Java Program to Delete an Element from a Specific Position of an Array

Java Program to Delete an Element from a Specific Position of an Array

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In the previous article, we have seen Java Program to Find the Number of Even and Odd Integers in an Array of Integers

In this article we are going to delete element from our desired position in an array.

Java Program to Delete an Element from a Specific Position of an Array

Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.

In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.

Declaration of an array:

dataType[] arrayName; (or)                              //Declaring an array
dataType []arrayName; (or)
dataType arr[];

Instantiation of an Array:

arrayName = new datatype[size];                    //Allocating memory to array

Combining both Statements in One:

dataType[] arrayName = new dataType[size] //Declaring and Instantiating array

Initialization of an Array:

arrayName[index-0]= arrayElement1             //Initializing the array

...

arrayName[index-s]= arrayElementS

Combining all Statements in One:

dataType arrayName[ ]={e1,e2,e3};               //declaration, instantiation and initialization

Approach:

  • Create an array.
  • Display it to the user.
  • Ask the user to enter an index to delete element from.
  • Left rotate all the elements after that index.
  • Print the array.

Program:

import java.util.*;
public class Main
{    
    public static void main(String args[])
    {
        // Creating an array
        int arr[] = {10,30,50,70,90};
        // Displaying the array
        System.out.print("Array : ");
        printArray(arr);
        System.out.print("Enter index to delete : ");
        Scanner scan = new Scanner(System.in);
        int index = scan.nextInt();
        // left rotation
        leftRotation(arr,index);

    }

    // Function to print the array
    static void printArray(int arr[])
    {
        for(int i = 0; i < arr.length ; i++)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
    
    // Function to rotate the array
    public static void leftRotation(int arr[], int index){  
        // For loop to swap elements
        for (int i=index+1; i<arr.length; i++)
        {
            arr[i-1]=arr[i];
        }

        System.out.print("After deletion : ");
        for(int i = 0 ; i <arr.length-1;i++)
        {
            System.out.print(arr[i]+" ");
        }
    }
}


Output:

Array : 10 30 50 70 90 
Enter index to delete : 2
After deletion : 10 30 70 90

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