Set models the mathematical set abstraction. The following snippet dumps the contents of c into a newly allocated array of String whose length is identicalĬollection that cannot contain duplicate elements. The more complex formĪllows the caller to provide an array or to choose the runtime type of theĮxample, suppose c is a Collection The following snippet dumpsĪrray of Object whose length is identical The simple form with no arguments creates a new array of Object. TheyĪllow the contents of a Collection to be translated into an array. Method that returns an immutable Set containing only theīridge between collections and older APIs that expect arrays on input. Idiom uses Collections.singleton, which is a static factory Specifically, suppose that you want to remove all of the null elements from a Collection :Ĭ.removeAll(Collections.singleton(null)) Specified element, e from a Collection, c. Only those elements in the target Collection that are also contained inĪddAll, removeAll, and retainAll methods all return true if the target Collection was modified in the processĪ simple example of the power of the bulk operations, consider following idiom
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