Classes and Interfaces

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# Classes and Interfaces Revisited

- information hiding, packages and accessibility
- interfaces revisited
- static classes
- nested classes
- lambda and method references

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# Method References

| Kind	| Example
|-------|--------
|Reference to a static method	| `ContainingClass::staticMethodName`
|Reference to an instance method of a particular object	| `containingObject::instanceMethodName`
| Reference to an instance method of an arbitrary object of a particular type	| `ContainingType::methodName`
| Reference to a constructor	| `ClassName::new`