How to Create a HashSet With a Predefined Capacity in Java?

Last Updated : 01 Feb, 2024

In Java, we can create HashSet with a predefined capacity by creating a constructor and passing the capacity as a parameter to it. We have to initialize the capacity using a variable otherwise you can pass a direct value to it.

Syntax:

HashSet <datatype>myset=new HashSet<>(capacity);

Here, myset is the name of the set and capacity defines the size of it.

Program to Create a HashSet with a Predefined Capacity in Java

Java

// Java Program to create a HashSet with a predefined capacity 
import java.util.*; 
  
class GFG { 
    public static void main (String[] args) { 
       
        int capacity = 10; 
  
        // Create a HashSet with a predefined capacity 
        HashSet<String> myset = new HashSet<>(capacity); 
  
        // Adding elements to the HashSet 
         
        myset.add("Flowers"); 
        myset.add("Fruits"); 
           myset.add("Colours"); 
  
        // Display the elements in the myset 
        System.out.println(myset); 
        
    } 
} 

Output

[Colours, Flowers, Fruits]

Explanation of the above Program:

In the above example, we have initialized the capacity variable with 10 using the HashSet constructor.
After that, we have passed as a parameter to the constructor HashSet for which myset has been created of size 10.
Then it adds three elements by using add() method to the HashSet.
At last, it prints the values of the HashSet.

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