Error Cannot Find Symbol Iterator
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developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is error cannot find symbol variable a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Iterator cannot find symbol method add() up vote 1 down vote favorite I am trying to iterate through an arraylist and add a new Book (custom class) to the list based on error cannot find symbol class builder a certain condition. My addBook function is below. The line bookIter.add() is giving me the error: 'cannot find symbol method add(Book)'. Any help would be greatly appreciated. Thanks public void addBook(String title, String authors, String publisher, int year) { Iterator bookIter; bookIter = this.books.iterator(); if (this.books.isEmpty()) { this.books.add(new Book(title, authors, publisher, year)); System.out.println(this.books.toString()); } else { while (bookIter.hasNext()) { Book book = bookIter.next(); if (book.getYear() == year) { System.out.println("Duplicate Years. Please try again."); } else { bookIter.add(new Book(title, authors, publisher, year)); System.out.println(this.books.toString()); } } } } java share|improve this question edited Oct 17 '15 at 18:33 phillip 579216 asked Oct 17 '15 at 18:17 user5457746 86 Iterator class is meant for iterating very quickly over a list, not to modify, even if you add to the list you instantiated the iterator from, at the moment of iterating, it will raise an exception. –Abderrahim ben Oct 17 '15 at 18:22 1 @Abderrahimben A ListIterat
This Site Careers Other all forums Forum: Beginning Java cannot find symbol - method iterator() Emanuel Mensa Ranch Hand Posts: 31 posted 3 years ago hello, can someone please help me with this error i get at compile time? here's my code: /** *
Error Cannot Find Symbol Method Findviewbyid(int)
A class which which creates a group of students */ import java.util.*; public class Grupa{ error cannot find symbol class googleplayservicesclient private Student[] students; //public int zaj = students.length; public boolean check; public Grupa(int n){ students = new Student[n]; } /*public boolean checkExist(Student
Error Cannot Find Symbol In Java
nall){ int p = 0; while (p < students.length){ if (students[p] == nall){ check = true; } p++; } } } */ public void wstaw(Student nall){ int i = 0; boolean check = false; Iterator it = students.iterator(); http://stackoverflow.com/questions/33190004/iterator-cannot-find-symbol-method-add while (it.hasNext()){ Student stu = next(); if (stu.getNaz == nall.getNaz()){ check = true; } } if (check == true){ System.out.println ("Student already exists"); } else { for (i = 0; i < students.length; i++){ if (students[i] == null){ students[i] = nall; break; } } } } public void show(){ int p = 0; int zaj = students.length; while(p < zaj && students[p] != null){ System.out.printf("%10s%n%10s%n%10d%n%1.1f", students[p].getNaz(), students[p].getName(), students[p].getIndeks(), students[p].getOcena()); p++; } } } Winston Gutkowski https://coderanch.com/t/605628/java/java/find-symbol-method-iterator Bartender Posts: 10527 64 I like... posted 3 years ago lalapnt pinto wrote:here's my code:... lalapnt, Please DontWriteLongLines (←click). I've broken yours up this time, but it makes your thread very hard to read. Oh, and welcome to JavaRanch. Winston "Leadership is nature's way of removing morons from the productive flow" - Dogbert Articles by Winston can be found here Matthew Brown Bartender Posts: 4568 9 posted 3 years ago You're calling iterator() on an array. Collection classes have that method, but arrays don't (see http://docs.oracle.com/javase/specs/jls/se7/html/jls-10.html#jls-10.7 for the members that arrays have). If you want to iterate over an array you can either use a normal for loop with an index, or you can use the enhanced for loop. If you don't need the index I'd use the latter. Emanuel Mensa Ranch Hand Posts: 31 posted 3 years ago oh! i see hehe thank you very much @Matthew Brown and thanks for the caution @Winston Gutkowski. are you from Poland? just btw Winston Gutkowski Bartender Posts: 10527 64 I like... posted 3 years ago lalapnt pinto wrote:and thanks for the caution @Winston Gutkowski. are you from Poland? Nah. My father. I've been a few times, but I'm afraid I don't know much more than dzień dobry, prosze and dziękuje. I do love flaczki though. Winston "Leadership is nature's way of removing m
to 2 of 2 Thread: cannot find symbol - method iterator() LinkBack LinkBack URL About LinkBacks Thread Tools Show Printable Version Email this Page… Subscribe to this http://www.java-forums.org/new-java/35450-cannot-find-symbol-method-iterator.html Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 11-30-2010,01:01 PM #1 D.Calladine Member Join Date Nov 2010 Posts 11 Rep Power 0 cannot http://ideone.com/BnYGSC find symbol - method iterator() just wondering how to fix this error its driving me insane Java Code: import javax.swing.*; import java.awt.*; import javax.swing.JFrame; import java.util.*; /** * Write a description error cannot of class RegHelper here. * * @author (your name) * @version (a version number or a date) */ public class RegHelper extends JPanel implements ChooserListener{ private JPanel courseChooserPanel; private CardLayout layout; private Map map; public RegHelper(ChooserListener listener){ super(); Box box = Box.createVerticalBox(); box.add(new DeptChooser(this)); layout = new CardLayout(); courseChooserPanel = new JPanel(layout); courseChooserPanel.add(new JPanel(), ""); map = new Hashtable(); Iterator iter = Department.getCollection().Iterator(); error cannot find while(iter.hasNext()) { Department dept = iter.next(); CourseChooser courseChooser = new CourseChooser(listener, dept); String deptcode = dept.getCode(); courseChooserPanel.add(courseChooser, deptCode); map.put(deptCode,courseChooser); } box.add(courseChooserPanel); add(box); } public void tell(Object o) { String deptcode = ((Department) o).getCode(); layout.show(courseChooserPanel, deptCode); map.get(deptCode).sayAgain(); } } Reply With Quote 11-30-2010,01:13 PM #2 masijade Senior Member Join Date Jun 2008 Posts 2,571 Rep Power 11 Java is case sensitive and the method is iterator, not Iterator Reply With Quote « GIOVYNET Java Serial Comm Port Question | looks good looking for suggestions.. » Similar Threads Cannot find symbol By Johanis in forum New To Java Replies: 19 Last Post: 11-04-2010, 09:13 PM cannot find symbol method initCause(java.lang.ClassNotFoundException) By Taxi in forum CLDC and MIDP Replies: 8 Last Post: 10-17-2010, 10:24 AM cannot find symbol By GabWit in forum New To Java Replies: 3 Last Post: 01-25-2009, 01:13 AM cannot find symbol symbol :constructor Error. Please help! =( By KalEl in forum New To Java Replies: 9 Last Post: 10-18-2008, 08:26 PM cannot find symbol symbol : class Item location: package platypos.services.order By officialhopsof in forum New To Java Replies: 3 Last Post: 05-01-2008, 08:30 AM B
{ // a simple hashMap declaration with default size and load factor HashMap hashMap = new HashMap(); // hashMap with multiple values with default size and load factor HashMap> multiMap = new HashMap>(); // Put elements to the hashMap hashMap.put("USA", new Integer(1)); hashMap.put("UK", new Integer(2)); hashMap.put("China",new Integer(3)); // take a value of a specific key System.out.println("Simple HashMap: Key 'UK' has value = " + hashMap.get("UK")); // see if a specific value or key is into the hashMap System.out.println("Simple HashMap containes value '1' - " + hashMap.containsValue(1)); System.out.println("Simple HashMap containes key 'Greece' - " + hashMap.containsKey("Greece")); // create an arrayList to store values ArrayList listOne = new ArrayList(); listOne.add("Blue"); listOne.add("Black"); listOne.add("Brown"); // create list two and store values ArrayList listTwo = new ArrayList(); listTwo.add("Pink"); listTwo.add("Purple"); // put values into map multiMap.put("B color", listOne); multiMap.put("P color", listTwo); // Get a set of the entries Set>> setMap = multiMap.entrySet(); // Get an iterator Iterator>> iteratorMap = setMap.iterator(); System.out.println("\nHashMap with Multiple Values"); // display all the elements while(iteratorMap.hasNext()) { Map.Entry> entry = (Map.Entry>) iteratorMap.next(); String key = entry.getKey(); List values = entry.getValue(); System.out.println("Key = '" + key + "' has values: " + values); } }} cHVibGljIGNsYXNzIEhhc2hNYXBUZXN0IHsKCglwdWJsaWMgc3RhdGljIHZvaWQgbWFpbihTdHJpbmdbXSBhcmdzKSB7CgoJCS8vIGEgc2ltcGxlIGhhc2hNYXAgZGVjbGFyYXRpb24gd2l0aCBkZWZhdWx0IHNpemUgYW5kIGxvYWQgZmFjdG9yCgkJSGFzaE1hcDxTdHJpbmcsIEludGVnZXI+IGhhc2hNYXAgPSBuZXcgSGFzaE1hcDxTdHJpbmcsIEludGVnZXI+KCk7CgkJLy8gaGFzaE1hcCB3aXRoIG11bHRpcGxlIHZhbHVlcyB3aXRoIGRlZ