Thread: why am I getting NullPointerException.

myProducts[0].supplierName = ikea;

That code won't compile because ikea is not declared anywhere.

@mia_tech please read the problem with spoonfeeding

ok, now I know what spoon-feeding is... I guess by removing my code is a sign that it was correct. Am asking b/c I would like to hear about a better implementation or at least a confirmation that it was correct

Originally Posted by mia_tech

ok, now I know what spoon-feeding is... I guess by removing my code is a sign that it was correct. Am asking b/c I would like to hear about a better implementation or at least a confirmation that it was correct

I owe you an apology. I didn't realize you were the OP posting your own code. I am so sorry. I thought someone else fixed the code. Please post it again and forgive my mistake.

Originally Posted by jps

I owe you an apology. I didn't realize you were the OP posting your own code. I am so sorry. I thought someone else fixed the code. Please post it again and forgive my mistake.

that was kind of strange, since I get no feed back weather my solution is correct or not. Anyways, here it goes again. If someone could take a look at it and let me know if is correct

public class Main {
 
	public static void main(String[] args) {
 
		Product[] myProducts = new Product[3];		
 
		Supplier ikea = new Supplier();	
		ikea.supplierName = "ikea";
		Product chair = new Product();
		chair.productName = "chair";
		chair.supplier = ikea;
		myProducts[0] = chair;
 
		Product table = new Product();
		table.productName = "table";
		table.supplier = ikea;
		myProducts[1] = table;
 
		Supplier javaBlackBelt = new Supplier();
		javaBlackBelt.supplierName = "javaBlackBelt";
		Product ooProgramming = new Product();
		ooProgramming.productName = "javaBlackBelt";
		ooProgramming.supplier = javaBlackBelt;
		myProducts[2] = ooProgramming;
 
		for(Product p: myProducts) {
			System.out.println(p.productName+" is from "+p.supplier.supplierName);
		}		
 
	}
 
}

public class Product {
 
	String productName;
	Supplier supplier;	
 
}

public class Supplier {
 
	String supplierName;	
 
}

that was kind of strange, since I get no feed back weather my solution is correct or not.

Yes, removing the code was my mistake. It was late and I thought there was one name on the OP and ya, it shouldn't have been removed. I read over a hundred (and answer most) of questions a day on multiple forums, sometimes mistakes happen I guess.

If someone could take a look at it and let me know if is correct

Does it compile? Does it run? Are there any error messages? Does it perform as expected? Writing programs is much more than getting code typed up. Troubleshooting and testing are part of the development process. The first thing to do after writing code is try to break it. Or to put it in better words, try to prove that the code is broken.