LinkedList removeFirstOccurrence() Method in Java

Last Updated : 10 Dec, 2018

The java.util.LinkedList.removeFirstOccurrence() is used to remove the first occurrence of the specified element from the list. If there is no occurrence of the specified element the list remains unchanged.

Syntax:

LinkedListObject.removeFirstOccurrence(Object element)

Parameters: The method takes one parameter element which is to be removed from the list. The type Object should be the same as the elements in the list.

Return Value: The method returns boolean True if the list contains the specified element and is deleted, otherwisr it returns false.

Below programs illustrate the removeFirstOccurrence() method:
Program 1 :

// Java code to demonstrate removeFirstOccurrence() method 
import java.util.LinkedList; 
public class GfG { 
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Creating a LinkedList objec 
        LinkedList<String> list = new LinkedList<String>(); 
  
        // Adding an element at the last 
        list.addLast("one"); 
  
        // Adding an element at the last 
        list.addLast("two"); 
  
        // Adding an element at the last 
        list.addLast("three"); 
  
        // Adding an element at the last 
        list.addLast("one"); 
  
        System.out.print("List before removing the "+ 
                   "first Occurrence of \"one\" : "); 
  
        // Printing the list 
        System.out.println(list); 
  
        // Removing first occurrence of one. 
        boolean returnValue = list.removeFirstOccurrence("one"); 
  
        // Printing the returned value 
        System.out.println("Returned Value : " + returnValue); 
  
        System.out.print("List after removing the"+ 
                            " first Occurrence of \"one\" : "); 
  
        // Printing the list 
        System.out.println(list); 
    } 
} 

Output:

List before removing the first Occurrence of "one" : [one, two, three, one]
Returned Value : true
List after removing the first Occurrence of "one" : [two, three, one]

Program 2 :

// Java code to demonstrate removeFirstOccurrence method in LinkedList 
  
import java.util.LinkedList; 
  
public class GfG { 
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Creating a LinkedList objec 
        LinkedList<Integer> list = new LinkedList<Integer>(); 
  
        // Adding an element at the last 
        list.addLast(10); 
  
        // Adding an element at the last 
        list.addLast(20); 
  
        // Adding an element at the last 
        list.addLast(30); 
  
        // Adding an element at the last 
        list.addLast(10); 
  
        System.out.print("List before removing the"+ 
                  " first Occurrence of \"10\" : "); 
  
        // Printing the list 
        System.out.println(list); 
  
        // Removing first occurrence of one. 
        boolean returnValue = list.removeFirstOccurrence(10); 
  
        // Printing the returned value 
        System.out.println("Returned Value : " + returnValue); 
  
        System.out.print("List after removing the"+ 
                           " first Occurrence of \"10\" : "); 
  
        // Printing the list 
        System.out.println(list); 
    } 
} 

Output:

List before removing the first Occurrence of "10" : [10, 20, 30, 10]
Returned Value : true
List after removing the first Occurrence of "10" : [20, 30, 10]

Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.

My Personal Notes

Related Articles