In this post, We will learn How to write a java program to Check Whether the given LinkedList length is even or odd?
Logic Used In Blow Source Code:
We have to use a 2X pointer means to take a pointer that moves two nodes at a time, in the end, if the length is even then the pointer will be null otherwise it will point to the last node.
Node.java
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package com.kkjavatutorials.util; /** * This class represent Node in Linked List * @author KK JavaTutorials */ public class Node<T>{ //Data hold by LinkedList Node private T data; //Reference to point next Node private Node<T> next; public Node(T data) { super(); this.data = data; this.next = null; } public T getData() { return data; } public void setData(T data) { this.data = data; } public Node<T> getNext() { return next; } public void setNext(Node<T> next) { this.next = next; } } |
LinkedList.java
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package com.kkjavatutorials.util; /** * Singly LinkedList Implementation * @author KK JavaTutorials */ public class LinkedList<T> { //head always point to first node private Node<T> head; /** * Method to insert Node in Linked List * @param newNode insert to List */ public void insert(Node<T> newNode) { if(isEmpty()) { head = newNode; }else { Node<T> current = head; while(current.getNext() !=null) { current = current.getNext(); } current.setNext(newNode); } } //Check if Linked is empty private boolean isEmpty() { return head == null; } /** * Method which traverse Linked List and display all data. */ public void displayLinkedList() { Node<T> currentNode = head; while(currentNode!= null) { System.out.print(currentNode.getData() +" "); currentNode = currentNode.getNext(); } } /** * Method to check whether LinkedList * Length is Odd or Even * @return true if LinkedList Length * is Odd else return false(means Length is Even) */ public boolean isLinkedListLengthOdd() { //Length is Odd boolean isOddLength = true; if(head == null) { //Length is Even isOddLength = false; return isOddLength; } while(head !=null && head.getNext() != null) { head = head.getNext().getNext(); } if(head == null) { //Length is Even isOddLength = false; return isOddLength; } return isOddLength; } } |
ClientTest.java
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package com.kkjavatutorials.util; /** * @author KK JavaTutorials * Client program to check whether LinkedList Length is Odd or Even */ public class ClientTest { public static void main(String[] args) { //Create LinkedList Instance LinkedList<Integer> linkedList1 = new LinkedList<>(); linkedList1.insert(new Node<Integer>(10)); linkedList1.insert(new Node<Integer>(20)); linkedList1.insert(new Node<Integer>(30)); linkedList1.insert(new Node<Integer>(50)); linkedList1.insert(new Node<Integer>(60)); linkedList1.insert(new Node<Integer>(70)); System.out.println("Displaying LinkedList:"); linkedList1.displayLinkedList(); System.out.println(); if(linkedList1.isLinkedListLengthOdd()) { System.out.println("LinkedList Length is Odd"); }else { System.out.println("LinkedList Length is Even"); } } } |
Output Of this Program:
Displaying LinkedList:
10 20 30 50 60 70
LinkedList Length is Even
Time Complexity: O[n/2] and Space Complexity: O(1) to hold boolean value(isOddLength)
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