Java Linked List

Insert an Element into Linked List Java

import java.util.LinkedList; 

public class LinkedListInsertElementExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");

System.out.println("LinkedList contains : " + lList);

lList.add(2, "2.5");

System.out.println("After inserting 2.5, LinkedList contains : " + lList);

    }

}

Iterate through elements of Java Linked List using List Iterator

import java.util.ListIterator;

import java.util.LinkedList;

public class IterateLinkedListUsingListIteratorExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");

ListIterator itr = lList.listIterator();

System.out.println("Iterating through elements of Java LinkedList using

ListIterator in forward direction...");

while(itr.hasNext())

{

System.out.println(itr.next());

}

System.out.println("Iterating through elements of Java LinkedList using

ListIterator in reverse direction...");

while(itr.hasPrevious())

System.out.println(itr.previous());

   }

}

Remove all elements or clear Linked List Java

import java.util.LinkedList;

public class RemoveAllElementsLinkedListExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");

System.out.println("LinkedList contains : " + lList);

lList.clear();

System.out.println("LinkedList now contains : " + lList);

   }

}

Remove first and last elements of Linked List Java

import java.util.LinkedList;

public class RemoveFirstLastElementsLinkedListExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");

System.out.println("LinkedList contains : " + lList);

Object object = lList.removeFirst();

System.out.println(object + " has been removed from the first index

of LinkedList");

System.out.println("LinkedList now contains : " + lList);

object = lList.removeLast();

System.out.println(object + " has been removed from the last index

of LinkedList");

System.out.println("LinkedList now contains : " + lList);

   }

}

Remove range of elements from Linked List Java

import java.util.LinkedList;

import java.util.List; 

public class RemoveRangeElementsLinkedListExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");

System.out.println("LinkedList contains : " + lList);

lList.subList(2,5).clear();

System.out.println("Range of elements removed from LinkedList");

System.out.println("LinkedList now contains : " + lList);

    }

}

Remove specified element from Linked List Java

import java.util.LinkedList;

public class RemoveElementLinkedListExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");  

System.out.println("LinkedList contains : " + lList);

boolean isRemoved = lList.remove("2");

System.out.println("Is 2 removed from LinkedList ? :" + isRemoved);

System.out.println("LinkedList now contains : " + lList);

Object obj = lList.remove(2);

System.out.println(obj + " has been removed from LinkedList");

System.out.println("LinkedList now contains : " + lList);

   }

}

Replace an Element of Linked List Java

import java.util.LinkedList;

public class LinkedListReplaceElementExample

{

public static void main(String[] args)

{

LinkedList lList = new LinkedList();

lList.add("1");

lList.add("2");

lList.add("3");

lList.add("4");

lList.add("5");

System.out.println("LinkedList contains : " + lList);   

lList.set(3, "Replaced");

System.out.println("After replacing 4, LinkedList contains : " + lList);

   }

}