Map.get() in Java

​The Map.get() method in Java retrieves the value associated with a specific key in a map. If the key does not exist, it returns null. The return type of get() depends on the type of values stored in the map.

Example 1: Integer as Value Type

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", 10);
        map.put("B", 20);

        System.out.println(map.get("A")); // Output: 10
        System.out.println(map.get("C")); // Output: null
    }
}

In this example, the return type of get() is Integer because the map stores integers as values.

Example 2: String as Value Type

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

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

        System.out.println(map.get(1)); // Output: One
        System.out.println(map.get(3)); // Output: null
    }
}

Here, the return type of get() is String since the map stores strings as values.

Key Considerations