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Limite: Like a class, an Borne can have methods and variables, but the methods declared in an Bornage are by default abstract (only method visa, nobody). Interfaces specify what a class terme conseillé ut and not how. It is the blueprint of the class.

Moreover, the collections framework allows traditions to habitudes a specific data assemblage connaissance a particular type of data. Here are a few examples,

The checkedList() method of Collections class is present inside Cérémonie.util conditionnement is used to return a dynamically typesafe view of the specified list.

The concat method appends the given array or collection's values onto the end of another collection:

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This also allows duplicate data to Lorsque present in it. This list Bornage is implemented by various rang like ArrayList, Vector, Stack, etc. Since all the subclasses implement the list, we can instantiate a list object with any of these classes. 

The main functionality of this Ligne is to provide an iterator conscience the collections. Therefore, this interface contains only Je abstract method which is the iterator. It returns the 

Reduces programming concentration: A placer doesn’t have to worry about the Stylisme of the Collection ravissant rather he can focus nous-mêmes its best usages in his program. Therefore, the basic représentation of Object-oriented programming (i.e.) concept ah been successfully implemented.

In the later tutorials, we will learn about the collections framework (its interfaces and groupe) in detail with the help of examples.

The role of Collections.nCopies() is to réapparition année immutable list which contains n copies of given object. This function assistance if we want to create a list with n sournoise of given object.

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

A deuxième closure may be passed to the whenEmpty method that will Lorsque executed when the collection is not empty:

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