Abstract keyword used for method declaration declares the methods without implementations.
Abstract class in java have abstract methods that is not implemented in abstract class, but implemented in subclasses in java program. If the class in java program is not required to get instantiated than that class use the abstract keyword but this class rather is available for other classes to extend by other classes.
Abstract keyword will be used in method declaration to declare that method without providing the implementation in that java program. In other words we can say that, it formally unfinished class as well as method, that marked with the help of keyword abstract.
Defining abstract is a way of preventing someone from instantiating a class that is supposed to be extended first. In java program abstract class is deliberately missing similar to like an interface which will missing all method bodies in the program. Abstract class provides a way to extend an actual class. We will not use new on abstract classes but will use abstract references in the java program, that always point to objects of the class that extends an abstract class.
In java program for practical use of an abstract class, we will define a non-abstract class that extends an abstract one. This will use any of the inherited non-abstract methods.
Most of the time abstract class may extend another abstract class. In that condition it need not implement all in the non-abstract methods. An abstract keyword used both on classes and methods. In case of class declared with an abstract keyword may not be instantiated that is the only thing that abstract keyword doing.
Abstraction in Java or Object oriented programming is a way to segregate implementation from interface and one of the five fundamentals along with Encapsulation, Inheritance, Polymorphism, Class and Object. Abstraction in Java is achieved by using interface and abstract class in Java.
java supports procedural abstraction by means of constructors and methods. in java constructor and methods are always components of particular class. java supports coping parameter only. procedural abstraction is a principle in which the particular language supports some features through which procedures are modelled in the class hiding other details.
java exception
The Socket class in Java is an endpoint in a standard TCP connection. The Socket class implements methods which take care of all the overhead required with TCP communication.
it informs compiler about its possible exceptions. For example,The purpose of Java exception is to tell the Java runtime system what can go wrong
Abstraction in Java or Object oriented programming is a way to segregate implementation from interface and one of the five fundamentals along with Encapsulation, Inheritance, Polymorphism, Class and Object. Abstraction in Java is achieved by using interface and abstract class in Java.
java supports procedural abstraction by means of constructors and methods. in java constructor and methods are always components of particular class. java supports coping parameter only. procedural abstraction is a principle in which the particular language supports some features through which procedures are modelled in the class hiding other details.
To create an abstraction or a blueprint for a class to implement later.
because java supports three main pillars.....(inheritance encapsulation and abstraction)..... and everything in java is OBJECT......
yes it is not tangible and is represented by a concept.
java exception
The purpose of vector Java is to make more Java possibilities for mobile and uniformed devices. The makers of Java said that they wanted to "revolutionize" the way that Java works and helps around the globe.
features are: 1. Inheritance 2. Polymorphism 3. Data Encapsulation 4. Data Abstraction etc..
The Socket class in Java is an endpoint in a standard TCP connection. The Socket class implements methods which take care of all the overhead required with TCP communication.
Java is the leading mobile phone developers and carriers. The purpose of Java's Mobile Media API is to play record sounds and videos and to also capture still images.
Programs that are specifically designed with Java require a Java runtime to work on a computer. (In the case of Java, the runtime is called "Java Virtual Machine".) If you have any such program, you need to have Java.
it informs compiler about its possible exceptions. For example,The purpose of Java exception is to tell the Java runtime system what can go wrong