Explore the Different Sorting Algorithms in Java

Sorting is one of the fundamental operations we carry out on objects. Children are taught to sort even as young children in order to help them grow as thinkers. Software and computers are not an exception. Working with several instances of the same data types will be a common difficulty once you start learning to program. Typically, these data will use arrays to store them. The most crucial query is: How can the answer to a certain problem be optimized to fit within a given period of time? The broad solution is to arrange the array’s elements to preserve order. This is the sorting procedure, which is utilized in many computer programming languages like Java. In this blog post of Java Homework Help, we will talk about the most commonly used and extensively applied sorting algorithms in Java, as well as their temporal complexity.

But first, let’s talk about what is sorting algorithms.

What is a Sorting Algorithm?

Rearranging an array or list of elements according to a comparison operator on the elements is done using a sorting algorithm. The new order of the elements in the relevant data structure is determined using the comparison operator. Additionally, a decent sorting algorithm must guarantee that elements with the same value don’t move around in the sorted array. Gaining a practical understanding of data structures and algorithms requires sorting.

For example, consider an array A = {A1, A2, A3, A4, ?? An }, the array is called to be in ascending order if elements of A are arranged like A1 > A2 > A3 > A4 > A5 > ? > An.

A few popular ordering criteria include sorting numbers from least to largest or vice versa and lexicographically sorting strings.

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Different Sorting Algorithms in Java

The functioning of numerous sorting algorithms is supported by the flexibility of the Java language itself. However, the majority of these methods are themselves very adaptable and may be applied both iteratively and recursively.

Java has a broad selection of sorting algorithms. Read below to learn more about them and how they function. If need any assistance, you can take Java Assignment Help Online as well from experts.

Selection Sort

A selection sort, often known as an in-place comparison sort, is a simple sorting algorithm. It works by repeatedly choosing the smallest element and placing it in the appropriate position in the sorted order. However, the selection sort looks for the smallest element in each iteration to add the smallest element from the unsorted sublist to the end of the sorted sublist.

Furthermore, there are two loops used in the selection sort. The first inner loop selects the array’s smallest element and moves it to the proper index, which is indicated by the outer loop. One element is moved to the appropriate spot in the array for each iteration of the outer loop.

Process of Selection Sorting Algorithm in Java

  • Begin
  • Running an inner and an outer loop consists of two loops.
  • Keep going through the stages till the bare minimum is found.
  • Create a minimum for the element that is already selected by the outer loop variable.
  • Change the value of the designated minimum element to the current element if the current element in the inner loop is less than the minimum element.
  • Change the value of the element designated by the outer loop variable to that of the element with the minimum value.
  • END

Bubble Sort

Bubble sort, also known as sinking sort, is a straightforward sorting algorithm that works by continually going through the list to be sorted, evaluating each pair of nearby items, and swapping them if they are out of order. The list is traversed repeatedly until no swaps are required, at which point the list is considered sorted. The algorithm’s name refers to the manner that smaller pieces “bubble” to the top of the list. It is a comparison sort since it solely utilizes comparisons to operate on components. However, the procedure is straightforward, most alternative sorting techniques are more effective for huge lists.

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Algorithm Process in Bubble Sort

  • The inner loop and the outer loop should be run twice.
  • Steps should be repeated till the outer loop is finished.
  • Swap the values of the two items in the inner loop if the current element’s size is less than the one after it.
  • END

Merge Sort

Now, we will discuss the merge sort Algorithm. The sorting method that uses the divide and conquers strategy is called merge sort. Since merge sort sorts the components using a divide-and-conquer strategy, it is comparable to the rapid sort algorithm. It is among the most widely used and effective sorting algorithms in Java. It separates the supplied list into two equally sized halves, calls for each of the two halves, and then joins the two sorted halves. To conduct the merging, the merge() function must be defined.

Furthermore, it is also a stable sort, which means that it won’t alter the relative positions of the initial elements in an array. The fundamental technique divides the array into numerous smaller parts until only segments with two items (or one element) remain. Now that the segments have been sorted, they are combined to create larger segments. This procedure is repeated until the full array has been sorted.

Let’s See the Algorithm of Merge Sort

The merge sort technique can be used in three steps. Divide, rule, and unite.

  • The first phase in the divide-and-conquer strategy is to divide. The first step divides the whole list into two more manageable sections.
  • Furthermore, the second phase of merge sort is a recursive loop that deals with the members of the list being sorted in a particular order. In this case, an ascending order sort is used for the original array.

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Insertion Sort

The underlying idea behind insertion sort is that one element from the input elements must be consumed during each cycle in order to establish where it belongs in the sorted array. Each new element must be added to the sorted subarray to its left, in the appropriate spot. Consider each new position as a brand-new card that the dealer has dealt you.

It isn’t the most highly efficient technique for sorting an array, but it is one of the simpler ones. Implementation is also really simple. One selects an element and views it as the key while doing an insertion sort. The key is relocated to its proper spot in the array if it is smaller than its predecessor.

Steps to Perform Insertion Sorting Algorithm in Java

  • Initiate
  • Till the array end is reached, repeat steps 2 through 4.
  • Comparing the element at index I with the one before it Replicates step 3 if it is smaller.
  • Till the key’s precise placement is discovered, keep moving elements from the array’s “sorted” part.
  • Increment the loop variable.
  • Stop

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Quick Sort

The cornerstone of quick sort is the divide-and-conquer strategy. In order to do this, one member of the array must be chosen as the pivot element, and the array must be divided so that all elements smaller than the pivot element are on the left side of the pivot. The right side of the screen contains everything greater than the pivot.

Moreover, the primary action in quicksort is the partition() method. When given an array and element “p” of the array as a pivot, the objective of partitioning is to place all elements smaller than element “p” before “p” and all elements greater than “p” after “p” in a sorted array. Everything should be finished in a straight line.

Quick Sort Implementation Procedures in Java

  • Select the pivot element from the list. In most cases, the pivot can be the middle index component.
  • Rearrange the elements in the list so that all items with values lower than the pivot appear before it and all items with values higher than the pivot appear after it (equal values can go either way). The pivot is in its final position following this partitioning. The partition operation is what we refer to as.
  • Repeat steps one and two for the sub-list of elements with smaller values and for the sub-list of elements with larger values, respectively.

The optimal approach for small inputs is quicksort as opposed to merging sort. If you don’t want a consistent sort and average performance is more crucial than worst performance, use quicksort. Furthermore, you can also take JavaScript homework help for assistance with sorting algorithms in the javascript programming language.

Also Read: How to Handle Java Assignments Efficiently?


Q: What is Shuttle Sort Algorithm?
A: Similar to the Bubble Sort, the Shuttle Sort compares the numbers during each pass through the numbers. It differs in that we must swap them, as seen in the table below by the dashes. Next, we make a comparison between the smallest of this pair and the number before it, swapping as necessary.
Q: What is the best sorting algorithm for Java?
A: Quick sort, which sorts in O(n log n) comparisons, is the most efficient sort algorithm. Quick sort also uses a divide and conquer strategy, just as Merge sort.

By Mark Watson

Mark Watson is a professional java programmer working with top MNC based out in the US. Mark watson likes to help students with java programming and with years of experience, he has been top rated java expert on our platform.