How to Delete User Defined Objects from LinkedHashSet?

Last Updated : 28 Jun, 2021

The LinkedHashSet is an ordered version of HashSet that maintains a doubly-linked List across all elements. When the iteration order is needed to be maintained this class is used. When iterating through a HashSet the order is unpredictable, while a LinkedHashSet lets us iterate through the elements in the order in which they were inserted.

Example:

Input: ["Geeks", "for", "geeks"]
DELETE = "geeks"
Output: "Geeks"
    "for"

Input: [1, 2, 3, 4, 5]
DELETE = 2
Output: [1, 3, 4, 5]

There are two ways by which we can delete elements from LinkedHashSet:

Using remove() Method
Using clear() Method

Method 1: remove() methods are used to delete a specific element from a LinkedHashSet object.

Syntax:

LinkedHashSet.remove(Object O)

Parameters: The parameter O is of the type of LinkedHashSet and specifies the element to be removed from the LinkedHashSet.

Return Value: This method returns True if the specified element is present in the LinkedHashSet otherwise it returns False.

Java

// Java program  to delete user defined 
// objects from LinkedHashSet

import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        LinkedHashSet<String> lset
            = new LinkedHashSet<String>();

        // add elements to HashSet
        lset.add("GEEKS");
        lset.add("FOR");
        lset.add("GEEKS");

        // Displaying the LinkedHashSet Before Deleting
        System.out.println("Before deleting an element :");
        System.out.println(lset);

        // remove() method to delete an element from
        // LinkedHashSet
        lset.remove("FOR");

        // Displaying the LinkedHashSet After Deleting
        System.out.println("After deleting an element:");
        System.out.println(lset);
    }
}

Output

Before deleting an element :
[GEEKS, FOR]
After deleting an element:
[GEEKS]

Method 2: clear() method is used to delete all element from LinkedHashSet. The set will be empty after this call returns.

Syntax:

public void clear()

Return Value: This method does not return anything.

Below are the examples to illustrate the clear() method.