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Listing 4. BookPK.java, the Primary Key Class for Our Entity Bean

package il.co.lerner.book;

import java.io.Serializable;

public class BookPK implements java.io.Serializable
{
    public int id;
    public BookPK () { }

    public BookPK(int value)
    {
	id = value;
    }

    public boolean equals(Object obj)
    {
	if (obj == null || !(obj instanceof BookPK))
	    return false;

	if (((BookPK)obj).id == id)
	    return true;
	
	return false;
    }

    public int hashCode ()
    {
	return id;
    }


    public String toString()
    {
	return String.valueOf(id);
    }
}