{"id":135955,"date":"2024-05-31T10:34:22","date_gmt":"2024-05-31T05:04:22","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=135955"},"modified":"2024-05-31T10:34:22","modified_gmt":"2024-05-31T05:04:22","slug":"doubly-linked-list-in-dsa-java-part-2","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/doubly-linked-list-in-dsa-java-part-2\/","title":{"rendered":"Doubly Linked List in DSA Java Part &#8211; 2"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import java.util.*;\r\nclass DoubleLinkedList\r\n{\r\n       static class Node\r\n       {\r\n             Node ladd;\r\n             int data;\r\n             Node radd;\r\n       }\r\n       Node start=null,new1,prev1,next1,temp;\r\n       void create()\r\n       {\r\n             Scanner scan=new Scanner(System.in);\r\n             int n;\r\n             System.out.println(\"Enter first element\");\r\n             n=scan.nextInt();\r\n             start=new Node();\r\n             start.ladd=null;\r\n             start.data=n;\r\n             start.radd=null;\r\n             temp=start;\r\n             String choice;\r\n             System.out.println(\"Want to continue\");\r\n             choice=scan.next();\r\n             while(choice.toUpperCase().equals(\"Y\"))\r\n             {\r\n                System.out.println(\"Enter next element\");\r\n                n=scan.nextInt();\r\n                new1=new Node();\r\n                new1.ladd=null;\r\n                new1.data=n;\r\n                new1.radd=null;\r\n                temp.radd=new1;\r\n                new1.ladd=temp;\r\n                temp=temp.radd;\r\n                System.out.println(\"Want to continue\");\r\n                choice=scan.next();\r\n             }\r\n\r\n       }\r\n       void display()\r\n       {\r\n                 if(start==null)\r\n                 System.out.println(\"***********List not Found*************\");\r\n                 else\r\n                 {\r\n                      temp=start;\r\n                      while(temp!=null)\r\n                      {\r\n                        System.out.print(temp.data + \"    \");\r\n                           temp=temp.radd; \r\n                      }\r\n                 }\r\n\r\n       }\r\n        void reversedisplay()\r\n       {\r\n                 if(start==null)\r\n                 System.out.println(\"***********List not Found*************\");\r\n                 else\r\n                 {\r\n                     temp=start;\r\n                     while(temp.radd!=null)\r\n                     {\r\n                        temp=temp.radd;\r\n                     }\r\n                     while(temp!=null)\r\n                     {\r\n                        System.out.print(temp.data + \"   \");\r\n                        temp=temp.ladd;\r\n                     }\r\n                 }\r\n       }\r\n       void insertFirst()\r\n       {\r\n               if(start==null)\r\n                  System.out.println(\"***********List not Found*************\");\r\n               else\r\n               {\r\n                     Scanner scan=new Scanner(System.in);\r\n                     int n;\r\n                     System.out.println(\"Enter an element for insert\");\r\n                     n=scan.nextInt();\r\n                     new1=new Node();\r\n                     new1.data=n;\r\n                    \/\/ new1.add=null;\r\n                     new1.ladd=null;\r\n                     new1.radd=null;\r\n\r\n                     new1.radd=start;\r\n                     start.ladd=new1;\r\n                     start=new1;\r\n               }\r\n\r\n       }\r\n\r\n       void insertLast()\r\n       {\r\n               if(start==null)\r\n                  System.out.println(\"***********List not Found*************\");\r\n               else\r\n               {\r\n                     Scanner scan=new Scanner(System.in);\r\n                     int n;\r\n                     System.out.println(\"Enter an element for insert\");\r\n                     n=scan.nextInt();\r\n                     new1=new Node();\r\n                     new1.data=n;\r\n                     new1.ladd=null;\r\n                     new1.radd=null;\r\n                    temp=start;\r\n                    while(temp.radd!=null)\r\n                    {\r\n                       temp=temp.radd;\r\n                    }\r\n                    temp.radd=new1;\r\n                    new1.ladd=temp;\r\n               }\r\n\r\n       }\r\n\r\n       void insertMiddle()\r\n       {\r\n               if(start==null)\r\n                  System.out.println(\"***********List not Found*************\");\r\n               else\r\n               {\r\n                     Scanner scan=new Scanner(System.in);\r\n                     int n,pos,i;\r\n                     System.out.println(\"Enter an element for insert\");\r\n                     n=scan.nextInt();\r\n                     new1=new Node();\r\n                     new1.data=n;\r\n                     new1.ladd=null;\r\n                     new1.radd=null;\r\n                     System.out.println(\"Enter poistion for insert\");\r\n                     pos=scan.nextInt();\r\n                     i=1;\r\n                     next1=start;\r\n                     while(i&lt;pos)  \r\n                     {\r\n                           prev1=next1;\r\n                           next1=next1.radd;\r\n                           i++;\r\n                     }\r\n                     prev1.radd=new1;\r\n                     new1.ladd=prev1;\r\n                     new1.radd=next1;\r\n                     next1.ladd=new1;\r\n               }          \r\n       }\r\n       void deleteFirst()\r\n       {\r\n                if(start==null)\r\n                  System.out.println(\"***********List not Found*************\");\r\n               else\r\n               {\r\n                       temp=start;\r\n                       start=start.radd;\r\n                       System.out.println(\"Deleted node \" + temp.data);\r\n                       temp=null;\r\n               }\r\n       }\r\n\r\n       void deleteLast()\r\n       {\r\n                if(start==null)\r\n                  System.out.println(\"***********List not Found*************\");\r\n               else\r\n               {\r\n                       temp=start;\r\n                       while(temp.radd!=null)\r\n                       {\r\n                           temp=temp.radd;\r\n                       }\r\n                       prev1=temp.ladd;\r\n                         prev1.radd=null;\r\n                         System.out.println(\"Deleted node \" + temp.data);\r\n                         temp=null;\r\n               }\r\n       }\r\n\r\n          void deleteMiddle()\r\n          {\r\n               int i,pos;\r\n             if(start==null)\r\n                  System.out.println(\"***********List not Found*************\");\r\n               else\r\n               {\r\n                     Scanner scan=new Scanner(System.in);   \r\n                     System.out.println(\"Enter poisition of node for delete\");\r\n                     pos=scan.nextInt();   \r\n                        i=1;\r\n                        temp=start;\r\n                        while(i&lt;pos)\r\n                        {\r\n                              temp=temp.radd;\r\n                              i++;\r\n                        }\r\n                        prev1=temp.ladd;\r\n                        next1=temp.radd;\r\n                        prev1.radd=next1;\r\n                        next1.ladd=prev1;\r\n                         System.out.println(\"Deleted node \" + temp.data);\r\n                         temp=null;\r\n               }\r\n          }\r\n\r\n}\r\nclass TestDoubleList\r\n{\r\n        public static void main(String args[])\r\n    {\r\n        DoubleLinkedList D=new DoubleLinkedList();\r\n        Scanner scan=new Scanner(System.in);\r\n        int ch;\r\n      do\r\n     {   \r\n        System.out.println(\"\\n-------------------Doubly Linked List-------------------\");\r\n        System.out.println(\"1.Create\");\r\n        System.out.println(\"2.Display\");\r\n        System.out.println(\"3.Insert First\");\r\n        System.out.println(\"4.Insert Middle\");\r\n        System.out.println(\"5.Insert Last\");\r\n        System.out.println(\"6.Delete First\");\r\n        System.out.println(\"7.Delete Middle\");\r\n        System.out.println(\"8.Delete Last\");\r\n        System.out.println(\"9.Reverse Display\");\r\n        System.out.println(\"10.Exit\");\r\n        System.out.println(\"\\n--------------------------------------------------\\n\");\r\n         System.out.println(\"Enter your choice\");\r\n          ch=scan.nextInt();\r\n          switch(ch)\r\n          {\r\n            case 1:D.create();break;\r\n            case 2:D.display();break;\r\n            case 3:D.insertFirst();break;\r\n            case 4:D.insertMiddle();break;\r\n            case 5:D.insertLast();break;\r\n            case 6:D.deleteFirst();break;\r\n            case 7:D.deleteMiddle();break;\r\n            case 8:D.deleteLast();break;\r\n            case 9:D.reversedisplay();\r\n            case 10:break;\r\n          }\r\n     }while(ch!=10); \r\n    }\r\n  }<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 import java.util.*; class DoubleLinkedList { static class Node { Node ladd; int data; Node radd; } Node start=null,new1,prev1,next1,temp; void create() { Scanner scan=new Scanner(System.in); int n; System.out.println(&#8220;Enter first element&#8221;); n=scan.nextInt(); start=new Node();&#46;&#46;&#46;<\/p>\n","protected":false},"author":86671,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31451],"tags":[32307,4038,32306,32290,32294,32293],"class_list":["post-135955","post","type-post","status-publish","format-standard","hentry","category-dsa-java-tutorials","tag-data-structure-using-java","tag-doubly-linked-list","tag-doubly-linked-list-in-dsa-java","tag-dsa-using-java","tag-dsa-using-java-practical","tag-dsa-using-java-program"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Doubly Linked List in DSA Java Part - 2 - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/doubly-linked-list-in-dsa-java-part-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Doubly Linked List in DSA Java Part - 2 - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 import java.util.*; class DoubleLinkedList { static class Node { Node ladd; int data; Node radd; } Node start=null,new1,prev1,next1,temp; void create() { Scanner scan=new Scanner(System.in); int n; System.out.println(&quot;Enter first element&quot;); n=scan.nextInt(); start=new Node();&#046;&#046;&#046;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/data-flair.training\/blogs\/doubly-linked-list-in-dsa-java-part-2\/\" \/>\n<meta property=\"og:site_name\" content=\"DataFlair\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataFlairWS\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-05-31T05:04:22+00:00\" \/>\n<meta name=\"author\" content=\"TechVidvan Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:site\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"TechVidvan Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Doubly Linked List in DSA Java Part - 2 - DataFlair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/data-flair.training\/blogs\/doubly-linked-list-in-dsa-java-part-2\/","og_locale":"en_US","og_type":"article","og_title":"Doubly Linked List in DSA Java Part - 2 - DataFlair","og_description":"Program 1 import java.util.*; 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