CODEWITHSUNDEEP
javaintbluej
BBladem83
BBladem83

Reputation: 623

"int cannot be dereferenced" in Java

I'm fairly new to Java and I'm using BlueJ. I keep getting this "Int cannot be dereferenced" error when trying to compile 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;
    }

    // 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();
            }
        }
    }
}

Upvotes: 39

Views: 328706

Answers (8)

Ujjwal Pal
Ujjwal Pal

Reputation: 1

I think you are getting this error in the initialization of the Integer somewhere

Upvotes: 0

Ashwani Kumar Kushwaha
Ashwani Kumar Kushwaha

Reputation: 171

Dereferencing is the process of accessing the value referred to by a reference . Since, int is already a value (not a reference), it can not be dereferenced. so u need to replace your code (.) to(==).

Upvotes: 2

Ashit
Ashit

Reputation: 59

As your methods an int datatype, you should use "==" instead of equals()

try replacing this if (id.equals(list[pos].getItemNumber()))

with

if (id.equals==list[pos].getItemNumber())

it will fix the error .

Upvotes: 0

Juned Ahsan
Juned Ahsan

Reputation: 68715

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"

Upvotes: 33

Ali Hashemi
Ali Hashemi

Reputation: 3368

try 

id == list[pos].getItemNumber()

instead of 

id.equals(list[pos].getItemNumber()

Upvotes: -1

Code-Apprentice
Code-Apprentice

Reputation: 83537

Change

id.equals(list[pos].getItemNumber())

to

id == list[pos].getItemNumber()

For more details, you should learn the difference between the primitive types like int, char, and double and reference types.

Upvotes: 0

MadProgrammer
MadProgrammer

Reputation: 347234

Basically, you're trying to use int as if it was an Object, which it isn't (well...it's complicated)

id.equals(list[pos].getItemNumber())

Should be...

id == list[pos].getItemNumber()

Upvotes: 6

John3136
John3136

Reputation: 29266

Assuming getItemNumber() returns an int, replace

if (id.equals(list[pos].getItemNumber()))

with

if (id == list[pos].getItemNumber())

Upvotes: 0

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