How to Delete User Defined Objects from LinkedHashSet?
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.Â
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);    }} |
Before deleting an element : [GEEKS, FOR] After deleting an element: [GEEKS]
Method 2: clear() method is used to delete all element from LinkedHashSet. Â 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.
Java
// Java program to delete elements// from LinkedHashSet  import java.util.*;import java.util.LinkedHashSet;  public class GFG {    public static void main(String[] args)    {          LinkedHashSet<String> l_set            = new LinkedHashSet<String>();          // add elements to HashSet        l_set.add("GEEKS");        l_set.add("FOR");        l_set.add("GEEKS");          // Displaying the LinkedHashSet Before Deleting        System.out.println("Before deleting an element :");        System.out.println(l_set);          // clear() method to delete all element from        // LinkedHashSet        l_set.clear();          // Displaying an empty LinkedHashSet After Deleting        System.out.println("After deleting all element:");        System.out.println(l_set);    }} |
Before deleting an element : [GEEKS, FOR] After deleting all element: []
