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18 Cards in this Set
- Front
- Back
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What is a general template used to define and create specific instances or objects?
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A Class
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What are contracts for what a class can do, but they say nothing about the way in which the class must do it?
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An Interface
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What is a 100% abstract class, and is implicitly abstract whether you type the abstract modifier in the declaration or not
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An Interface
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What kind of methods can Interfaces have?
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Only abstract, not concrete
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What is a Superclass?
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Classes at the top of the class hierarchy from which all other classes inherit attributes and methods.
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What is a Subclass?
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Also called specific classes, are at the bottom of the class hierarchy.
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What makes a class Concrete?
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Classes with instances.
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What do Abstract classes produce?
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Templates for more specific classes
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Define Polymorphism
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It allows the programmer to treat derived class members just like the parent class members. Process to implement is called Dynamic Binding.
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What is encapsulation
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The message is sent without considering how it will be implemented. All the attributes and methods are hidden from view.
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What is Overriding?
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Overriding lets you define the same operation in different ways for different object types.
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What are some requirements of the overriding methods?
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The Overriding method must have the same argument list, return type and must not have a more restrictive access modifier.
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What is overloading?
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Reusing a method name but with different arguments. It lets you define the same operation in different ways for different data.
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What are some requirements of the overloading methods?
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Overloaded methods must have different argument lists, may have different return types, different access modifiers, throw different exceptions
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What is a benefit of Composition over Inheritance?
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Inheritance relationships make it hard to change the interface of a superclass. Composition provides an approach that yields easier to change code.
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What is a Framework?
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Collection of objects? White box frameworks include visible source code. Easier to build but harder to use than black-box frameworks.
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What is the principle reason behind encapsulation?
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All the attributes and some private methods are hidden behind an interface. A class specifies how to interact with the interfaces for proper instantiation.
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What is the relationship difference between object inheritance and object composition
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You can say that one object that inherits from another has an "is-a" relationship and object in composition have an "has-a" relationship.
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