how to add elements to an array in java dynamically

To add elements to an array dynamically in Java, you can use a collection class, such as ArrayList, or create a new array and copy the elements manually.

Here's an example of how you could use an ArrayList to add elements to an array dynamically:

import java.util.ArrayList;
import java.util.Arrays;

public class Main {
  public static void main(String[] args) {
    ArrayList<Integer> list = new ArrayList<>();
    list.add(1);
    list.add(2);
    list.add(3);
    int[] numbers = list.stream().mapToInt(i -> i).toArray();
    System.out.println(Arrays.toString(numbers));
  }
}

In this example, the ArrayList object named list is initialized with three elements using the add method. Then, the stream method is used to create a stream of the elements in the list, and the mapToInt and toArray methods are used to convert the stream to an int array. Finally, the Arrays.toString method is used to print the numbers array as a string.

The output of this example would be the following array:

[1, 2, 3]

Keep in mind that the ArrayList class is part of the java.util package, which is included in the standard Java SE library. You can use a similar approach to add elements to an array dynamically using other collection classes, such as LinkedList, Vector, or Queue.