Array_List.java

//Basic operations of ARRAY LIST
package arrays;
import java.util.ArrayList;
public class Array_List {
    public static void main(String[] args) {
        ArrayList<Integer> arr = new ArrayList<>(2);
        arr.add(0, 20);
        arr.add(1, 30);                                                                                            // Created an Array list [20, 30]
    System.out.print("Elements of the array list are: ");
      for(int i=0; i<arr.size(); i++){
      System.out.print(arr.get(i)+" ");                                                                                          // Printing the elements of the array list
      }
    System.out.println(" & Size of the array list is: "+arr.size());                                                             // Size of array list
    System.out.println("Modyfying the 0th element(20->40)");
        arr.set(0, 40);                                                                                            // modify/changing the 0th element
    System.out.println("New array list is: "+arr+" & the size of the array list is: "+arr.size());                               // printing the modified value & size of array list
    System.out.println("Adding a new element(50)");
        arr.add(50);                                                                                                           // adding a new element(push) & automatically increased the size of the array list(3)
    System.out.println("New array list after adding a new element: "+arr+" & the new size of the array list is: "+arr.size());   // printing the array list & size of array list
        arr.remove(1);                                                                                                     // Removing the 1th element & so the size will decrease from 3 to 2    
    System.out.println("New array list after removing 1th element: "+arr+" & the new size of the array list is: "+arr.size());   // printing the final array list & size of array list
    }
}