Hello readers, in this tutorial, we will learn two different ways to remove an element from an array.So lets talk about java array remove operation.
You can watch the following video and learn how to use arrays in Java:
1. Introduction
In Java programming,Arrays represent an index-based object that consists of the same data type elements. The array elements are stored in a common memory location and can store only a fixed number of elements.Arrays offer,
- Code Optimization
- Random Access
To start with the tutorial, we are hoping that users at present have their preferred Ide installed on their machines. For easy usage, I am using Eclipse Ide on a Windows operating system.
2. Remove element from an Array Java Example
In this example, I’ll demonstrate two ways fordeleting an element from an array. For a better understanding, developers can execute the below code in Eclipse Ide.
2.1 Old Style of Working
Approach 1 talks about a mature way of deleting an element from an array. Let us understand this with the help of a simple code snippet.
Example 1
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | packagecom.java;publicclassOldWayOfDoingThings { publicstaticvoidmain(String[] args) { // Initializing a sample array. int[] arr =newint[] {5,10,15,20,25,30}; // New array for copying elements from old array. // For simplicity we are decrementing the old array length by 1 and assigning it to the new array. int[] newArr =newint[arr.length -1]; System.out.println("Original array values: "); for(inti=0; i<arr.length; i++) { System.out.print(arr[i] +" "); } System.out.println("\n"); // Removing the element from index=2 -> (value=15). intremoveEleFromIndex =2; // Copying the elements to the new array except the index from the original array. for(intj=0, k=0; j<arr.length; j++) { if(j == removeEleFromIndex) continue; newArr[k++] = arr[j]; } System.out.println("After removing an element from the given index: "); for(intl=0; l<newArr.length; l++) { System.out.print(newArr[l] +" "); } }} |
If everything goes well, the element present atindex=2 will be removed from the specified array.To find out more about the best way to copy an array for each possible case you can check theJava Copy Array Example
Output
1 2 3 4 5 | Original array values:5 10 15 20 25 30After removing an element from the given index:5 10 20 25 30 |
2.2 New Style of Working
Approach 2 talks about the use ofcommon-lang3 to perform a remove operation on an array. To use this approach ensure having thecommons-lang3 dependency in your project. Let us understand this with the help of a simple code snippet.
Example 2
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | packagecom.java;importjava.util.Arrays;importorg.apache.commons.lang3.ArrayUtils;publicclassNewWayOfDoingThings { publicstaticvoidmain(String[] args) { // Initializing a sample array. int[] arr =newint[] {35,40,45,50,55,60}; System.out.println("Original array values: "+ Arrays.toString(arr)); System.out.println("\n"); // Removing the element from index=2 -> (value=45). // Where "2" refer to the index position. arr = ArrayUtils.remove(arr,2); System.out.println("After removing an element from the given index: "+ Arrays.toString(arr)); }} |
If everything goes well, the element present atindex=2 will be removed from the specified array.
Output
1 2 3 | Original array values: [35, 40, 45, 50, 55, 60]After removing an element from the given index: [35, 40, 50, 55, 60] |
That is all for this tutorial and I hope the article served you whatever you were looking for. Happy Learning and do not forget to share!
3. Conclusion
In this tutorial, we learned how to remove an element from a given array. Developers can download the sample application as an Eclipse project in theDownloads section.
4. Download the Eclipse Project
This was an example of removing an element from a given array.
You can download the full source code of this example here:Remove element from an Array Java Example
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