Spring offers four types of collection configuration elements which are as follows:
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<list>: This helps in wiring i.e. injecting a list of values, allowing duplicates.
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<set>: This helps in wiring a set of values but without any duplicates.
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<map>: This can be used to inject a collection of name-value pairs where name and value can be of any type.
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<props>: This can be used to inject a collection of name-value pairs where the name and value are both Strings.
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