Java Example - Removing Array Elements

Java Examples

Java arrays have a fixed length and cannot be directly deleted. We can achieve this by creating a new array and placing the elements we want to keep from the original array into the new array:

Main.java File

import java.util.Arrays;

public class tutorialproTest {

    public static void main(String[] args) {
        int[] oldarray = new int[] {3, 4, 5, 6, 7}; // Original array
        int num = 2;   // Delete the element at index 2, which is the third element 5
        int[] newArray = new int[oldarray.length-1]; // New array, length is one less than the original array

        for(int i=0; i&lt;newArray.length; i++) {
            // Check if the element is out of bounds
            if (num < 0 || num >= oldarray.length) {
                throw new RuntimeException("Element out of bounds... "); 
            } 
            // 
            if(i&lt;num) {
                newArray[i] = oldarray[i];
            }
            else {
                newArray[i] = oldarray[i+1];
            }
        }
        // Print the array content
        System.out.println(Arrays.toString(oldarray));
        oldarray = newArray;
        System.out.println(Arrays.toString(oldarray));
    }
}

The output of the above code is:

[3, 4, 5, 6, 7]
[3, 4, 6, 7]

We can also use ArrayList to achieve this functionality, as ArrayList is a dynamic array and is more convenient to operate with.

The following example demonstrates how to use the remove() method of ArrayList to delete elements from the array list:

Main.java File

import java.util.ArrayList;

public class Main {
    public static void main(String[] args)  {
        ArrayList<String> objArray = new ArrayList<String>();
        objArray.clear();
        objArray.add(0,"Element 0");
        objArray.add(1,"Element 1");
        objArray.add(2,"Element 2");
        System.out.println("Array before element removal: " + objArray);
        objArray.remove(1);
        objArray.remove("Element 0");
        System.out.println("Array after element removal: " + objArray);
    }
}

The output of the above code is:

Array before element removal: [Element 0, Element 1, Element 2]
Array after element removal: [Element 2]

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