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subject > representation > abstraction > data abstraction > association > one-way association > one-way association where the multiplicity at the other end is 'one' or 'optional'

one-way association where the multiplicity at the other end is 'one' or 'optional' comparison table

Subject	implement by	is a kind of
one-way association		association
one-way association where the multiplicity at the other end is 'one' or 'optional'	declaring an instance variable of that class in Java	one-way association

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