import java.util.List;

import java.util.ArrayList;

import java.util.Collections;

public class TestArrayList {

public static void main (String[] args) {

int a1 = 3, a2 = 5, a3 = 7;

ArrayList<Integer> arr = new ArrayList<Integer>();

arr.add(a1);

arr.add(a2);

arr.add(a3);

System.out.println("Array size = " + arr.size());

for (int a : arr)

{

System.out.print(a + " ");

}

System.out.println("");

for (int i = 0; i < arr.size(); ++i) {

System.out.print(arr.get(i) + " ");

}

System.out.println("");

Collections.reverse(arr);

System.out.println("After reversing the original arraylist: ");

for (int a : arr)

{

System.out.print(a + " ");

}

System.out.println("");

System.out.println("arr contains a1 ? " + arr.contains(3));

System.out.println("Index of a1 : " + arr.indexOf(a1));

List<Integer> arrClone = new ArrayList<>(arr); //shallow copy

System.out.println("arrClone:");

System.out.println(arrClone);

List<Object> objectArray = new ArrayList<>();

objectArray.add(new Cat(1, 2, 3));

objectArray.add(new Animal());

objectArray.add(new Person("Allen", 23));

System.out.println(objectArray);

}

}