Java gives a strategy to contrasting two Array List. The ArrayList.equals() is the strategy utilized for contrasting two Array List. It analyzes the Array records as, both Array records ought to have a similar size, and all relating sets of components in the two Array records are equivalent.

Example:

Input : ArrayList1 = [1, 2, 3, 4],
        ArrayList2 = [1, 2, 3, 4]
Output: Array List are equal

Input : ArrayList1 = [1, 2, 3, 4],
        ArrayList2 = [4, 2, 3, 1]
Output: Array List are not equal

Syntax:

boolean equals(Object o)

Parameters: 

// Comparing two ArrayList In Java
import java.util.ArrayList;

public class GFG {
	public static void main(String[] args)
	{

		// create two Array List
		ArrayList ArrayList1
			= new ArrayList();
		ArrayList ArrayList2
			= new ArrayList();

		// insert items in AyyarList 1
		ArrayList1.add("item 1");
		ArrayList1.add("item 2");
		ArrayList1.add("item 3");
		ArrayList1.add("item 4");

		// insert items in AyyarList 2
		ArrayList2.add("item 1");
		ArrayList2.add("item 2");
		ArrayList2.add("item 3");
		ArrayList2.add("item 4");

		// Display both ArrayList
		System.out.println(" ArrayList1 = " + ArrayList2);
		System.out.println(" ArrayList1 = " + ArrayList1);

		// compare ArrayList1 with ArrayList2
		if (ArrayList1.equals(ArrayList2) == true) {
			System.out.println(" Array List are equal");
		}
		else
		// else block execute when
		// ArrayList are not equal
		{
			System.out.println(" Array List are not equal");
		}

		// insert one more item in ArrayList 1
		System.out.println(
			"\n Lets insert one more item in Array List 1");
		ArrayList1.add("item 5");

		// display both ArrayList
		System.out.println(" ArrayList1 = " + ArrayList1);
		System.out.println(" ArrayList = " + ArrayList2);

		// again compare ArrayList 1 with ArrayList 2
		if (ArrayList1.equals(ArrayList2) == true) {
			System.out.println(" Array List are equal");
		}
		else {
			System.out.println(" Array List are not equal");
		}
	}
}

Output:

 ArrayList1 = [item 1, item 2, item 3, item 4]
 ArrayList1 = [item 1, item 2, item 3, item 4]
 Array List are equal

 Lets insert one more item in Array List 1
 ArrayList1 = [item 1, item 2, item 3, item 4, item 5]
 ArrayList = [item 1, item 2, item 3, item 4]
 Array List are not equal

Time Complexity: O(N), where N is the length of the Array list.