Java 25 (LTS) reference · List and ArrayList Methods

Java List size() Method

Return the number of elements in a list. isEmpty() is a clearer way to check for zero.

Java 25 (LTS) Since Java 1.0

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Syntax

list.size()

Return value

An int.

Examples

Count and clear

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<String> queue = new ArrayList<>(List.of("a", "b"));
        System.out.println(queue.size());
        queue.clear();
        System.out.println(queue.size() + " " + queue.isEmpty());
    }
}

Output

2
0 true

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Numbered output

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<String> names = List.of("Ana", "Ben", "Cleo");
        for (int i = 0; i < names.size(); i++) System.out.println((i + 1) + ". " + names.get(i));
    }
}