Java Collection hashCode() Method with Examples

by Online Tutorials Library July 22, 2014

Java Collection hashCode() Method

The hashCode() method of Java Collection Interface returns the hash code value for this collection.

Syntax

Parameters

Overrides

This method overrides hashCode in class Object

Return

The hashCode() method returns the hash code value for this collection.

Example 1

  import java.util.ArrayList;  import java.util.Collection;  import java.util.HashSet;  import java.util.List;  public class JavaCollectionHashCodeExample1 {      public static void main(String[] args) {          Collection<Integer> collection = new HashSet<>();          List<Integer> list = new ArrayList<Integer>();          collection.add(5);          collection.add(3);          //returns the hash code          int val=collection.hashCode();          System.out.println(“Hash Code : “+val);      }  }  

Test it Now

Output:

Hash Code : 8

Example 2

  import java.util.ArrayList;  import java.util.Collection;  import java.util.HashSet;  public class JavaCollectionHashCodeExample2 {      public static void main(String[] args) {          Collection<String> collection = new HashSet<>();          collection.add(“Reema”);          collection.add(“Rahul”);          //returns the hash code for the string          int val=collection.hashCode();          System.out.println(“Hash Code : “+val);      }  }  

Test it Now

Output:

Hash Code : 157560278

Next TopicJava Collection

add()addAll()clear()contains()containsAll()equals()hashcode()isempty()iterator java collection java methods java tutorial remove removeall removeif()retainall size()