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LinkedList removeFirstOccurrence() Method in Java

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  • Last Updated : 30 Jun, 2022
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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, otherwise it returns false.
Below programs illustrate the removeFirstOccurrence() method: 
Program 1 :  

java




// Java code to demonstrate removeFirstOccurrence() method
import java.util.LinkedList;
public class GfG {
    // Main method
    public static void main(String[] args)
    {
 
        // Creating a LinkedList object
        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




// 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 object
        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]

 


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