Advanced Java

When learned the java with the advanced concepts ,the

application can be created for all the domain.Using the

J2EE will be more friendly and efficiency in the code

maintenance, since part of the code will be from the

framework

Because, it would be really difficult to specify the connection details in every method that access the database. Instead, if we create a data source, it can be used to connect to the database in every method we want.

yes you can have and if you specify different url patter

like

*.do for one action servlet

*.abc for other action servlet

in your web.xml file

There are many thing we can do in hinernate automaticaly by

hibernate tools or seting hibernate properties.some I

giving below:

(1) We can migrate database just change database dielect.

(2)we can used caching

(3)if user do not know ant any SQL languge then they can

use criteria query.

(4)There is one scnerio where SQL query are failed when

want fetch obejct from db but do not know there ID.

Hibernate provide this solution using HSQL.

If you change the state of an object, you ask it to perform

a behavior. An object stores its states in a field e.g.

variables, and demonstrates its behavior through methods.

No,java is not fully object oriented language because it does not support "multiple inheritence" and "pointers" which are used in C++.But,by using Interfaces we can implement multiple inheritence.Also,due to presence of Primitive datatypes,which are used in (AutoBoxing)...we can say it is not fully object oriented language.

Pass by value.

1. When passing primitives, it passes a copy of the

variable to the method. Any change made in the method does

not reflect in the calling method.

2. When dealing with objects, a copy of their

reference/address is passed. Thus the change made to the

object is reflected in the calling method.

public someClass{

public synchronised methodA(){

//write your code

}

}

Struts:

1.Struts is only for web Applications.We can not develop any

type of Java,J2EE applications by using Struts Framework.

2.We can not Integrate other Frameworks with Any other Java

Oriented Frameworks.

Spring:

1.Spring is for developing any kind of Java,J2EE applications.

2.It is Layered architecture.We can integrate any no of

Frameworks with Spring.

3.It has So many features like AOP,IOC.

When multiple threads working,Synchronization is to lock a method for a particular object.

yes, you will be overriding to throw a different exception

struts-config.xml in this file.

under the tag <type> absolute path of Action class

under the tag <name> name of the action form class

Both of this will be called when the desired action

mentioned under the <path> tag will be called and

struts-config.xml will call action class mentioned in the

<type> tag and also populate the fields of form class

mentioned under <name> tag.

It will give compilation error. In order to define a method

in JSP, it should be defined in the JSP declarations <%!..%

>, and it can be called in the JSP expression.

On translation, the method will be added outside all

methods in the servlet class.

init(),service(),destroy()

jspinit(),_jspService(),jspdestroy()

Separating your business logic with other functionalit

y such as services,Loggers etc,Making classess more cohesive.

Unchecked and Checked exceptions

Inhertitance, Encapsulation, Polymorphism, Data Abstraction

Spring is lightweight,Inversion controlled,Aspect oriented ,Container framework.

Injecting dependencies to object itself instead of depending on container.