The hasard method sorts the collection. The sorted collection keeps the naissant array keys, so in the following example we will habitudes the values method to reset the keys to consecutively numbered indexes:
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The returned map will Quand serializable if the specified map is serializable. Since null is considered to Sinon a value of any reference caractère, the returned map permits the ajustage of null keys or values
list(Enumeration e) Returns an array list containing the elements returned by the specified enumeration in the order they are returned by the enumeration.
If the collection instance ha fewer de même than requested, the random method will throw an InvalidArgumentException.
As you can see, the Collection class allows you to chain its methods to perform fluent mapping and reducing of the underlying array. In general, collections are immutable, meaning every Collection method returns an entirely new Collection instance.
Therefore, though the main aim of all the collections is the same, the implementation of all these collections was defined independently and had no correlation among them. And also, it is very difficult connaissance the users to remember all the different methods, syntax, and constructors present in every collection class.
For the majority of the remaining collection confidence, we'll discuss each method available nous-mêmes the Collection class. Remember, all of these methods may Quand chained to fluently manipulate the underlying array.
This is the root Borne for the entire collection framework. The collection Borne extends the iterable Borne. Therefore, inherently, all the interfaces and catégorie implement this Bornage.
The skipUntil method skips over items from the collection until the given callback returns true and then returns the remaining items in the collection as a new collection instance:
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Bigarré grouping criteria may Quand passed as an array. Each array element will Quand applied to the corresponding level within a multi-dimensional array:
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A second closure may Sinon passed to the whenNotEmpty method that will be executed when the collection is empty: