LinkedList removeFirstOccurrence() Method in Java
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]