Java LinkedHashSet size() Method

The LinkedHashSet.size() method in Java is used to determine the number of elements in the LinkedHashSet.

Table of Contents

1. Introduction
2. size Method Syntax
3. Examples
   • Determining the Size of a LinkedHashSet
   • Handling an Empty LinkedHashSet
4. Real-World Use Case
   • Use Case: Inventory Management System
5. Conclusion

Introduction

The LinkedHashSet.size() method is a member of the LinkedHashSet class in Java. It allows you to determine the number of elements currently present in the LinkedHashSet. This method is useful for getting the size of the set.

size() Method Syntax

The syntax for the size method is as follows:

public int size()

• The method does not take any parameters.
• The method returns an integer representing the number of elements in the LinkedHashSet.

Examples

Determining the Size of a LinkedHashSet

The size method can be used to determine the number of elements in a LinkedHashSet.

Example

import java.util.LinkedHashSet;
import java.util.Set;

public class SizeExample {
    public static void main(String[] args) {
        // Creating a LinkedHashSet of Strings using the Set interface as reference type
        Set<String> fruits = new LinkedHashSet<>();

        // Adding elements to the LinkedHashSet
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Cherry");

        // Determining the size of the LinkedHashSet
        int size = fruits.size();

        // Printing the size of the LinkedHashSet
        System.out.println("Size of the LinkedHashSet: " + size);
    }
}

Output:

Size of the LinkedHashSet: 3

Handling an Empty LinkedHashSet

The size method returns 0 if the LinkedHashSet contains no elements.

Example

import java.util.LinkedHashSet;
import java.util.Set;

public class EmptySizeExample {
    public static void main(String[] args) {
        // Creating an empty LinkedHashSet of Strings using the Set interface as reference type
        Set<String> fruits = new LinkedHashSet<>();

        // Determining the size of the empty LinkedHashSet
        int size = fruits.size();

        // Printing the size of the LinkedHashSet
        System.out.println("Size of the empty LinkedHashSet: " + size);
    }
}

Output:

Size of the empty LinkedHashSet: 0

Real-World Use Case

Use Case: Inventory Management System

In an inventory management system, you might need to determine the number of items currently in stock. The size method can be used to get the total count of items in the inventory.

Example

import java.util.LinkedHashSet;
import java.util.Set;

public class InventoryManagementSystem {
    public static void main(String[] args) {
        // Creating a LinkedHashSet to store inventory items using the Set interface as reference type
        Set<String> inventory = new LinkedHashSet<>();

        // Adding items to the inventory
        inventory.add("Apple");
        inventory.add("Banana");
        inventory.add("Cherry");

        // Determining the size of the inventory
        int size = inventory.size();

        // Printing the size of the inventory
        System.out.println("Number of items in the inventory: " + size);
    }
}

Output:

Number of items in the inventory: 3

Conclusion

The LinkedHashSet.size() method in Java provides a way to determine the number of elements in a LinkedHashSet. By understanding how to use this method, you can efficiently get the size of your collections. This method is useful for determining the count of elements in a set, making it a valuable tool for collection management in your Java applications. The real-world use case of an inventory management system illustrates the practical application of this method in determining the number of items in stock.