Daftar tautan
// Linked list operations in Java
class LinkedList {
Node head;
// Create a node
class Node {
int data;
Node next;
Node(int d) {
data = d;
next = null;
}
}
// Insert at the beginning
public void insertAtBeginning(int new_data) {
// insert the data
Node new_node = new Node(new_data);
new_node.next = head;
head = new_node;
}
// Insert after a node
public void insertAfter(Node prev_node, int new_data) {
if (prev_node == null) {
System.out.println("The given previous node cannot be null");
return;
}
Node new_node = new Node(new_data);
new_node.next = prev_node.next;
prev_node.next = new_node;
}
// Insert at the end
public void insertAtEnd(int new_data) {
Node new_node = new Node(new_data);
if (head == null) {
head = new Node(new_data);
return;
}
new_node.next = null;
Node last = head;
while (last.next != null)
last = last.next;
last.next = new_node;
return;
}
// Delete a node
void deleteNode(int position) {
if (head == null)
return;
Node temp = head;
if (position == 0) {
head = temp.next;
return;
}
// Find the key to be deleted
for (int i = 0; temp != null && i < position - 1; i++)
temp = temp.next;
// If the key is not present
if (temp == null || temp.next == null)
return;
// Remove the node
Node next = temp.next.next;
temp.next = next;
}
// Search a node
boolean search(Node head, int key) {
Node current = head;
while (current != null) {
if (current.data == key)
return true;
current = current.next;
}
return false;
}
// Sort the linked list
void sortLinkedList(Node head) {
Node current = head;
Node index = null;
int temp;
if (head == null) {
return;
} else {
while (current != null) {
// index points to the node next to current
index = current.next;
while (index != null) {
if (current.data > index.data) {
temp = current.data;
current.data = index.data;
index.data = temp;
}
index = index.next;
}
current = current.next;
}
}
}
// Print the linked list
public void printList() {
Node tnode = head;
while (tnode != null) {
System.out.print(tnode.data + " ");
tnode = tnode.next;
}
}
public static void main(String[] args) {
LinkedList llist = new LinkedList();
llist.insertAtEnd(1);
llist.insertAtBeginning(2);
llist.insertAtBeginning(3);
llist.insertAtEnd(4);
llist.insertAfter(llist.head.next, 5);
System.out.println("Linked list: ");
llist.printList();
System.out.println("\nAfter deleting an element: ");
llist.deleteNode(3);
llist.printList();
System.out.println();
int item_to_find = 3;
if (llist.search(llist.head, item_to_find))
System.out.println(item_to_find + " is found");
else
System.out.println(item_to_find + " is not found");
llist.sortLinkedList(llist.head);
System.out.println("\nSorted List: ");
llist.printList();
}
}
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