SCJA-drills-chap06
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| show | Composition and association are both general descriptions for object-to-object relationships.
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| show | A relationship is created when an object contains a reference to another object, often through an instance variable.
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| show | 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.
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| show | Two objects that have a direct association will logically make sense if the relationship is lost.
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| Give four properties of composition association. | show 🗑
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| What happens to objects that have a composition association if the relationship is lost? | show 🗑
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| show | When two objects have a composition association, the containing object often requires the inner object.
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| show | Aggregation association is a “part-of” relationship, is a weak relationship and has no life cycle responsibilities.
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| show | Two objects that have an aggregation association will logically make sense if the relationship is lost.
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| Give three properties of a temporary association. | show 🗑
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| When is a temporary association relationship created? | show 🗑
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| When is a one-to-one relationship possible? | show 🗑
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| show | One-to-one relationships have one object that contains a reference to another object.
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| When are one-to-many relationships possible? | show 🗑
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| show | One-to-many relationships are one object that contains a reference to an array or collection of similar objects.
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| show | Many-to-many relationships are possible only with association.
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| show | Many-to-many relationships have many similar objects that contain a reference to the same array or collection of objects.
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| show | Association navigation is a term used to describe the ability to access an object that is contained in another object.
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| How may relationships be navigated? | show 🗑
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| Which role are getter methods playing in regard to navigation? | show 🗑
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| show | In an association, the inner object normally is not created in the containing object but is instead passed to it as a method argument.
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| show | In a composition, the inner object is normally created in the containing object.
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| Give a characteristic of one-to-many relationships, specific to storage of objects? | show 🗑
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| show | 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.
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