Search Elements of LinkedList in Java with Example

Java LinkedList Examples

Java LinkedList class provides the following methods to search an element of LinkedList in Java:
  • contains(Object o)
  • indexOf(Object o)
  • lastIndexOf(Object o)

Search Elements of LinkedList in Java with Example

Let's create a list of employees and apply LinkedList search methods.
LinkedList<String> employees = new LinkedList<>(); employees.add("John"); employees.add("David"); employees.add("Lara"); employees.add("Chris"); employees.add("Steve"); employees.add("David");

contains(Object o)

Check if the LinkedList contains an element
System.out.println("Does Employees LinkedList contain \"Lara\"? : " + employees.contains("Lara"));

indexOf(Object o)

Find the index of the first occurrence of an element in the LinkedList
System.out.println("indexOf \"Steve\" : " + employees.indexOf("Steve")); System.out.println("indexOf \"Mark\" : " + employees.indexOf("Mark"));

lastIndexOf(Object o)

Find the index of the last occurrence of an element in the LinkedList
System.out.println("lastIndexOf \"David\" : " + employees.lastIndexOf("David")); System.out.println("lastIndexOf \"Bob\" : " + employees.lastIndexOf("Bob"));

Complete Example

package com.javaguides.collections.linkedlistexamples; import java.util.LinkedList; public class SearchLinkedListExample { public static void main(String[] args) { LinkedList < String > employees = new LinkedList < > (); employees.add("John"); employees.add("David"); employees.add("Lara"); employees.add("Chris"); employees.add("Steve"); employees.add("David"); // Check if the LinkedList contains an element System.out.println("Does Employees LinkedList contain \"Lara\"? : " + employees.contains("Lara")); // Find the index of the first occurrence of an element in the LinkedList System.out.println("indexOf \"Steve\" : " + employees.indexOf("Steve")); System.out.println("indexOf \"Mark\" : " + employees.indexOf("Mark")); // Find the index of the last occurrence of an element in the LinkedList System.out.println("lastIndexOf \"David\" : " + employees.lastIndexOf("David")); System.out.println("lastIndexOf \"Bob\" : " + employees.lastIndexOf("Bob")); } }

Output

Does Employees LinkedList contain "Lara"? : true indexOf "Steve" : 4 indexOf "Mark" : -1 lastIndexOf "David" : 5 lastIndexOf "Bob" : -1

Reference




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