Key Class for Products

[Pradeep Shankar]

How can I change this class so that it is suitable for use as a key in a collection.

All three fields (serialNumber, productName and price) are required to uniquely identify a product.

Instances of this class will be utilized as key values in a JNDI lookup operation

public class ProductKey {

	private String serialNumber;
	
	private String productName;
	
	private Double price;
	
	public ProductKey(String serialNumber, String productName, String price) {
		setSerialNumber(serialNumber);
		setProductName(productName);
		setPrice(price);
	}

	private void setSerialNumber(String serialNumber) {
		this.serialNumber = serialNumber;
	}

	private void setProductName(String productName) {
		this.productName = productName;
	}

	private void setPrice(String price) {
		this.price = price;
	}
}

Thank you for taking the time to read this...

[Henry Wong]

By "key", I am assuming you want this in a map.... well, then, the answer is "it depends".

If you want it in a hashing map, then you need to implement the equals() and hashCode() method. And if you want it in a treemap, then you either need to make your instance implement Comparable, or write a Comparator class for it.

Henry

[Campbell Ritchie]

. . . and it ought to be immutable, if you ever want to find it again

[Pradeep Shankar]

Thanks guys...

Requirements:

This interface should be used to retrieve details regarding an payment. A JNDI lookup will result in a suitable implementation being returned (assume that it is bound to the JNDI_NAME supplied below). The interface has been simplified to exclude and remote method invocation concepts.

Interface for retrieving details of an payment:

public interface PaymentFinder {
	
	/**
	 * The location in JNDI where you will find this service.
	 */
	public static final String JNDI_NAME = "env/svc/PaymentFinder";

	public PaymentDetails findPayment(PaymentKey key);
}

So it can be used in the front end app, see:

Bind Class to HttpSession Posting

Would appreciate it if someone could help me.