What is the AbstractMap entrySet() method in Java?

Overview

We use the entrySet() method of the AbstractMap class to get the view of the key-value pairs (mappings) contained in the abstract map.

Method

public abstract Set<Entry<K,V>> entrySet();

Parameters

The method has no parameters.

Return value

The method returns a set view of the mappings in the map.

Example

import java.util.*;
public class Main{
  public static void main(String[] args) {
        AbstractMap<String, String> abstractMap = new HashMap<>();
        abstractMap.put("hello-1", "Educative");
        abstractMap.put("hello-2", "edpresso");
        abstractMap.put("hello-3", "answers");
        System.out.println(abstractMap.entrySet());
    }
}

Explanation

  • Line 5: An abstract map is defined. The abstract map has the implementation of the hash map.
  • Lines 6–8: Add entries to the map using the put() method.
  • Line 9: Obtain the map’s entries by invoking the entrySet() method and print the result.

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