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HashMap entrySet() Method in Java

Last Updated : 06 Aug, 2025

The entrySet() method of the HashMap class in Java is used to create a set view of the mappings contained in the HashMap. This method allows us to iterate over the key-value pairs in the map or convert them into a set.

Example 1: Here, we will use the entrySet() method to view the mappings in a HashMap.

// Java Program to demonstrate the entrySet() method
import java.util.*;

public class GFG {
    public static void main(String[] args) {

        // Creating an empty HashMap
        HashMap<Integer, String> hm = new HashMap<>();

        // Mapping string values to integer keys
        hm.put(10, "Geeks");
        hm.put(15, "for");
        hm.put(20, "Geeks");
        hm.put(25, "Welcomes");
        hm.put(30, "You");

        // Displaying the HashMap
        System.out.println("Initial Mappings: " + hm);

        // Using entrySet() to get the set view
        System.out.println("The set is: " + hm.entrySet());
    }
}

Initial Mappings: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=for}
The set is: [20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=for]

Explanation: In the above example, the entrySet() method provides a Set view of the mappings in the HashMap. Each element in the set is a Map.Entry object that represents a key-value pair.

public Set<Map.Entry<K, V>> entrySet()

• Parameters: The method does not take any parameter.
• Return Value: The method returns a set having same elements as the hash map.

Example 2: Here, we will use the entrySet() method with a HashMap having String keys and Integer values.

// Using entrySet() method with a HashMap 
// having String keys and Integer values
import java.util.*;

public class GFG {
    public static void main(String[] args) {

        // Creating an empty HashMap
        HashMap<String, Integer> hm = new HashMap<>();

        // Mapping integer values to string keys
        hm.put("Geeks", 10);
        hm.put("for", 15);
        hm.put("Geeks", 20); // Overwriting the value for key "Geeks"
        hm.put("Welcomes", 25);
        hm.put("You", 30);

        // Displaying the HashMap
        System.out.println("Initial Mappings: " + hm);

        // Using entrySet() to get the set view
        System.out.println("The set is: " + hm.entrySet());
    }
}

Initial Mappings: {Geeks=20, for=15, You=30, Welcomes=25}
The set is: [Geeks=20, for=15, You=30, Welcomes=25]

Explanation: In the above example, the key "Geeks" is updated with the latest value 20. The entrySet() method displays all key-value pairs as a Set.

Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.

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