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Java - compare two ArrayLists

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Created by:
Broncono
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In this article, we would like to show you how to compare two ArrayLists in Java.

Quick solution:

firstList.equals(secondList));

 

Practical examples

Example 1

In this example, we create two identical ArrayLists and use equals() method to compare them.

import java.util.*;

public class Example {

    public static void main(String[] args) {
        List<String> firstList = new ArrayList<>();
        List<String> secondList = new ArrayList<>();

        // add items to the ArrayLists
        firstList.add("1");
        firstList.add("2");
        firstList.add("3");

        secondList.add("1");
        secondList.add("2");
        secondList.add("3");

        // reverse ArrayList
        System.out.println(firstList.equals(secondList));
    }
}

Output:

true

Example 2

In this example, we create two different ArrayLists and use equals() method to compare them.

import java.util.*;

public class Example {

    public static void main(String[] args) {
        List<String> firstList = new ArrayList<>();
        List<String> secondList = new ArrayList<>();

        // add items to the ArrayLists
        firstList.add("1");
        firstList.add("2");
        firstList.add("3");

        secondList.add("4");
        secondList.add("5");
        secondList.add("6");

        // reverse ArrayList
        System.out.println(firstList.equals(secondList));
    }
}

Output:

false

Java Collections - ArrayList

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