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Write a Java Program to Get the middle element of LinkedList in a single iteration
PROGRAM: Java Program to Get the middle element of LinkedList in a single iteration
/*Java Program to Get the middle element of LinkedList in a single iteration*/
1: Get the middle element of LinkedList in a single search
class LinkedList {
// create an object of Node class
// represent the head of the linked list
Node head;
// static inner class
static class Node {
int value;
// connect each node to next node
Node next;
Node(int d) {
value = d;
next = null;
}
}
public static void main(String[] args) {
// create an object of LinkedList
LinkedList linkedList = new LinkedList();
// assign values to each linked list node
linkedList.head = new Node(1);
Node second = new Node(2);
Node third = new Node(3);
// connect each node of linked list to next node
linkedList.head.next = second;
second.next = third;
// print the linked list
Node pointer = linkedList.head;
System.out.print(“LinkedList: ” );
while (pointer != null) {
System.out.print(pointer.value + ” “);
pointer = pointer.next;
}
// Find the middle element
Node ptr1 = linkedList.head;
Node ptr2 = linkedList.head;
while (ptr1.next != null) {
// increase the ptr1 by 2 and ptr2 by 1
// if ptr1 points to last element
// ptr2 will points to middle element
ptr1 = ptr1.next;
if(ptr1.next !=null) {
ptr1 = ptr1.next;
ptr2 = ptr2.next;
}
}
System.out.println(“\nMiddle Element: ” + ptr2.value);
}
}
2: Get the middle element of LinkedList using the LinkedList class
import java.util.LinkedList;
class Main {
public static void main(String[] args){
// create a linked list using the LinkedList class
LinkedList<String> animals = new LinkedList<>();
// Add elements to LinkedList
animals.add(“Dog”);
animals.addFirst(“Cat”);
animals.addLast(“Horse”);
System.out.println(“LinkedList: ” + animals);
// access middle element
String middle = animals.get(animals.size()/2);
System.out.println(“Middle Element: ” + middle);
}
}
