How to add items to an array in java dynamically?

Java 8Object Oriented ProgrammingProgramming

Since the size of an array is fixed you cannot add elements to it dynamically. But, if you still want to do it then,

  • Convert the array to ArrayList object.
  • Add the required element to the array list.
  • Convert the Array list to array.

Example

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;
public class AddingItemsDynamically {
   public static void main(String args[]) {
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter the size of the array :: ");
      int size = sc.nextInt();
      String myArray[] = new String[size];
      System.out.println("Enter elements of the array (Strings) :: ");
      for(int i=0; i<size; i++) {
         myArray[i] = sc.next();
      }
      System.out.println(Arrays.toString(myArray));
      ArrayList<String> myList = new ArrayList<String>(Arrays.asList(myArray));
      System.out.println("Enter the element that is to be added:");
      String element = sc.next();
      myList.add(element);
      myArray = myList.toArray(myArray);
      System.out.println(Arrays.toString(myArray));
   }
}

Output

Enter the size of the array ::
3
Enter elements of the array (Strings) ::
Ram
Rahim
Robert
[Ram, Rahim, Robert]
Enter the element that is to be added:
Mahavir
[Ram, Rahim, Robert, Mahavir]
raja
Published on 09-Jan-2018 11:39:56
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