Write a program in Java to implement ArrayList and use the important mrthods like add(), size(),isEmpty() etc

Write a program in Java to implement ArrayList and use the important mrthods like add(), size(),isEmpty() etc

import java.util.ArrayList;
class hunteye {
    public static void main(String[] args) {
      ArrayList obj = new ArrayList();
      // isEmpty() will return true here as obj is empty 
      System.out.println(obj.isEmpty()); // true
      //size() will return 0
       System.out.println(obj.size()); //0
       // adding int
       obj.add(12);
       // adding float
       obj.add(567.123);
       //adding char
       obj.add('$');
       //adding string 
       obj.add("Java is OOPS");
       //printing all element
       System.out.println(obj);
        // isEmpty() will return false here as obj is not empty 
      System.out.println(obj.isEmpty()); // false
     //size() will return 4
       System.out.println(obj.size()); //4
      //contains(12) will return true
      System.out.println(obj.contains(12)); 
      //remove() to remove  element from ArrayList 
      obj.remove(0);// deleting element from 0 Position
      //printing all element
      System.out.println(obj);
    }
}

Output

true
0
[12, 567.123, $, Java is OOPS]
false
4
true
[12, $, Java is OOPS]