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Program: How to read first element from LinkedList?


Description:

Below example shows how to read first element from LinkedList. LinkedList provides few methods to read first element, those methods are:

element(): Retrieves, but does not remove, the head (first element) of this list.
getFirst(): Returns the first element in this list.
peek(): Retrieves, but does not remove, the head (first element) of this list.
peekFirst(): Retrieves, but does not remove, the first element of this list, or returns null if this list is empty.


Code:
package com.java2novice.linkedlist;

import java.util.LinkedList;

public class MyFirstElement {

	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("First Element: "+arrl.element());
		System.out.println("First Element: "+arrl.getFirst());
		System.out.println("First Element: "+arrl.peek());
		System.out.println("First Element: "+arrl.peekFirst());
	}
}

Output:
First Element: First
First Element: First
First Element: First
First Element: First
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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
Java class can be private?
We can not declare top level class as private. Java allows only public and default modifier for top level classes in java. Inner classes can be private.
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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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