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Program: How to add element at first position in LinkedList?


Description:

Below example shows how to add element at first position in LinkedList. LinkedList provides few methods to add element at first position, those methods are:

addFirst(): Inserts the specified element at the beginning of this list.
offerFirst(): Inserts the specified element at the front of this list.


Code:
package com.java2novice.linkedlist;

import java.util.LinkedList;

public class MyAddFirst {

	public static void main(String a[]){
		
		LinkedList<String> arrl = new LinkedList<String>();
		arrl.add("First");
		arrl.add("Second");
		arrl.add("Third");
		arrl.add("Random");
		System.out.println(arrl);
		System.out.println("Adding element at first position...");
		arrl.addFirst("I am first");
		System.out.println(arrl);
		System.out.println("Adding element at first position...");
		arrl.offerFirst("I am first - 2");
		System.out.println(arrl);
	}
}

Output:
[First, Second, Third, Random]
Adding element at first position...
[I am first, First, Second, Third, Random]
Adding element at first position...
[I am first - 2, I am first, First, Second, Third, Random]
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List Of All LinkedList Sample Programs:

  1. Basic LinkedList Operations.
  2. How to read all elements in LinkedList by using iterator?
  3. How to copy or clone a LinkedList?
  4. How to add all elements of a list to LinkedList?
  5. How to delete all elements from my LinkedList?
  6. How to find does LinkedList contains all list elements or not?
  7. How to copy LinkedList to array?
  8. How to get sub list from LinkedList?
  9. How to sort LinkedList using Comparator?
  10. How to reverse LinkedList content?
  11. How to shuffle elements in LinkedList?
  12. How to swap two elements in a LinkedList?
  13. How to convert list to csv string format?
  14. How to add element at first position in LinkedList?
  15. How to add element at last position in LinkedList?
  16. How to read first element from LinkedList?
  17. How to read last element from LinkedList?
  18. How to iterate through LinkedList in reverse order?
  19. LinkedList push(), pop() operations examples.
  20. How to remove elements from LinkedList?
Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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