package pro; import java.util.scanner; public class bookapp { static book head, pointer; static scanner input = new scanner(system.in); public static void main(string[] args) { system.out.println("welcome szabist book store"); int choice = 0; { system.out.println(); system.out.println("1. insert book"); system.out.println("2. delete book"); system.out.println("3. udpate book"); system.out.println("4. search book"); system.out.println("5. view book(s)"); system.out.println("6. exit"); system.out.print("enter choice: "); try { choice = integer.parseint(input.nextline()); } catch (exception e) { e.printstacktrace(); } switch (choice) { case 1: addbook(); break; case 2: deletebook(); break; case 3: udpatebook(); break; case 4: searchbook(); break; case 5: viewbook(); break; case 6: input.close(); system.exit(0); break; default: system.out.println("wrong choice try again!"); } } while (true); } private static void viewbook() { if (head == null) { system.out.println("list empty !"); } else { pointer = head; (book = pointer; != null; = pointer.next) { system.out.println(pointer.getbook()); pointer = pointer.next; } } } private static void searchbook() { // todo auto-generated method stub } private static void udpatebook() { // todo auto-generated method stub } private static void deletebook() { // todo auto-generated method stub } public static void addbook() { if (head == null) { string details[] = enterdetails(); pointer = new book(details[0], details[1], details[2]); head = pointer; pointer.next = null; } else { string details[] = enterdetails(); pointer.next = new book(details[0], details[1], details[2]); pointer = pointer.next; pointer.next = null; } } public static string[] enterdetails() { string[] details = new string[3]; try { string title; string isbn; system.out.print("please enter book title: "); title = input.nextline(); system.out.print("please enter book isbn: "); isbn = input.nextline(); string authors; system.out.print("enter book author(s): "); authors = input.nextline(); details[0] = title; details[1] = isbn; details[2] = authors; } catch (exception e) { e.printstacktrace(); } { } return details; } } //class package pro; public class book { string[] authors; static string publisher; final string isbn; final string title; book next; book(string title, string isbn, string... authors){ this.isbn = isbn; this.title = title; this.authors = new string[authors.length]; int i=0; (string s: authors){ this.authors[i]=s; i++; } } public string getbook(){ return "book title: " + this.title + "\n" + "book isbn: " + this.isbn + "\n" + "book author(s):" + getauthors() +"\n" ; } public string getauthors(){ stringbuilder s = new stringbuilder(); (string s1: this.authors){ s.append(s1 + ","); } return s.tostring(); } } want add search book update book delete book in linked list in java when press 2 update book when press 3 search book when press 4 delete book in linked list in java. cant find way out
call book id search search method.
private static void book searchbook(int book_id) { if(head == null) return null; book iterator = head; while(iterator != null){ if(iterator.getid() == book_id){ return iterator; } iterator = iterator.next; } return null; } 
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