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You want the base class to represent only an interface for its derived classes. That means, you don't want anyone to actually instantiate an object of the parent class. You only want to upcast to it so that its interface may be used. This is accomplished by building that class abstract using the abstract keyword. If anyone tries to build an object of an abstract class, the compiler saves it.
The interface keyword makes this concept of an abstract class a step further by preventing any function or method implementation at all. You can only define a method or function but not give the implementation. The class, which is adding the interface, should give the actual implementation. The interface is a commonly and very useful used aspect in OO design, as it gives the implementation and separation of interface and actives you to:
1. Use similarities among unrelated classes without artificially forcing a class relationship.
2. Define methods that one or more classes are expected to implement.
3. Reveal an object's programming interface without revealing its basic implementation.
4. Model multilevel interface inheritance in Java, which gives some of the benefits of full on multiple inheritances, a feature that some object-oriented languages support that allow a class to have more than one parented class.
which concept is used to connect the networking in java
RMI transport layer usually opens direct sockets to the server. Several Intranets have firewalls that do not accept this. To get through the firewall an RMI call may be embedded wi
1. Arrays and working with arrays
Socket and ServerSocket. ServerSocket is used for normal two-way socket communication. Socket class permits us to read and write by the sockets. getInputStream() and getOutputStrea
Write a Java Applet which will draw a face on applet as follows: b) Modify the program now by adding two Buttons (Java version of ActiveX Control) named Smily Fac
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What is Event Handler works? An event handler is a command which is used to call a function when an event happens, such as the user clicking a button or mouse.
Where the local varible declared? Declaring variables within a function, makes them local .They are available only within that function and hold no meaning outside of it
Explain Java package and methods to use it?
Is it possible to create any dialog window in Oracle in Java stored procedure?
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