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Java Program to Access elements from a LinkedList.

Java Program to Access elements from a LinkedList.

In this example, we will learn to access elements from a LinkedList in Java using various methods.

Example 1: Access elements from a linkedlist

import java.util.LinkedList;

class Main {
  public static void main(String[] args) {
    LinkedList<String> languages = new LinkedList<>();

    // add elements in the LinkedList
    languages.add("Python");
    languages.add("Java");
    languages.add("JavaScript");
    System.out.println("LinkedList: " + languages);

    // get the element from the LinkedList
    String str = languages.get(1);
    System.out.print("Element at index 1: " + str);
  }
}

Output

LinkedList: [Python, Java, JavaScript]
Element at index 1: Java

In the above example, we have used the get() method with parameter 1. Here, the method returns the element at index 1.


Example 2: Using iterator() method

We can also use the iterator() method to iterate over the elements of a linkedlist. We must import java.util.Iterator package to use this method. For example,

import java.util.LinkedList;
import java.util.Iterator;

class Main {
    public static void main(String[] args) {
        LinkedList<String> animals= new LinkedList<>();

        // Add elements in LinkedList
        animals.add("Dog");
        animals.add("Horse");
        animals.add("Cat");

        // Creating an object of Iterator
        Iterator<String> iterate = animals.iterator();
        System.out.print("LinkedList: ");

        while(iterate.hasNext()) {
            System.out.print(iterate.next());
            System.out.print(", ");
        }
    }
}

Output

LinkedList: Dog, Cat, Horse,

Here,

  • hasNext() - returns true if there is a next element
  • next() - returns the next element

To learn more about Iterator, visit the Java Iterator Interface.


Example 3: Using listIterator() method

We can also use the listIterator() method to iterate over the elements of a LinkedList. To use this method, we must import java.util.ListIterator package.

import java.util.LinkedList;
import java.util.ListIterator;

class Main {
    public static void main(String[] args) {
        LinkedList<String> animals= new LinkedList<>();

        // Add elements in LinkedList
        animals.add("Dog");
        animals.add("Horse");
        animals.add("Cat");

        // Create an object of ListIterator
        ListIterator<String> listIterate = animals.listIterator();
        System.out.print("LinkedList: ");

        while(listIterate.hasNext()) {
            System.out.print(listIterate.next());
            System.out.print(", ");
        }

        // Iterate backward
        System.out.print("\nReverse LinkedList: ");

        while(listIterate.hasPrevious()) {
            System.out.print(listIterate.previous());
            System.out.print(", ");
        }
    }
}

Output

LinkedList: Dog, Horse, Cat,
Reverse LinkedList: Cat, Horse, Dog,

Here,

  • hasNext() - returns true if there is a next element
  • next() - returns the next element
  • hasPrevious() - returns true if there exist previous elements
  • previous() - returns the previous element

To learn more about ListIterator, visit Java ListIterator Interface.

Note: The listIterator() method is more preferred than iterator(). This is because it allows you to iterate backward as well.