HttpServlet is declared abstract
Explain why HttpServlet is declared abstract ?
View Answers
November 2, 2010 at 3:14 PM
The Constructor HttpServlet() does nothing because this is an abstract class. Default implementations in a few Java classes like HttpServlet don?t really do anything. Hence, they need to be overridden.
Usually one of the following methods of HttpServlet must be overridden by a subclass:
- doGet, if the servlet supports HTTP GET requests
- doPost, HTTP POST requests
- doPut, HTTP PUT requests
- doDelete, HTTP DELETE requests
- init and destroy, to manage resources
- getServletInfo, to provide information
May 6, 2013 at 7:44 PM
Hi, 1)Suppose HttpServlet Class isn't declared as abstract,Still there is no use of creating the object of HttpServlet class because all the method present inside the HttpServlet mostly does nothing. 2)Declaring HttpServlet as abstract,provides a signal to the Developer that the class has no practical use, and don't create the object of this class. rather have your own implementation for your service. 3)you can override any method from doxxx or service() method for your Servlet,and you can have own business logic.not necessary to override all the methods of HttpServlet. any corrections are welcomed,let me know if i am wrong anywhere. Thanks Balu
Related Tutorials/Questions & Answers:
HttpServlet is declared abstract
HttpServlet is declared abstract Explain why HttpServlet is declared abstract
HttpServlet is declared abstract Explain why HttpServlet is declared abstract
variables and methods declared in abstract class is abstract or not
variables and methods declared in abstract class is abstract or not variables and methods declared in abstract class is abstract
variables and methods declared in abstract class is abstract or not variables and methods declared in abstract class is abstract
Advertisements
Can a abstract class be declared final?
Can a abstract class be declared final? Hi, Can a abstract class be declared final? Thanks
Can a abstract class be declared final? Hi, Can a abstract class be declared final? Thanks
Java Abstract Class
Java Abstract Class An abstract class is a class that is declared by using the abstract keyword. It may or may not have abstract methods. Abstract classes cannot be instantiated
Java Abstract Class An abstract class is a class that is declared by using the abstract keyword. It may or may not have abstract methods. Abstract classes cannot be instantiated
Java httpservlet
Java httpservlet HttpServlet class is an abstract class defined in "javax.servlet.http"...-independent servlet but HttpServlet class provides an HTTP protocol specific
Java httpservlet HttpServlet class is an abstract class defined in "javax.servlet.http"...-independent servlet but HttpServlet class provides an HTTP protocol specific
Difference between GenericServlet and HttpServlet
and HttpServlet. GenericServlet is an abstract class that extends java.lang.Object while HttpServlet is an abstract class that extends GenericServlet... abstract service() to be overridden. A subclass of HttpServlet must override
and HttpServlet. GenericServlet is an abstract class that extends java.lang.Object while HttpServlet is an abstract class that extends GenericServlet... abstract service() to be overridden. A subclass of HttpServlet must override
Abstract Class in Java
Abstract class in Java is a class that is declared using abstract keyword.... An abstract method is declared without body but is followed by a semicolon.ADS... be declared as:ADS_TO_REPLACE_3 abstract class AbstractClass { } How to use
Abstract class in Java is a class that is declared using abstract keyword.... An abstract method is declared without body but is followed by a semicolon.ADS... be declared as:ADS_TO_REPLACE_3 abstract class AbstractClass { } How to use
HttpServlet protocols
HttpServlet protocols What are the type of protocols supported by HttpServlet? It extends the GenericServlet base class and provides an framework for handling the HTTP protocol. So, HttpServlet only supports HTTP
HttpServlet protocols What are the type of protocols supported by HttpServlet? It extends the GenericServlet base class and provides an framework for handling the HTTP protocol. So, HttpServlet only supports HTTP
abstract class
abstract class Explain the concept of abstract class and it?s use with a sample program. Java Abstract Class An abstract class is a class that is declared by using the abstract keyword. It may or may not have
abstract class Explain the concept of abstract class and it?s use with a sample program. Java Abstract Class An abstract class is a class that is declared by using the abstract keyword. It may or may not have
Related to GenericServlet and HttpServlet
Related to GenericServlet and HttpServlet Que: Http Servlet extends Generic Servlet then Why both GenericServlet and HttpServlet implements Serializable interface ? GenericServlet and HttpServlet implement
Related to GenericServlet and HttpServlet Que: Http Servlet extends Generic Servlet then Why both GenericServlet and HttpServlet implements Serializable interface ? GenericServlet and HttpServlet implement
Abstract and Interface
declared in a Java interface is by default final. An abstract class may contain non...Abstract and Interface What is interface? When time is most suitable for using interface? Why we use interface instead of abstract? What
declared in a Java interface is by default final. An abstract class may contain non...Abstract and Interface What is interface? When time is most suitable for using interface? Why we use interface instead of abstract? What
Abstract and Interface
Abstract and Interface what is the difference between Abstract and Interface accurateatly
Abstract and Interface what is the difference between Abstract and Interface accurateatly
Can a class be declared as static?
Can a class be declared as static? Hi, Can a class be declared as static? thanks
Can a class be declared as static? Hi, Can a class be declared as static? thanks
ModuleNotFoundError: No module named 'declared'
ModuleNotFoundError: No module named 'declared' Hi, My Python... 'declared' How to remove the ModuleNotFoundError: No module named 'declared... to install padas library. You can install declared python with following
ModuleNotFoundError: No module named 'declared' Hi, My Python... 'declared' How to remove the ModuleNotFoundError: No module named 'declared... to install padas library. You can install declared python with following
ModuleNotFoundError: No module named 'declared'
ModuleNotFoundError: No module named 'declared' Hi, My Python... 'declared' How to remove the ModuleNotFoundError: No module named 'declared... to install padas library. You can install declared python with following
ModuleNotFoundError: No module named 'declared' Hi, My Python... 'declared' How to remove the ModuleNotFoundError: No module named 'declared... to install padas library. You can install declared python with following
Can a class be declared as protected?
Can a class be declared as protected? Hi, Can a class be declared as protected? thanks Hi, A class can't be declared as protected. only methods can be declared as protected. http://www.roseindia.net/java
Can a class be declared as protected? Hi, Can a class be declared as protected? thanks Hi, A class can't be declared as protected. only methods can be declared as protected. http://www.roseindia.net/java
Interface and Abstract class
Interface and Abstract class Difference between Interface and Abstract class? Give some example Difference Between Interface and Abstract Class 1)Main difference is methods of a Java interface are implicitly
Interface and Abstract class Difference between Interface and Abstract class? Give some example Difference Between Interface and Abstract Class 1)Main difference is methods of a Java interface are implicitly
Abstract class
Abstract class j An Abstract class is a base class which... with an abstract keyword. For more information, visit the following links: http://www.roseindia.net/help/java/a/java-abstract-class.shtml http://www.roseindia.net/java
Abstract class j An Abstract class is a base class which... with an abstract keyword. For more information, visit the following links: http://www.roseindia.net/help/java/a/java-abstract-class.shtml http://www.roseindia.net/java
Java Abstract Class Example
if the subclass doesn't do so then it must have also declared as abstract... be declared as follows : public abstract class AbstractClassDemo { // declare...Java Abstract Class Example In this section we will read about the Abstract
if the subclass doesn't do so then it must have also declared as abstract... be declared as follows : public abstract class AbstractClassDemo { // declare...Java Abstract Class Example In this section we will read about the Abstract
abstract class
abstract class abstract class AbstractClass{ } is possible and compile the class or any compile time error occur tell me the answer Blockquote
abstract class abstract class AbstractClass{ } is possible and compile the class or any compile time error occur tell me the answer Blockquote
abstract class
abstract class what is abstract class .why we use it or what is the need of this class? Abstract class is like base class which contains abstract method and cannot instantiated. Please go through
abstract class what is abstract class .why we use it or what is the need of this class? Abstract class is like base class which contains abstract method and cannot instantiated. Please go through
The abstract Keyword : Java Glossary
on classes and methods. In case of class declared with an abstract keyword... name); If a class is declared abstract type then its methods will be also declared abstract type. When a method is declared abstract, the method can
on classes and methods. In case of class declared with an abstract keyword... name); If a class is declared abstract type then its methods will be also declared abstract type. When a method is declared abstract, the method can
Abstract class
Abstract class Calendar cal=Calendar.getInstance() We know that Calendar is an abstract class so it can't be instantiated. So how we can say that cal is an instance of Calendar??? Beginner Question I suppose. Thanks in advace
Abstract class Calendar cal=Calendar.getInstance() We know that Calendar is an abstract class so it can't be instantiated. So how we can say that cal is an instance of Calendar??? Beginner Question I suppose. Thanks in advace
Abstract class and abstract method
Some key points about abstract methods are as following An abstract modifier identifies abstract classes and methods An abstract methods cannot be private because it defined in the other class. An abstract methods cannot
Some key points about abstract methods are as following An abstract modifier identifies abstract classes and methods An abstract methods cannot be private because it defined in the other class. An abstract methods cannot
Version of com.englishtown>vertx-mod-httpservlet dependency
List of Version of com.englishtown>vertx-mod-httpservlet dependency
List of Version of com.englishtown>vertx-mod-httpservlet dependency
HttpServlet reading XML from HttpRequest - XML
HttpServlet reading XML from HttpRequest Hi , My requirement is 1.Input to the HttpServlet will be the XML sent by upstream as HttpRequest.... HttpServlet should only read the XML from HttpRequest and put it to a string. Can any
HttpServlet reading XML from HttpRequest Hi , My requirement is 1.Input to the HttpServlet will be the XML sent by upstream as HttpRequest.... HttpServlet should only read the XML from HttpRequest and put it to a string. Can any
Abstract class,Abstract methods and classes
Abstract methods and classes ... so many times the word abstract. In java programming language the word abstract is used with methods and classes. Abstract MethodADS_TO_REPLACE_1
Abstract methods and classes ... so many times the word abstract. In java programming language the word abstract is used with methods and classes. Abstract MethodADS_TO_REPLACE_1
abstract class and interface - Java Beginners
or more abstract methods. An abstract method is a method that is declared...abstract class and interface what is the need for an abstract class? when should we use an abstract class? when should we use interface instead
or more abstract methods. An abstract method is a method that is declared...abstract class and interface what is the need for an abstract class? when should we use an abstract class? when should we use interface instead
What if the main() method is declared as private?
What if the main() method is declared as private? Hi, What if the main() method is declared as private? Thanks Hi, I have found some reference site for java programming coding for Main() method is declared
What if the main() method is declared as private? Hi, What if the main() method is declared as private? Thanks Hi, I have found some reference site for java programming coding for Main() method is declared
Why Abstract Class?
Why Abstract Class? What is the use of Abstract Class if it has Zero Abstract methods
Why Abstract Class? What is the use of Abstract Class if it has Zero Abstract methods
Why Abstract Class?
Why Abstract Class? What is the use of Abstract Class if it has Zero Abstract methods
Why Abstract Class? What is the use of Abstract Class if it has Zero Abstract methods
Can a main method be declared final?
Can a main method be declared final? Hi, Can a main method be declared final? Thanks Hi, Yes we can. The final method can... be override in a subclass. for more about main method be declared final in Java
Can a main method be declared final? Hi, Can a main method be declared final? Thanks Hi, Yes we can. The final method can... be override in a subclass. for more about main method be declared final in Java
Why is the main method declared static?
Why is the main method declared static? Hi, Why is the main method declared static? thanks Hi, When we declare main() method in any... without creating any instance for the java class, where we declared it. Any static
Why is the main method declared static? Hi, Why is the main method declared static? thanks Hi, When we declare main() method in any... without creating any instance for the java class, where we declared it. Any static
Maven Dependency vertx-mod-httpservlet >> 0.1.0
You should include the dependency code given in this page to add Maven Dependency of com.englishtown >> vertx-mod-httpservlet version0.1.0 in your project
You should include the dependency code given in this page to add Maven Dependency of com.englishtown >> vertx-mod-httpservlet version0.1.0 in your project
Abstract programs - Java Beginners
Abstract programs give me the Abstract Methods programms and defind the Abstract Method and Abstract Class Hi friend, This code will help you. abstract class A{ public abstract abs_value
Abstract programs give me the Abstract Methods programms and defind the Abstract Method and Abstract Class Hi friend, This code will help you. abstract class A{ public abstract abs_value
abstract method in php - PHP
abstract method in php How do i implement the abstract method in php? Which is the best way
abstract method in php How do i implement the abstract method in php? Which is the best way
Interface vs abstract class
Interface vs abstract class Hai, Is there any possible to defining abstract methods in Interface
Interface vs abstract class Hai, Is there any possible to defining abstract methods in Interface
What is use of a abstract variable?
What is use of a abstract variable? Hi, What is use of a abstract variable? thanks
What is use of a abstract variable? Hi, What is use of a abstract variable? thanks
Ads
