Top 5 Java Programming Data Structures you should know


Here are the top 5 best Java Programming Data Structures that you should know before coding a Java Project

Java programming language is expressly designed for using the distributed environment of the Internet. We can say Java is an upgraded version of C++ as has a similar look and feel, but it also worth knowing that Java is simpler to use than C++ and enforces an object-oriented programming model.

Mainly Java is used to develop complete applications that may run on a single computer or be distributed among servers and clients in a network. Some of the developers and companies also use Java to build a small application module or applet (a simply designed, small application) for use as part of a Web page. Applets make it possible for a Web page user to interact with the page.

If you are a programmer then you must be knowing the importance of Data Structures in programming, likewise, a data structure in Java is a data organization, management, and storage format that enables efficient access and modification. More precisely we can say that a data structure is a collection of data values, the relationships among them, and the functions or operations that can be applied to the data.

Ultimately, Data structures serve as the basis for abstract data types (ADT). The ADT defines the logical form of the data type. The data structure implements the physical form of the data type. Different types of data structures are suited to different kinds of applications, and some are highly specialized to specific tasks. For example, relational databases commonly use B-tree indexes for data retrieval, while compiler implementations usually use hash tables to look up identifiers.

After reading the above explanation I assume that you know what are Data Structures and how you can use them in java. So now below are the Top 5 Data Structures that are used in Java Programming and can be used for developing Java Projects.

Top 5 Java Programming Data Structures:

  1. Array
  2. Linked List
  3. Stack
  4. Queue
  5. Hash table


Top 5 Java Programming Data Structures you should know

An array is a number of elements in a specific order, typically all of the same type (depending on the language, individual elements may either all be forced to be the same type, or maybe of almost any type). Elements are accessed using an integer index to specify which element is required. Typical implementations allocate contiguous memory words for the elements of arrays (but this is not always a necessity). Arrays may be fixed-length or resizable.

Linked List

Top 5 Java Programming Data Structures you should know

A linked list (also just called list) is a linear collection of data elements of any type, called nodes, where each node has itself a value and points to the next node in the linked list. The principal advantage of a linked list over an array is that values can always be efficiently inserted and removed without relocating the rest of the list. Certain other operations, such as random access to a certain element, are however slower on lists than on arrays.


Top 5 Java Programming Data Structures you should know

Java Collection framework provides a Stack class that models and implements a Stack data structure. The stack is a subclass of Vector that implements a standard last-in, first-out stack. Stack only defines the default constructor, which creates an empty stack. The stack includes all the methods defined by Vector and adds several of its own.


Top 5 Java Programming Data Structures you should know

The queue interface is provided in java. util package and it implements the Collection interface. The queue implements FIFO i.e. First In First Out. This means that the elements entered first are the ones that are deleted first.

Hash table

Java Hashtable class implements a hashtable, which maps keys to values. It inherits Dictionary class and implements the Map interface. A Hashtable is an array of a list. Each list is known as a bucket. The position of the bucket is identified by calling the hashcode() method. A Hashtable contains values based on the key. Java Hashtable class contains unique elements. Java Hashtable class doesn’t allow null key or value. Java Hashtable class is synchronized. The initial default capacity of the Hashtable class is 11 whereas the load factor is 0.75.

These are the basic Data Structures that you should know will developing a Java Project. There are other Data Structures also that can be used in Java programming, for now, these are the top 5 that you should learn. For more news on tech and cybersecurity stay tuned on Android Rookies by subscribing to our newsletter from here.


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