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Java - compare two ArrayLists

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Created by:

Broncono

466

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

Quick solution:

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firstList.equals(secondList));

Practical examples

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Example 1

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

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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:

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true

Example 2

Edit

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

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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));
    }
}