Java LinkedHashSet remove() Method

The LinkedHashSet.remove(Object o) method in Java is used to remove a specified element from the LinkedHashSet.

Table of Contents

1. Introduction
2. remove Method Syntax
3. Examples
   • Removing an Element from LinkedHashSet
   • Handling Removal of Non-Present Elements
4. Real-World Use Case
   • Use Case: Inventory Management System
5. Conclusion

Introduction

The LinkedHashSet.remove(Object o) method is a member of the LinkedHashSet class in Java. It allows you to remove a specified element from the LinkedHashSet. This method is useful for deleting elements from a set.

remove() Method Syntax

The syntax for the remove method is as follows:

public boolean remove(Object o)

• The method takes a single parameter o of type Object, which represents the element to be removed from the LinkedHashSet.
• The method returns a boolean value:
  • true if the LinkedHashSet contained the specified element and it was removed.
  • false if the LinkedHashSet did not contain the specified element.

Examples

Removing an Element from LinkedHashSet

The remove method can be used to remove a specified element from the LinkedHashSet.

Example

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

public class RemoveExample {
    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");

        // Removing the element "Banana"
        boolean isRemoved = fruits.remove("Banana");

        // Printing the result of the removal and the LinkedHashSet
        System.out.println("Was 'Banana' removed? " + isRemoved);
        System.out.println("LinkedHashSet after removal: " + fruits);
    }
}

Output:

Was 'Banana' removed? true
LinkedHashSet after removal: [Apple, Cherry]

Handling Removal of Non-Present Elements

The remove method returns false if the specified element is not present in the LinkedHashSet.

Example

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

public class RemoveNonPresentExample {
    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");

        // Attempting to remove the element "Mango"
        boolean isRemoved = fruits.remove("Mango");

        // Printing the result of the removal and the LinkedHashSet
        System.out.println("Was 'Mango' removed? " + isRemoved);
        System.out.println("LinkedHashSet after removal: " + fruits);
    }
}

Output:

Was 'Mango' removed? false
LinkedHashSet after removal: [Apple, Banana, Cherry]

Real-World Use Case

Use Case: Inventory Management System

In an inventory management system, you might need to remove items from the inventory once they are sold out. The remove method can be used to achieve this functionality.

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");

        // Removing a sold-out item
        String itemToRemove = "Banana";
        if (inventory.remove(itemToRemove)) {
            System.out.println(itemToRemove + " was removed from the inventory.");
        } else {
            System.out.println(itemToRemove + " was not found in the inventory.");
        }

        // Printing the remaining inventory
        System.out.println("Remaining inventory: " + inventory);
    }
}

Output:

Banana was removed from the inventory.
Remaining inventory: [Apple, Cherry]

Conclusion

The LinkedHashSet.remove(Object o) method in Java provides a way to remove a specified element from a LinkedHashSet. By understanding how to use this method, you can efficiently manage and manipulate elements in your collections. This method is useful for deleting elements from 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 removing sold-out items from the inventory.