?– Every computer connected to a network has an IP address. An IP address is a number that uniquely identifies each computer on the Net. An IP address is a 32-bit number. In Java, InetAddress is a class that represents an Internet Protocol (IP) address. It is part of the java.net package and provides methods for working with IP addresses. The InetAddress class can be used to create instances representing both IPv4 and IPv6 addresses. Here’s a brief overview of…
An object reference be cast to an interface reference when the object implements the referenced interface. In Java, an object reference can be cast to an interface reference when the object’s class implements that interface. This is possible because Java supports polymorphism through interfaces. Here’s a brief explanation: When the Object Implements the Interface: If a class implements an interface, you can cast an object of that class to a reference of the interface type. java interface MyInterface { void…
An argument can be passed in two ways. They are passing by value and passing by reference. Passing by value: This method copies the value of an argument into the formal parameter of the subroutine. Passing by reference: In this method, a reference to an argument (not the value of the argument) is passed to the parameter.
Remote Method Invocation (RMI) allows java object that executes on one machine and to invoke the method of a Java object to execute on another machine. The steps involved in developing an RMI object are: a) Define the interfaces b) Implementing these interfaces c) Compile the interfaces and their implementations with the java compiler d) Compile the server implementation with RMI compiler e) Run the RMI registry f) Run the application
An event-listener interface defines the methods that must be implemented by an event handler for a particular kind of event. An event adapter provides a default implementation of an event-listener interface. In Java, event-listener interfaces and event-adapter classes are related to handling events in graphical user interface (GUI) programming. Here’s the explanation: Event-Listener Interface: An event-listener interface in Java defines the methods that must be implemented by any class that wants to handle a specific type of event. These interfaces…
finalize () method is used just before an object is destroyed and can be called just prior to garbage collection. In Core Java, the finalize() method is a method provided by the Object class. It is called by the garbage collector when it determines that there are no more references to the object. The purpose of the finalize() method is to allow an object to perform cleanup operations before it is garbage-collected. Here’s a brief overview of how the finalize()…
rebind() of the Naming class(found in java. rmi) is used to update the RMI registry on the server machine. Naming. rebind(”AddSever”, AddServerImpl); lookup() of the Naming class accepts one argument, the rmi URL and returns a reference to an object of type AddServerImpl. I’m sorry, but there seems to be a misunderstanding. As of my last knowledge update in January 2022, there are no rebind() and lookup() methods in the Naming class in Core Java. In Java, the Naming class…
A component can handle its own events by implementing the required event-listener interface and adding itself as its own event listener. In Java, GUI components can handle their own events by implementing event listener interfaces. The most common way to handle events for GUI components is by implementing listener interfaces such as ActionListener, MouseListener, KeyListener, etc. Here is a brief explanation: Implementing Event Listener Interface: To handle events on a GUI component, you need to make your class implement the…
a) In overloading, there is a relationship between methods available in the same class whereas in overriding, there is relationship between a superclass method and subclass method. b) Overloading does not block inheritance from the superclass whereas overriding blocks inheritance from the superclass. c) In overloading, separate methods share the same name whereas in overriding, subclass method replaces the superclass. d) Overloading must have different method signatures whereas overriding must have same signature.
?– (1) Request Lifetime: Using this technique to pass beans, a request dispatcher (using either “include” or forward”) can be called. This bean will disappear after processing this request has been completed. Servlet: request. setAttribute(”theBean”, myBean); RequestDispatcher rd = getServletContext(). getRequestDispatcher(”thepage. jsp”); rd. forward(request, response); JSP PAGE:<jsp: useBean id=”theBean” scope=”request” class=”. . . . . ” />(2) Session Lifetime: Using this technique to pass beans that are relevant to a particular session (such as in individual user login) over a…