Here only one object is required for any operation It allows a single null key and there is no limit of null values In case a key is a duplicate, then the new value is swapped with the old key No duplicate keys are allowed here but duplicate values are allowed. ![]() No duplicate values are allowed and so duplicate elements are not allowed. The difference between HashSet and HashMap classes in collection framework is: The compiler handles the methods based on these arguments.Įxplain the difference between HashSet and HashMap classes ? Generic functions can be called with a different type of arguments. The code for creating objects of the generic class is: BaseType obj = new BaseType () Additionally, it removes the need for typecasting objects. With the feature, only a single type of object can be stored. It is used to make the code management process efficient and finding the bugs during compilation time. Generics were introduced in Java to handle type-safe objects. What are Generics in collection framework? Insertion operations are faster here as there is no need for resizing arrays and copying data into new arrays if the array gets full Insertion is slower as its Index has to be updated if a node is inserted anywhere except the end If an element is removed, the bits are moved to the memoryĭata manipulation is faster here as a doubly-linked list is used and no shifting is requiredĪs this class implements the only List, it can work only as a listĪs this class implements both Queue and List interfaces, it can work as a queue and a list This list is better for accessing and storing the dataĭata manipulation is slower here as the internal array is utilized. Here, a doubly-linked list is used for storing the elements. It uses a dynamic array to store elements. The differences between ArrayList and LinkedList classes in collection framework are: Example - List, Set, Queue, Dequeue, SortedSet, and SortedMap are the interfaces in Collection.Įxplain the difference between ArrayList and LinkedList classes? The class implementing an interface in the Collections framework will be able to use them for various functions. In Java, interfaces can have methods and variables but they will be abstract by default and will have no methods body. What are the interfaces in collection framework? The final class can be used to take user input for the various list operations. The other class can be called LinkedList that will be used for the different list operations like insert, delete, or add the node in different positions within the list. For example, in the program, one class can be called Node that will set the data and information about the next node. In Java, a linked list can be created without using the collections framework by using three different classes. How to make a linked list in java without using the collection framework? This code will import the complete collections framework as specified by the * symbol. The Collection framework can be imported in a Java program by using the following code: import .* How to import the collection framework in Java? The Collection framework has a List interface that is implemented by classes such as Vector, ArrayList, Stack, and LinkedList. This interface has different methods like Boolean addAll and Boolean add which can be used by the subclasses. The Collection framework has interfaces like Collection interface that is implemented by the classes in the framework. How does the Collection framework work in Java? Additionally, operations like insertion, sorting, searching and deletion can also be performed. The Collection framework is necessary for Java to reduce the programmer’s effort so that he can focus on the task and not write unnecessary code. Why is the collection framework necessary for Java? Therefore, the Collection framework was introduced to manage these collections with some core interfaces. There was no common interface to operate them and code had to be developed to work with all these collections. ![]() Why is the use of the collection framework in Java?Įarlier, the Java objects were grouped together using HashTables, Arrays, and Vectors. The quality of code is enhanced as the classes have been well tested. ![]()
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