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SCJA-drills-chap06

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What are composition and association? Composition and association are both general descriptions for object-to-object relationships.
What happens when a relationship is created, object-oriented-wise? A relationship is created when an object contains a reference to another object, often through an instance variable.
Give four properties of a direct association. Direct association is a “has-a” relationship, is a weak relationship, has no life cycle responsibilities and tends to be the default relationship if no other relationshipseems to fit.
What happens to objects that have a direct association if the relationship is lost? Two objects that have a direct association will logically make sense if the relationship is lost.
Give four properties of composition association. Composition association is a “composed-of” relationship, is a strong association, has life cycle responsibilities and represents possession and ownership.
What happens to objects that have a composition association if the relationship is lost? Two objects that have a composition association will not logically make sense if the association is lost.
What is the inner/container relationship between objects related by a composition association? When two objects have a composition association, the containing object often requires the inner object.
Give three properties of an aggregation association. Aggregation association is a “part-of” relationship, is a weak relationship and has no life cycle responsibilities.
What happens to objects that have a aggregation association if the relationship is lost? Two objects that have an aggregation association will logically make sense if the relationship is lost.
Give three properties of a temporary association. Temporary association is also known as a dependency, is a weak relationship and has no life cycle responsibilities.
When is a temporary association relationship created? A temporary association relationship is created when a return value, method parameter, or local variable is used.
When is a one-to-one relationship possible? One-to-one relationships are possible with both composition and association.
What is particular to one-to-one relationships, in regard to references? One-to-one relationships have one object that contains a reference to another object.
When are one-to-many relationships possible? One-to-many relationships are possible with both composition and association.
What is particular to one-to-many relationships, in regard to references? One-to-many relationships are one object that contains a reference to an array or collection of similar objects.
When are many-to-many relationships possible? Many-to-many relationships are possible only with association.
What is particular to many-to-many relationships, in regard to references? Many-to-many relationships have many similar objects that contain a reference to the same array or collection of objects.
Define asssociation navigation. Association navigation is a term used to describe the ability to access an object that is contained in another object.
How may relationships be navigated? Relationships may be able to navigate bidirectional or unidirectional.
Which role are getter methods playing in regard to navigation? Getter methods are often used to navigate an inner object.
Give a characteristic of association, specific to object creation/passed? In an association, the inner object normally is not created in the containing object but is instead passed to it as a method argument.
Give a characteristic of compostion, specific to object creation/passed? In a composition, the inner object is normally created in the containing object.
Give a characteristic of one-to-many relationships, specific to storage of objects? In a one-to-many relationship, the inner object is stored in an array or collection.
Give two special characteristic of many-to-many relationships, in regard to references. A many-to-many relationship is when objects in an array or collection each contain a reference to another array or collection. Can only exist for associations.
Created by: fd99
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