What is HashMap entrySet() in Java?

Overview

The entrySet function in HashMap is used to form and display a set of HashMap keys and values. HashMap is defined in the util package in Java, so you must import the util package before using the entrySet function, as shown below:

import java.util.*;

The syntax for entrySet is as shown below:

hashmapName.entrySet()

Parameters

The entrySet function takes no mandatory arguments as input.

Return value

The entrySet function returns a set version of HashMap keys and values.

Examples

The example below will help you understand the entrySet function better. We first define a HashMap and enter keys using the put function. Then, we print the set version of the HashMap, using the function entrySet:

import java.util.*;
class HelloWorld {
    public static void main( String args[] ) {
        
        HashMap<String, Integer> hash = new HashMap<String, Integer>();
        hash.put("Samia", 22);
        hash.put("Sana", 21);
        hash.put("Ali", 21);
        System.out.println("Size of Map: " + hash.size());
        System.out.println("Set version of the HashMap: " + hash.entrySet());
    }
}
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