What is AbstractMap hashcode() in Java?
Overview
The hashcode() method of the AbstractMap class is used to get the hash code value for the map.
The default hash code of a map is defined to be the sum of the hash codes of each entry in the map’s entrySet view.
Note: Refer to What is the hashCode method in Java? to learn more about hashcode in Java.
Syntax
public int hashCode()
Parameters
The method has no parameters.
Return value
The method returns the hash code value.
Code example
Let’s look at the code below:
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");System.out.println(abstractMap.hashCode());}}
Code explanation
- Line 5: We define an abstract map. The abstract map has the implementation of the hash map.
- Lines 6-7: Entries are added to the map using the
put()method. - Line 9: The hash code of the map is obtained by invoking the
hashCode()method and printed.
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