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→Architecture: iterator() is a method spécified by java.lang.Iterable, java.lang.Iterator spécifies the methods needed to iterate |
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{{Javadoc|module=java.base|package=java.util|class=Collection|member=contains(E)|text=contains(E e)|monotype=y}} method checks if a specified element exists in the <code>Collection</code>.
The <code>Collection</code> interface is a subinterface of '''{{Javadoc|module=java.base|package=java.lang|class=Iterable|monotype=y}}''', so any <code>Collection</code> may be the target of a [[Foreach loop|for-each]] statement. (The <code>Iterable</code> interface provides the {{Javadoc|module=java.base|package=java.util|class=Iterable|member=iterator()|text=iterator()|monotype=y}} method used by for-each statements.) All <code>Collection</code>s
<code>Collection</code> is generic. Any <code>Collection</code> can store any {{code|Object}}. For example, any implementation of {{code|Collection<String>}} contains {{code|String}} objects. No casting is required when using the {{code|String}} objects from an implementation of <code>Collection<String></code>.<ref>{{cite web|url=http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html |title=Iterable (Java Platform SE 7 ) |publisher=Docs.oracle.com |date=2013-06-06 |access-date=2013-08-16}}</ref> Note that the angled brackets {{code|< >}} can hold a type argument that specifies which type the <code>Collection</code> holds.{{sfn|Bloch|2018|loc=Chapter §5 Item 26: Don't use raw types|pp=117-122}}
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