The Java.util.LinkedList.indexOf(Object element) method is used to check and find the occurrence of a particular element in the list. If the element is present then the index of the first occurrence of the element is returned otherwise -1 is returned if the list does not contain the element.
Syntax:
LinkedList.indexOf(Object element)
Parameters: The parameter element is of the type LinkedList. It specifies the element whose occurrence is needed to be checked in the LinkedList.
Return Value: The method returns the index or position of the first occurrence of the element in the list else -1 if the element is not present in the list. The returned value is of integer type.
Below program illustrate the Java.util.LinkedList.indexOf() method:
// Java code to illustrate indexOf()import java.io.*;import java.util.LinkedList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");        // Displaying the list      System.out.println("LinkedList:" + list);              // The first position of an element       // is returned      System.out.println("The first occurrence of Geeks is at index:"                                               + list.indexOf("Geeks"));      System.out.println("The first occurrence of 10 is at index: "                                                 + list.indexOf("10"));     }} |
Output:
LinkedList:[Geeks, for, Geeks, 10, 20] The first occurrence of Geeks is at index: 0 The first occurrence of 10 is at index: 3
