core java in java questions asked in companies

All remote objects must extend UnicastRemoteObject, which provides functionality that is needed to make objects available from remote machines. In Java, UnicastRemoteObject is a class that provides support for creating and exporting remote objects with a specific protocol (typically, Java Remote Method Invocation or RMI). This class extends java.rmi.server.RemoteObject and implements the java.rmi.server.Unreferenced interface. The … Read more

  RMI architecture consists of four layers and each layer performs specific functions: a) Application layer – contains the actual object definition. b) Proxy layer – consists of stub and skeleton. c) Remote Reference layer – gets the stream of bytes from the transport layer and sends it to the proxy layer. Transportation layer – … Read more

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) … Read more

?– URL stands for Uniform Resource Locator and it points to resource files on the Internet. URL has four components: http://www. address. com:80/index.html, where http – protocol name, address – IP address or host name, 80 – port number and index.html – file path. In the context of Core Java, a URL (Uniform Resource Locator) … Read more

It is very difficult to remember a set of numbers(IP address) to connect to the Internet. The Domain Naming Service(DNS) is used to overcome this problem. It maps one particular IP address to a string of characters. For example, www. mascom. com implies com is the domain name reserved for US commercial sites, moscom is … Read more