Difference Between ArrayList vs. LinkedList in Java

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Main Difference

The key difference between arrayList and linkedlist in java is that in arraylist there is random access to the elements as it operates on the index based data structure whereas in linklist there is no random access to the elements as it does not have indexes to access elements.

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ArrayList vs. LinkedList in Java

Java is an object-oriented programming language that uses both compiler and interpreter. Mostly all software’s are made in Java programming language. Java code can be written on Windows, Linux, and Mac OS. The syntax of C and C++ programming language is quite the same. Java produces browser to run programs that help in making a graphical user interface. Java programming language is in used and trend these days. To write Java code, a programmer needs software development kit (SDK) that includes a compiler, interpreter that is not required in C++. In arraylist, there is random access to the elements as it operates on the index based data structure whereas in linklist there is no random access to the elements as it does not have indexes to access elements. Arraylist there is random access to the elements as it operates on the index based data structure. Arraylist is defined by the collection framework. List is an interface that extends collection interface. ArrayList is a collection of ordered element and elements are added, removed and accessed with the help of an index variable. There are actual data in the data field, and these data fields are connected through the data field. The way data fields are connected is that link field contains the address of data fields. The pointer plays a significant role in this regard; pointer keeps the address of the data field. The array has a fixed sized, and link list does not have fixed sized, in case of array we need to declare the size of the array where in link list it is not necessary to declare the size of link list first. There cannot be any duplicate elements in sets but there can be duplicate elements in list. There are some common methods in list that are index-based get() and set() method. There are also add() method that is used to add elements in the list, and another method removes () that is used to remove elements in the list. We can also say that list is a kind of array that can grow size as we add elements in the list. There is no method to set the range of indexed in a list. There is just a sub list() method that returns sub list from the original list of a specific range. A linked list is a data structure that uses references; each node is referred to another node. Linked list there is a sequence of the element where each node is connected to another node. Each node is given the reference of another node, so it makes a linked list. There are two fields in the linked list that are most important which are data field, and other is link field. The array list is implemented using Arraylist and can be accessed randomly. The dyanamic array is used in arraylist. Java arrayList is used for storing elements abstractionlist class and implements list interface. There are duplicate elements in Java ArrayList; Insertion order can be maintained by Java ArrayList. Java ArrayList is synchronized.

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Comparison Chart

BasisArrayListLinkedlist
MeaningIn arraylist, there is random access to the elements as it operates on the index based data structureIn linklist, there is no random access to the elements as it does not have indexes to access elements.
ExtendsArrayList extents abstarctList classLinkedlist extends AbstarctSequrentail list
ImplementationArraylist implements List interfaceLinkedlist implements queue and deque
AcesssAccess of elements in arraylist is fastAccess of elements in linkedlist is slow

What is ArrayList?

In arraylist, there is random access to the elements as it operates on the index based data structure. Arraylist is defined by the collection framework. The list is an interface that extends the collection interface. ArrayList is a collection of ordered element and elements are added, removed and accessed with the help of an index variable. There cannot be any duplicate elements in sets, but there can be duplicate elements in the list. There are some common methods in list that are index-based get() and set() method. There are also add a () method that is used to add elements in the list, and another method removes () that is used to remove elements in the list. We can also say that list is a kind of array that can grow size as we add elements in the list. There is no method to set the range of indexed in a list. There is just a sub list() method that returns sub list from the original list of a specific range. The array list is implemented using Arraylist and can be accessed randomly. The dyanamic array is used in arraylist. Java arrayList is used for storing elements abstractionlist class and implements list interface. There are duplicate elements in Java ArrayList; Insertion order can be maintained by Java ArrayList. Java ArrayList is synchronized.

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What is LinkedList?

A linked list is a data structure that uses references; each node is referred to another node. Linked list there is a sequence of the element where each node is connected to another node. Each node is given the reference of another node, so it makes a linked list. There are two fields in the linked list that are most important which are data field, and other is link field. There are actual data in the data field, and these data fields are connected through the data field.

The way data fields are connected is that link field contains the address of data fields. The pointer plays a significant role in this regard; pointer keeps the address of the data field. The array has a fixed sized, and link list does not have fixed sized, in case of array we need to declare the size of the array where in link list it is not necessary to declare the size of link list first.

Key Differences

  1. In arraylist, there is random access to the elements as it operates on the index based data structure whereas in linklist there is no random access to the elements as it does not have indexes to access elements.
  2. ArrayList extents abstarctList class whereas Linkedlist extends AbstarctSequrentail list.
  3. Arraylist implements List interface whereas Linkedlist implements queue and deque.
  4. Access of elements in arraylist is fast whereas Access of elements in linkedlist is slow.

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