Which classes/set of classes can illustrate polymorphism in the given code?

abstract class student
{
  public : int marks;
  calc_grade();
}
class topper:public student
{
    public : calc_grade()
    {
        return 10;
    }
};
class average:public student
{
    public : calc_grade()
    {
         return 20;
     }
};
class failed{ int marks;};

When a server wants to make an object available for URL lookups, it must bind that object instance to a string representing the:

Output of the given program? import java.io.*; class streams { public static void main(String[] args) { try { FileOutputStream fos = new FileOutputStream('serial'); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeFloat(3.5); oos.flush(); oos.close(); } catch(Exception e) { System.out.println('Serialization' + e); System.exit(0); } try { FileInputStream fis = new FileInputStream('serial'); ObjectInputStream ois = new ObjectInputStream(fis); ois.close(); System.out.println(ois.available()); } catch (Exception e) { System.out.print('deserialization'); System.exit(0); } } } }

How would you use a bean in a JSP page?

Which is incorrect about the CallableStatement interface?

Applications can use one of two mechanisms to obtain references to remote objects. First is an application that can register its remote objects with RMI's simple naming facility, the rmiregistry. What is the second one?

Java requires a ________ call for every object that's created.

In java, ________ must be declared before they can be used.

If an exception occurs in a try-catch block, the code in the finally clause ________.

Every class in java, except ________, extends an existing class.

Assume s is "" abc "", the method ________ returns a new string ""abc"".