Q2b

Field Variables:

access Type state;

access Type maxItems;

access ArrayList<Type> contents;

Q2c

Constructor :
Safe (int aMaxItems)

initialise: state, contents & maxItems

Q2d

Method :

public Type addToContents(String item)

Q2e

Method :

access ReturnType removeFromContents(String item)

produce appropriate messages

Q2f

Method :

access ReturnType display()

Q2g

Method :

access ReturnType empty()

produce appropriate messages

Q2h

access ReturnType open(String code)

Q2i

access ReturnType  lock(String code)

Q2j

Comments!!!!

Q2k

Test, test and test again!!! Screenshot of testbed results

Field Variables:
access Type userCode

access Type MasterCode

access Type display

access Type open

Q1c

Constructor :

public SafeState()

Q1d Getters & Setters

Methods:

access ReturnType getDisplay()

access ReturnType getisOpen()

Q1e

Method :

access ReturnType open()

change display field

Q1f

Method :

access ReturnType isValidUserCode(String aCode)

4 characters in length - digits only.

Q1g

Method :

access ReturnType lock(String code)

change display field

Q1h

Method :

access ReturnType about()

Q1i

Comments!!!!!

Q1j

Screenshot of testbed results