Cannot Dereferenced Error Java
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Java Char Cannot Be Dereferenced
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Int Cannot Be Dereferenced Java Meaning
takes a minute: Sign up “int cannot be dereferenced” in Java up vote 9 down vote favorite 2 I'm fairly new to Java and I'm using BlueJ. I keep getting this "Int cannot be dereferenced" error when trying to compile
Int Cannot Be Dereferenced Tostring
and I'm not sure what the problem is. The error is specifically happening in my if statement at the bottom, where it says "equals" is an error and "int cannot be dereferenced." Hope to get some assistance as I have no idea what to do. Thank you in advance! public class Catalog { private Item[] list; private int size; // Construct an empty catalog with the specified capacity. public Catalog(int max) { list = new Item[max]; size = 0; } int cannot be dereferenced length // Insert a new item into the catalog. // Throw a CatalogFull exception if the catalog is full. public void insert(Item obj) throws CatalogFull { if (list.length == size) { throw new CatalogFull(); } list[size] = obj; ++size; } // Search the catalog for the item whose item number // is the parameter id. Return the matching object // if the search succeeds. Throw an ItemNotFound // exception if the search fails. public Item find(int id) throws ItemNotFound { for (int pos = 0; pos < size; ++pos){ if (id.equals(list[pos].getItemNumber())){ //Getting error on "equals" return list[pos]; } else { throw new ItemNotFound(); } } } } java int bluej share|improve this question edited Jul 19 at 0:13 Sotirios Delimanolis 154k25245361 asked Oct 1 '13 at 6:08 BBladem83 183129 2 You're trying to using a int where an Integer, Number or Object is expected...int does not have any methods –MadProgrammer Oct 1 '13 at 6:09 add a comment| 5 Answers 5 active oldest votes up vote 9 down vote accepted id is of primitive type int and not an Object. You cannot call methods on a primitive as you are doing here : id.equals Try replacing this: if (id.equals(list[pos].getItemNumber())){ //Getting error on "equals" with if (id == list[pos].getItemNumber()){ //Getting error on "equals" share|improve this answer edited Mar 23 at 3:23 answered Oct 1 '13 at 6:10 Juned Ahsan 44.6k64774 add a comment| up vote 1 down vote Basically, you're try
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About int cannot be dereferenced compareto Us Learn more about Stack Overflow the company Business Learn more about hiring int cannot be dereferenced equals java developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the boolean cannot be dereferenced java Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error of int cannot be http://stackoverflow.com/questions/19109131/int-cannot-be-dereferenced-in-java dereferenced? up vote 0 down vote favorite I am getting an error with this constructor, and i have no idea how to fix? I am a beginner at java. This is from an example exercise that i was trying to learn: /** * Create an array of size n and store a copy of the contents of the * input argument * @param intArray array of http://stackoverflow.com/questions/28213083/error-of-int-cannot-be-dereferenced elements to copy */ public IntArray11(int[] intArray) { int i = 0; String [] Array = new String[intArray.length]; for(i=0; i
New Topic programming forums Java Java JSRs Mobile Certification Databases Caching Books Engineering Languages Frameworks Products This Site Careers Other all forums Forum: Beginning Java int cannot be dereferenced error Collete Williams Greenhorn Posts: 4 posted 5 years https://coderanch.com/t/536655/java/java/int-dereferenced-error ago I know this error has been written numerous times, but I am still confused https://teamtreehouse.com/community/help-with-error-code-boolean-cannot-be-dereferenced about why I received the error. I am very new to Java, this is my first and last programming class. This is the first time I have seen this error and lost. I know it has something to do with the int and string. I am confused all together how it works. Code is suppose to accept an integer from cannot be user, go thru the array and find the element of that array and display in a textfield. It also has to handle 2 specific exceptions. Can someone please tell me what it is suppose to look like. Thank you.. int cannot be dereferenced-line 53 //import java.lang.*; public class showElement implements ActionListener{ public void actionPerformed(ActionEvent e){ randomNumber = new int [100]; for (int x = 0; x < randomNumber.length; x++) randomNumber[x] = (int)(Math.random() * 1000); String cannot be dereferenced inputString; inputString=valueField.getText(); try{ valueField.setText(randomNumber[Integer.parseInt(inputString)].toString());//error section } catch (IndexOutOfBoundsException ex){ valueField.setText("Out of bounds"); } catch (NumberFormatException ex){ valueField.setText("Not a Integer."); } } } Kurt Van Etten Ranch Hand Posts: 98 posted 5 years ago 1 Hi Collete, and welcome to the Ranch! The error you're getting, in line 17 of the code excerpt you posted, is because you're trying to call the toString() method on an int (since that's what's stored in the array), and int is a primitive type. There are several ways you could convert the int to a String: for example, you could concat it with an empty string to have it implicitly converted, or you could use the static Integer.toString() method to explicitly convert it . Collete Williams Greenhorn Posts: 4 posted 5 years ago I read up on on what it means to "concat it with an empty string" and "static Integer.toString() method" but I'm sorry I am still confused. Originally I had major help with that line but it looks like it did not work. Are you saying this line: valueField.setText(randomNumber[Integer.parseInt(inputString)].toString()); needs to changed to one of the options? Been trying for 2 weeks to get this working and I am burned out majorly and have gone brain dead. Is it possible for you to show me if not maybe a example. Campbell Ritchie Sheriff Pos
with error code: "Boolean cannot be dereferenced" So i'm new to this and during my challenge i keep getting this error message but i can't figure out how to fix it, or rather what i'm doing wrong i suppose. I thought i did it right, can anyone explain to me what i'm doing wrong? Thank you! ~Ryan Example.java // I have initialized a java.io.Console for you. It is in a variable named console. String question; boolean response; do { question = console.readLine("Do you understand do while loops? "); response = (question.equalsIgnoreCase("yes")); if (response) { console.printf("Congrats"); } } while(response); 1 Answer MOD Rob Bridges Java Web Development Treehouse Moderator 13,395 Points Rob Bridges Rob Bridges Java Web Development Treehouse Moderator 13,395 Points over 1 year ago Hey there Rian, The trouble that is getting caused is because you're trying to set up your boolean, I think that java thinks you're trying to change the value to be the string representation of true, instead of a boolean. In reality you have all the code that you need to pass this challenge minus a few adjustments (good job). The first thing to do is take out the boolean. Also, be sure to name your string as response, otherwise the challenge won't allow you to move on to the next step, so it should look something like, and when we're checking to see if we want to break out of the loop, check to see if the response is equal to no. Other than that, good job again! String response; do { response = console.readLine("Do you understand do while loops? "); } while(response.equalsIgnoreCase("no")); Thanks I hope this helps, feel free to shout at me if it doesn't. Ryan Loveland 328 Points Ryan Loveland Ryan Loveland 328 Points >1y ago Ooohhh okay, the course just prior to the quiz was talking about booleans in the end, so when the question talked about storing the answer i assumed thats what it was asking me to do, lol. i'm still a little unclear about how "do" and "while" works, but hopefully it'll be discussed more in the next courses. Thank you very much for your help, i really appreciate it :) ~Ryan Rob Bridges Java Web Development Treehouse Moderator 13,395 Points Rob Bridges Rob Bridges Java Web Development Treehouse Moderator 13,395 Po