Describe a schema (or classes) to power an online restaurant reservation system. Describe the tables and the relationships beween the tables.

This system should allow a user to reserve a table at a restaurant for a certain time period and a certain party size.

It should allow the restauranteur to configure the system to describe their restaurant and manage reservations.

Think http://opentable.com

How do you share methods between different parts of your code in Ruby? Can you name three strategies for doing this? Discuss the pros and cons of each.

Suppose you have a web form that allows users to upload JPG, GIF or PNG images. Before you store the images in your system, you want to convert them all to the JPG format. Design an image converter API. Sketch out all classes and interfaces that are involved.

Note: the actual code necessary to convert a JPG image to a GIF image is not the point. Just place a comment at the appropriate location where the actual conversion should occur.

Define the following object oriented concepts:

• Class, object (and the difference between the two)
• Instantiation
• Method (as opposed to, say, a C function)
• Static methods and classes
• Destructor/finalizer
• Inheritance
• Encapsulation
• Multiple inheritance (and give an example)
• Abstract class
• Interface/protocol (and different from abstract class)
• Method overriding
• Method overloading (and difference from overriding)
• Polymorphism (without resorting to examples)
• Method visibility (e.g. public/private/other)

Explain what the following code does:

package Person;
sub new {
    my $self = {
        _firstName => undef,
        _lastName  => undef,
        _ssn       => undef,
        _address   => undef,
        _salary    => undef,
        _dept      => undef
    };
    bless $self, 'Person';
    return $self;
}

sub print {
    my ($self) = @_;
    printf( "Name:%s %s\n\n", $self->firstName, $self->lastName );
}

Explain the difference between method overloading and method overriding

Explain thedifference between this() and super()

Name 3 top level class modifiers.

Explain the difference between an inner class and an anonymous class? When would you use these?

What is an interface in Java? Give and example of where you might use one. How does this compare to inheritance?

Can an inner class be defined inside a method? What variables can be accessed by that class?

Describe a schema (or classes) to power an online car rental system. Describe the tables and the relationships beween the tables.

Model the animal kingdom as a set of classes. Discuss the species, their behavior and properties.

What is an abstract class and when might you use one?

What is a Final class and where might you use one?

Describe the singleton design pattern and how you might use it in practice.

Implement it.

Describe the Factory design pattern and how you might use it in practice.

Implement it.

Describe the Observer design pattern and how you might use it in practice.

Implement it.

Design the schema or the classes to implement a library for building card games with. This library should make it easy to build games like Rummy, Poker, Hearts, Whist etc.

Outline the implementation for two of the most important methods of the Deck class.