Software & Finance - Monthly Magazine Online

Volume 3 - Issue 11

November 2013

Singly Linked List using Java

I have given here Java sample code for singly linked list, filling elements and traversal in forward direction.

Singly Linked List, Doubly Linked List, Singly Linked Circular List and Doubly Linked Circular List are an important data structure used in Java applications.

import java.lang.*;

import java.util.*;

import java.io.*;

class SLinkedList

{

private int data;

private SLinkedList next;

public SLinkedList()

{

data = 0;

next = null;

}

public SLinkedList(int value)

{

data = value;

next = null;

}

public SLinkedList InsertNext(int value)

{

SLinkedList node = new SLinkedList(value);

if(this.next == null)

{

// Easy to handle

node.next = null; // already set in constructor

this.next = node;

}

else

{

// Insert in the middle

SLinkedList temp = this.next;

node.next = temp;

this.next = node;

}

return node;

}

public int DeleteNext()

{

if(next == null)

return 0;

SLinkedList node = this.next;

this.next = this.next.next; // can be NULL here

node = null;

return 1;

}

public void Traverse(SLinkedList node)

{

if(node == null)

node = this;

System.out.println("\n\nTraversing in Forward Direction\n\n");

while(node != null)

{

System.out.println(node.data);

node = node.next;

}

}

public static void main(String[] args)

{

SLinkedList node1 = new SLinkedList(1);

SLinkedList node2 = node1.InsertNext(2);

SLinkedList node3 = node2.InsertNext(3);

SLinkedList node4 = node3.InsertNext(4);

SLinkedList node5 = node4.InsertNext(5);

node1.Traverse(null);

node3.DeleteNext(); // delete the node "4"

node2.Traverse(null);

}

}

Traversing in Forward Direction

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Traversing in Forward Direction

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