25. Limit top-level classes to one per file

Item 26. Don't Use Raw Types.

Item 27. Eliminate unchecked warnings

Item 28. Prefer lists to arrays

Item 29. Prefer Generic Types

Item 30. Prefer Generic Methods

Item 31. Use Bounded Wildcards to Increase API Flexibility

Item 32. Generics and Varargs: Caution.

Item 33. Consider type-safe heterogeneous containers.