Java Advanced OOP: Interfaces, JDBC, Threads,
and Collections
UPDATED ACTUAL
Questions and CORRECT Answers
Level
1
Contains service details.
Level
2
Contains partial implementation.
Level
3
Contains
all implementation
details.
Level
4
The main method with access to all data.
Interface
An abstract type used to specify the behavior of
a class; it serves as a 'blueprint of behavior'
containing
static
constants and
abstract
methods.
Total
Abstraction
Achieved because interfaces can only have
abstract methods (no bodies) and variables.
JDK
8
Added Default Methods to add functions without
breaking old code and Static Methods which are
not inherited and called independently.
