Java - Singly Linked Circular List
I have given here Java sample code for singly linked circular list, filling elements and traversal in forward direction and counting the number of elements in the list.
Singly Linked List, Doubly Linked List, Singly Linked Circular List and Doubly Linked Circular List are an important data structure used in Java applications.
The main difference between singly linked list and singly linked circular list are the next node pointer of last node is NULL in case of singly linked list where as next node pointer of last node is first node in case of singly linked circular list.
If there is only one node in singly linked circular list, then this condition will be true (this == this->next)
Related Links:
- Turbo C++ - Reverse Singly Linked List
- Turbo C++ - Singly Linked Circular List
- Turbo C++ - Doubly Linked List
- Turbo C++ - Singly Linked List
- Visual C++ Program to Reverse Singly Linked List
- Visual C++ Program for Singly Linked Circular List
- Visual C++ Program for Doubly Linked List
- Visual C++ Program for Singly Linked List
- Java - Reverse Singly Linked List
- Java - Singly Linked Circular List
- Java - Doubly Linked List
- Java - Singly Linked List
- C# - Reverse Singly Linked List
- C# - Singly Linked Circular List
- C# - Doubly Linked List
- C# - Singly Linked List
Source Code
import java.lang.*;
import java.util.*;
import java.io.*;
class SLinkedCircularList
{
private int data;
private SLinkedCircularList next;
public SLinkedCircularList()
{
data = 0;
next = this;
}
public SLinkedCircularList(int value)
{
data = value;
next = this;
}
public SLinkedCircularList InsertNext(int value)
{
SLinkedCircularList node = new SLinkedCircularList(value);
if (this.next == this) // only one node in the circular list
{
// Easy to handle, after the two lines of executions,
// there will be two nodes in the circular list
node.next = this;
this.next = node;
}
else
{
// Insert in the middle
SLinkedCircularList temp = this.next;
node.next = temp;
this.next = node;
}
return node;
}
public int DeleteNext()
{
if (this.next == this)
{
System.out.println("\nThe node can not be deleted as there is only one node in the circular list");
return 0;
}
SLinkedCircularList node = this.next;
this.next = this.next.next;
node = null;
return 1;
}
public void Traverse()
{
Traverse(this);
}
public void Traverse(SLinkedCircularList node)
{
if (node == null)
node = this;
System.out.println("\n\nTraversing in Forward Direction\n\n");
SLinkedCircularList startnode = node;
do
{
System.out.println(node.data);
node = node.next;
}
while (node != startnode);
}
public int GetNumberOfNodes()
{
return GetNumberOfNodes(this);
}
public int GetNumberOfNodes(SLinkedCircularList node)
{
if (node == null)
node = this;
int count = 0;
SLinkedCircularList startnode = node;
do
{
count++;
node = node.next;
}
while (node != startnode);
System.out.println("\nCurrent Node Value: " + node.data);
System.out.println("\nTotal nodes in Circular List: " + count);
return count;
}
public static void main(String[] args)
{
SLinkedCircularList node1 = new SLinkedCircularList(1);
node1.DeleteNext(); // Delete will fail in this case.
SLinkedCircularList node2 = node1.InsertNext(2);
node1.DeleteNext(); // It will delete the node2.
node2 = node1.InsertNext(2); // Insert it again
SLinkedCircularList node3 = node2.InsertNext(3);
SLinkedCircularList node4 = node3.InsertNext(4);
SLinkedCircularList node5 = node4.InsertNext(5);
node1.GetNumberOfNodes();
node3.GetNumberOfNodes();
node5.GetNumberOfNodes();
node1.Traverse();
node3.DeleteNext(); // delete the node "4"
node2.Traverse();
node1.GetNumberOfNodes();
node3.GetNumberOfNodes();
node5.GetNumberOfNodes();
}
}
Output
The node can not be deleted as there is only one node in the circular list
Current Node Value: 1
Total nodes in Circular List: 5
Current Node Value: 3
Total nodes in Circular List: 5
Current Node Value: 5
Total nodes in Circular List: 5
Traversing in Forward Direction
1
2
3
4
5
Traversing in Forward Direction
2
3
5
1
Current Node Value: 1
Total nodes in Circular List: 4
Current Node Value: 3
Total nodes in Circular List: 4
Current Node Value: 5
Total nodes in Circular List: 4
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