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List hashCode() Method in Java with Examples

List hashCode() Method in Java with Examples

Last Updated : 03 Dec, 2024

This method is used to generate the hashCode for the given list.

Implementation:

Java 
// Java code to show the implementation of
// hashCode method in list interface
import java.util.*;

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

        // Initializing a list
        List<Integer> l = new ArrayList<>();
        
      	// Adding Element
      	l.add(1);
        l.add(2);
      
      	// Implement hashCode() Method
        int h = l.hashCode();

        System.out.println("HashCode for List : " + h);
    }
}
Syntax of Method

int hashCode()

Example of List hashCode() Method

Below programs show the implementation of this method.

Program 1:

Java 
// Java code to show the implementation of
// hashCode method in list interface
import java.util.*;

public class Main 
{
  	public static void main(String[] args)
    {
        // Initializing a list of type Linkedlist
        List<Integer> l = new LinkedList<>();
        l.add(10);
        l.add(15);
        l.add(20);
      
        System.out.println(l);

      	// Implementing hashCode() Method
        int h = l.hashCode();

        System.out.println("HashCode of List : " + h);
    }
}

Output 
[10, 15, 20]
HashCode of List : 39886

Program 2: Below is the code to show implementation of list.hashCode() using Linkedlist.

Java 
// Java code to show the implementation of
// hashCode method in list interface
import java.util.*;

public class Main 
{
    public static void main(String[] args)
    {
        // Initializing a list of type Linkedlist
        List<String> l = new LinkedList<>();
        l.add("10");
        l.add("15");
        l.add("20");
      
        System.out.println(l);

      	// Implemented hashCode() Method
        int h = l.hashCode();

        System.out.println("HashCode of List : " + h);
    }
}

Output 
[10, 15, 20]
HashCode of List : 1586008

Reference: Oracle Docs


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