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Why there is a need to use primary key in database ?
Primary key is a constraint basically used in datdabase to uniquely identify the records in the database.
Explain Subclasses and Polymorphism ? Car and Motorcycle are subclasses of MotorVehicle. If you instantiate a Car or a Motorcycle along with new, you can use in which object a
Struts is a framework with set of co operating servlets, classes and JSP tags that create a reusable MVC 2 design. 1. Client (Browser) : A request from the cli
Define enumeration? Enumeration is explained as values type that having of a set of named values. These values are constants and are called enumerators. An enumeration type is
Don''t know how to write this...can anyone help me?
Describe even higer dimensions in java? You don't have to stop along with two dimensional arrays. Java allows arrays of three, four or more dimensions. Therefore chances are pr
Requested figure handle in use by another object, how do i fix this?
What is constructor chaining and how is it achieved in Java? A child object constructor always first requires to construct its parent (which in turn calls its parent constructo
public class Tester { static void test(int[] a) { int[] b = new int[2]; a = b; System.out.print(b.length); System.out.print(a.length); } public static void main(String[] arg
EJB 2.0 has the additional advantages over the EJB 1.1 given below 1. Local interfaces : These are beans that can be needed locally, that means by the same Java Virtual Machi
What is numeric promotion ?
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