Term-long Review

Which of the following is NOT an advantage of proper encapsulation?

• Encapsulation helps to enforce constraints

• Encapsulated code uses less memory when executed

• Encapsulation provides a more abstract view of classes

• All of the above are advantages encapsulation provides

_____ helps deal with complexity by hiding unnecessary details.

• Abstraction

• Access modifiers

• Encapsulation

• Privacy screens

private, public, and protected are examples of __________

• Attribute modifiers

• Method modifiers

• Access modifiers

• Static modifiers

Which of these variable assignments is valid?

• int x = 5.7;

• double x = "5";

• char x = "A";

• String x = "5";

If A is a subclass of B, then which of the following is true:

• Objects of type B can be stored in variables of type A

• Objects of type A can be stored in variables of type B

• Both of the above are true

• None of the above is true

To treat an object of type A as an object of type B, this must be true:

• A implements the interface B

• B is a descendant class of A

• Both of the above can be true

• None of the above are true

'Upcasting' a variable is a safe operation that does not require an explicit typecast statement.

• True

• False

Assuming x refers to a SavingsAccount object, what would the result of 'x instanceof BankAccount' be?

• True

• False

• It could be either true or false

Given this class hierarchy, would the following line of code be valid? Insurable i = new Car();

• True

• False

Given this class hierarchy, would the following line of code be valid? DepreciatingInsurable i = new Person();

• True

• False