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 –
- For loop
- Advanced For loop
- Iterator
- 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