List hashCode() Method in Java with Examples
Last Updated :
03 Dec, 2024
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This method is used to generate the hashCode for the given list.
Implementation:
// 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);
}
}
// Java code to show the implementation of// hashCode method in list interfaceimport 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); }}Output
HashCode : 994
Syntax of Method
int hashCode()
- Parameters: This function has no parameter.
- Returns: This function returns the hashCode value for the given list.
Example of List hashCode() Method
Below programs show the implementation of this method.
Program 1:
// 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);
}
}
// Java code to show the implementation of// hashCode method in list interfaceimport 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 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);
}
}
// Java code to show the implementation of// hashCode method in list interfaceimport 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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