oop

Question 1

inheritance

Answer 1

• subclass inherits public attributes and methods from superclass
• can override & extend these public methods wo the need to re-implement these methods in their own classes
• to promote code reuse

Question 2

encapsulation

Answer 2

• bundling of data and methods that act on the data into an object
• prevents inadvertent modification of data by separating the interface of object from its implementation (purpose)

Question 3

polymorphism

Answer 3

• polymorphic classes present the same interface & have a common set of methods which have the same name but exhibit different behaviours at runtime
• to promote code generalisation
  so that instances of polymorphic classes can be handled with the same code without needing conditional handling

Question 4

advantage of encapsulation

Answer 4

• thru keeping public mtds & attributes private, keeps data structure more consistent
• prevent bugs (caused frm syntax errors)

Question 5

advantage of inheritance

Answer 5

less likelihood of bugs when modifying code (bc less code duplication)

Question 6

KW for polymorphism

Answer 6

behave differently

Question 7

how encapsulation achieves data&info hiding in the design

Answer 7

• encapsulation invl restricting access to private attributes using public methods
• thus separating the interface of an object from its implementation