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Java program to delete a node from the beginning of the singly linked list

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Java program to delete a node from the beginning of the singly linked list

In this example, we will create a java program of singly linked list and delete a node from the beginning of the list.

Program:


public class Main 
{  
class Node
{  
int data;  
Node next;  

public Node(int data) 
{  
this.data = data;  
this.next = null;  
}  
}  

public Node head = null;  
public Node tail = null;  

public void addNode(int data) 
{  
Node newNode = new Node(data);  

if(head == null) 
{  
head = newNode;  
tail = newNode;  
}  
else 
{  
tail.next = newNode;  
tail = newNode;  
}  
}  

public void deleteFromStart() 
{  

if(head == null) 
{  
System.out.println("List is empty");  
return;  
}  
else 
{  
if(head != tail) 
{  
head = head.next;  
}  
else 
{  
head = tail = null;  
}  
}  
}  

public void display() 
{  
Node current = head;  
if(head == null) {  
System.out.println("List is empty");  
return;  
}  
while(current != null) {  
System.out.print(current.data + " ");  
current = current.next;  
}  
System.out.println();  
}  

public static void main(String[] args) {  

Main sList = new Main();  

sList.addNode(1);  
sList.addNode(2);  
sList.addNode(3);  
sList.addNode(4);  

System.out.println("Original List: ");  
sList.display();  

while(sList.head != null) {  
sList.deleteFromStart();  
System.out.println("Updated List: ");  
sList.display();  
}  
}  
}

Output:-
Original List:
1 2 3 4
Updated List:
2 3 4
Updated List:
3 4
Updated List:
4
Updated List:
List is empty

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