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

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.