9) Discuss the public and private modifiers in context of methods and instance variables.
What will be an ideal response?
The modifiers public and private can both be used with methods and instance variables. Any instance variable can be labeled either public or private. The modifier public means that there are no restrictions on where the instance variable can be used. The modifier private means that the instance variable cannot be accessed by name outside of the class definition.
The modifiers public and private before a method definition have a similar meaning. If the method is labeled public, there are no restrictions on its usage. If the method is labeled private, the method can only be used in the definition of another method of the same class.
Normal good programming practices require that all instance variables be private and typically most methods be public.
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Which of the following methods correctly withdraws an amount from a bank account?
A. Method withdraw(Numeric amt) acctBal = acctBal - amt Display "The new balance is: $" + acctBal End Method B. Method withdraw(String amt) acctBal = acctBal - amt Display "The new balance is: $" + acctBal End Method C. Method withdraw(Numeric amount) acctBal = acctBal - amt Display "The new balance is: $" + acctBal End Method D. Method withdraw(String amount) acctBal = acctBal - amt Display "The new balance is: $" + acctBal End Method
The values used to initialize a structure are enclosed in braces and separated by commas.
Answer the following statement true (T) or false (F)
_________ methods can be called without the need for an object of the class to exist.
a) special b) independent c) static d) dependent