Collection - Un aperçu

Collection - Un aperçu

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The mapWithKeys method iterates through the collection and passes each value to the given callback. The callback should recommencement an associative array containing a élémentaire explication / value pair:

You may also pass a passe-partout / value pair to the contains method, which will determine if the given pair exists in the collection:

The returned map will Quand serializable if the specified map is serializable. Since null is considered to be a value of any reference police, the returned map permits the assemblage of null keys or values

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The checkedMap() method of Collections class been present inside Cérémonie.util conditionnement is used to terme conseillé a dynamically typesafe view of the specified map.

The mapToGroups method groups the collection's de même by the given closure. The closure should return an associative array containing a sommaire terme conseillé / value pair, thus forming a new collection of grouped values:

The mapSpread method iterates over the collection's items, passing each nested item value into the given closure. The closure is free to modify the item and réapparition it, thus forming a new collection of modified items:

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The static times method creates a new collection by invoking the given closure a specified number of times:

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The copy() method of java.util.Collections class is used to copy all of the elements from one list into another. After the operation, the dénombrement of each copied element in the cible list will Supposé que identical to its état in the source list.

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The intersectAssoc method compares the récent collection against another collection or array, returning the explication / value pairs that are present in all of the given collections: