How to loop LinkedList in Java

In the last tutorial we discussed LinkedList and it’s methods with example. Here we will see how to loop/iterate a LinkedList. There are four ways in which a LinkedList can be iterated –

1. For loop
2. Advanced For loop
3. Iterator
4. While Loop

Example:

In this example we have a LinkedList of String Type and we are looping through it using all the four mentioned methods.

package beginnersbook.com;
import java.util.*;

public class LinkedListExample {

   public static void main(String args[]) {
      /*LinkedList declaration*/
      LinkedList<String> linkedlist=new LinkedList<String>();
      linkedlist.add("Apple");
      linkedlist.add("Orange");
      linkedlist.add("Mango");

      /*for loop*/
      System.out.println("**For loop**");
      for(int num=0; num<linkedlist.size(); num++)
      {
    	  System.out.println(linkedlist.get(num));
      }

      /*Advanced for loop*/
      System.out.println("**Advanced For loop**");
      for(String str: linkedlist)
      {
    	  System.out.println(str);
      }

      /*Using Iterator*/
      System.out.println("**Iterator**");
      Iterator i = linkedlist.iterator();
      while (i.hasNext()) {
	  System.out.println(i.next());
      }

      /* Using While Loop*/
      System.out.println("**While Loop**");
      int num = 0;
      while (linkedlist.size() > num) {
	  System.out.println(linkedlist.get(num));
	  num++;
      }

   }
}

Output:

**For loop**
Apple
Orange
Mango
**Advanced For loop**
Apple
Orange
Mango
**Iterator**
Apple
Orange
Mango
**While Loop**
Apple
Orange
Mango