Java HashSet size() Method with Examples

by Online Tutorials Library July 22, 2022

Java HashSet size() Method

The size() method of Java HashSet class is used to get the number of elements in this HashSet (its cardinality).

Syntax

Following is the declaration of size() method:

Parameter

This method does not accept any parameter.

Returns

The size() method returns the number of elements present in the HashSet.

Exceptions

Compatibility Version

Java 1.2 and above

Example 1

  import java.util.*;  public class HashSetSizeExample1 {  public static void main(String[] args) {  HashSet set=new HashSet();    set.add(“Ravi”);    set.add(“Vijay”);    set.add(“Mohan”);    set.add(“Ajay”);    //Print the HashSet              System.out.println(“HashSet: ” + set);              //Displaying the size of the HashSet              System.out.println(“The size of the set is: ” + set.size());  }  }  

Test it Now

Output:

HashSet: [Vijay, Mohan, Ravi, Ajay]  The size of the set is: 4

Example 2

  import java.util.*;  public class HashSetSizeExample2 {  public static void main(String[] args) {  HashSet  hashSetObject = new HashSet <>();  hashSetObject.add(45);  hashSetObject.add(-67);  hashSetObject.add(98);  int s = hashSetObject.size();    System.out.println(“Size of HashSet is: “+s);     }  }  

Test it Now

Output:

Size of HashSet is: 3

Example 3

  import java.util.*;  public class HashSetSizeExample3 {  public static void main(String[] args) {  //Get the HashSet object from the method init()  HashSet studentSet = init();  //Print the size of the set  int size = studentSet.size();  System.out.println(“Size of student database is: “+size);  }  private static HashSet init() {  //Create HashSet object  HashSet studentSet = new HashSet<>();  //Add contents in HashSet  studentSet.add(“Peter”);  studentSet.add(“Watson”);  studentSet.add(“Desuja”);  studentSet.add(“Kevin”);  return studentSet;  }  }  

Test it Now

Output:

Size of student database is: 4

Next TopicHashSet spliterator() Method

add(E e)clear()clone()contains(Object o)hashset isempty()iterator java remove(Object o)size()spliterator()

Java HashSet size() Method with Examples

Java HashSet size() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

Java Float intValue() method with Examples

Java Integer rotateLeft() method with Examples

You may also like