OOP – Encapsulation – Q&A

Posted on March 13, 2022 by Administrator Posted in A Level Concepts, A Level Quiz, Computer Science, Computing Concepts, Question & Answer

Question 1[2 marks]

class Padlock:
  private key
  private locked
  
  //Constructor for the Padlock class:
  procedure new(str_key,bool_locked):
    key = str_key       
    locked = bool_locked  
    
  public function unlock(combination):
    if combination==key:
       locked = False
       return True
    else:
      return False
      
  public procedure lock():
    locked = True
    
  public function getKey():
    return key
    
  public function setKey(combination):
    if length(combination)==4:
      key = combination
      return True
    else:
      return False

class Padlock:

private key

private locked

//Constructor for the Padlock class:

procedure new(str_key,bool_locked):

key = str_key

locked = bool_locked

public function unlock(combination):

if combination==key:

locked = False

return True

else:

return False

public procedure lock():

locked = True

public function getKey():

return key

public function setKey(combination):

if length(combination)==4:

key = combination

return True

else:

return False

What code would you write to instantiate two new padlocks: One called bikeLock that is already locked with a combination of 4321 and one called gardenShedLock that is unlocked with a combination of 1234?

Question 2[4 marks]

Explain using an example from the above code for the Padlock class, what is meant by encapsulation.

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