How can we retrieve the first value of a map in Java?

2 years ago
Liam
1 minute

You can use the values() method of Map to retrieve all the values, then convert them into a stream using the stream() method, and finally use the findFirst() method to get the first value.

Here is the example code:

import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>();
        map.put("A", 1);
        map.put("B", 2);
        map.put("C", 3);

        Integer firstValue = map.values().stream().findFirst().orElse(null);
        System.out.println(firstValue);
    }
}

The output results are:

1
bannerAds