What Are Data Structures And Algorithms In Java?

Data Structures And Algorithms In Java

Data structures and algorithms are integral parts of every computer science career. It is these two components that make up the backbone of computer programming. In this article, you will learn about the data structures and algorithms in Java language.

Here we will start this blog with the fundamentals of data structures and algorithms.

Through algorithms, you make the logic and excess data, then do some manipulations on that data. But students always find it difficult to understand the difference between these two. 

Therefore, in this blog article, we will explain everything you need to know about data structures and algorithms in Java programming.

What are data structures?

Data structures are the well-organized form of data represented in such an order that we can easily perform different operations on it. Because of data structures, we can easily manage the data in different applications. Data structures are further divided into four categories:

  1. Primitive data structures: These are pre-defined data structures of a language used for specific data storage. Example data types in a language.
  1. Non-primitive data structures: These are also known as user-defined data structures in which users will define the internal representation of data. Example: arrays, unions, etc.
  1. Linear data structures: These are the serial or sequential representations of data on which we can easily perform different operations. Example arrays.
  1. Non-linear data structures: In these data structures data will be represented in the hierarchical or graphical form. But it is not easy to implement. Example trees and graphs.

Some Basic Operations on The Data Structures

  1. Creation: Static (compile-time): In this allocation method we have fixed memory allocation at the compile time. But since the user can store less data; therefore, the rest of the memory gets wasted. Therefore, we always prefer dynamic memory allocation. Dynamic: In this method, memory is allocated at the run-time. Therefore there is no wastage of memory. Memory gets created according to the needs of the programmer.
  1. Insertion: It is the operation to insert the new element into the data structures. There are two conditions during insertion that we must check. They are overflow and underflow conditions.
  1. Searching: It is the operation to search the particular element present in the data structures. There are various methods to do it like binary search, linear search etc.
  1. Traversing: The operation to access each element of data structures and apply some operations on them.
  1. Deletion: The operation to delete the existing element.
  1. Merging: Operation to merge two or more data structures.
  1. Sorting: Operation to arrange the given data structures either in ascending or descending order.

What are Algorithms?

The step by step description of all the statements which are represented to solve a particular problem. All the algorithms are language independent, which means we can define them in our language. So that every user can understand them. After that, we can easily implement them in any of the languages.

There are several methods for solving a particular problem. These depend on two major factors:

  1. Time: The total time for execution and compilation of the program.
  2. Space: The total required memory space for the compilation and execution of the program.

Both of these are known as the time-space complexity.

Both these factors are inverse of each other. It means if an algorithm takes more time in compilation, it requires more memory. But if it takes more space then it will take less time to execute. Therefore, in the case of recursion, it takes more space but less time. Whereas in the case of iteration (looping statements), it takes less space but more time.

On the basis of these complexities algorithms are divided into three types:

  1. Best-case-complexities.
  2. Average-case-complexities.
  3. Worst-case-complexities.

Difference Between Data Structures and Algorithms In Java

If you want to get to know about data structures and algorithms in Java, then check the below difference:

  1. Data Structure is concerned with successfully organizing and maintaining data so that we may execute certain operations on the data. Whereas an algorithm is a step-by-step technique to be followed to get the desired result.
  1. To solve a problem, steps of an algorithm can use one or more data structures.
  1. A simple example to understand them both may be: Data structure → cooking pot, Data → ingredients, Algorithm → recipe.
  1. Algorithms are used to understand the logic of any problem. For example, let us consider the case of linear search. 

We will write the algorithm  like:

Step 1: Set a variable i to 0

Step 2: Loop i till the size of data structure (say array)

Step 3: If (arr[i]=searched element) then print “found at i+1”

Step 4: Else print “not present”.


When it comes to data structures and algorithms, Java has a well-defined set of rules that govern how data is represented and accessed. This makes it easy for developers to write code that is both efficient and reliable.

Java’s data structures are based on the concept of objects, which are used to store data in a structured way. Each object has a specific type, and can only be used to store data of that type. For example, an Integer object can only be used to store integer values.

 Objects are stored in memory in a linear fashion, meaning they are arranged in a sequence from first to last. This makes it easy to access data stored in an object, as you can simply move through the sequence until you find the desired object. 

However, it also means that objects must be stored contiguously in memory, which can sometimes lead to wasted space.

Java provides a number of built-in data structures, such as arrays, linked lists, and hash tables. These data structures can be used to store any type of data, and provide different trade-offs in terms of time and space complexity.

Arrays are the simplest form of data structure, and are suitable for storing small amounts of data that need to be accessed quickly. 

Arrays are index-based, meaning each element can be accessed using its numerical index. 

However, this also means that inserting or deleting elements from an array can be slow, as all elements after the insertion point must

Analysis and Design

There are two main aspects to data structures and algorithms in Java: the analysis and design. The analysis phase is all about understanding the problem at hand and devising a plan to solve it. This includes understanding the input and output, any constraints that need to be met, and any special cases that need to be considered.

Once the problem is understood, the next step is to design an algorithm that will solve it. This involves coming up with a step-by-step plan for how the data will be manipulated to achieve the desired result.

The design phase is where much of the creativity comes into play. There is often more than one way to solve a given problem, so it is up to the designer to choose the approach that they feel will be most effective.

Once the algorithm has been designed, it can be implemented in Java (or any other programming language). The implementation phase is where the code is actually written and tested to make sure it works as intended.

Data structures and algorithms are fundamental concepts in computer science, and there are many resources available to help those who want to learn more about them. For example, The Algorithm Design Manual by Steven Skiena is a great resource for those interested in learning more about algorithm design.

Let’s wrap it up!

In today’s article, we discussed data structures and algorithms in Java. We learnt the difference between these two. How the data structure is used within the algorithms to write the best logic. Best logic can be explained based on the complexities of the algorithm. 

Programmers try to write the logic with the least complexity. Like we use a sparse matrix to reduce the time complexity. Therefore, if you still have any queries regarding data structures and algorithms in Java, then let us know. We would like to tell you that we provide the best Data structure algorithm assignment help.