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There are two types of modifiers in java: access modifier and non-access modifier. The access modifiers specifies accessibility (scope) of a datamember, method, constructor or class. There are 4 types of access modifiers: There are many non-access modifiers such as static, abstract, synchronized, native, volatile, transient etc. Here, we will learn access modifiers.

A package is a group of similar types of classes, interfaces and sub-packages. Package can be categorized in two form, built-in package and user-defined package. There are many built-in packages such as java, lang, awt, javax, swing, net, io, util, sql etc. Here, we will have the detailed learning of creating and using user-defined packages.

Runtime Polymorphism. Let's learn what is runtime polymorphism with suitable example.

The final keyword in java is used to restrict the user. The final keyword can be used in many context. Final can be: variable method class The final keyword can be applied with the variables, a final variable that have no value it is called blank final variable or uninitialized final variable.

Having the same method in the subclass as declared in the parent class is known as method overriding. In other words, If subclass provides the specific implementation of the method i.e. already provided by its parent class, it is known as Method Overriding.

Advantage of OOPs Naming Convention Object and Class Method Overloading Constructor static keyword this keyword Inheritance(IS-A) Aggregation(HAS-A) Method Overriding Covariant Return Type super keyword Instance Initializer block final keyword Runtime Polymorphism Dynamic Binding instanceof operator Abstract class Interface Package Access Modifiers Encapsulation Object class Object Cloning Java Array Call By Value strictfp keyword API Document Command Line Arg

Advantage of OOPs Naming Convention Object and Class Method Overloading Constructor static keyword this keyword Inheritance(IS-A) Aggregation(HAS-A) Method Overriding Covariant Return Type super keyword Instance Initializer block final keyword Runtime Polymorphism Dynamic Binding instanceof operator Abstract class Interface Package Access Modifiers Encapsulation Object class Object Cloning Java Array Call By Value strictfp keyword API Document Command Line Arg

Normally, array is a collection of similar type of elements that have contigious memory location. In java, array is an object the contains elements of similar data type. It is a data structure where we store similar elements. We can store only fixed elements in an array.

A class that is declared with abstract keyword, is known as abstract class. Before learning abstract class, let's understand the abstraction first. Abstraction Abstraction is a process of hiding the implementation details and showing only functionality to the user.

Variable and Datatype in Java. Variable is a reserved area allocated in memory.There are three types of variable local,instance and static.There are 8 primitive data types.

Inheritance is a mechanism in which one object acquires all the properties and behaviours of parent object. The idea behind inheritance is that you can create new classes that are built upon existing classes. When you inherit from an existing class, you reuse (or inherit) methods and fields, and you add new methods and fields to adapt your new class to new situations.

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The short answer is that Qi4j is a framework for domain centric application development, including evolved concepts from AOP, DI and DDD. Qi4j is an implementation of Composite Oriented Programming, using the standard Java 5 platform, without the use of

"Welcome to the home of Spring, the leading platform to build and run enterprise Java applications. Led and sustained by SpringSource, Spring delivers significant benefits for many projects, increasing development productivity and runtime performance while improving test coverage and application quality."

The Aries project is delivering a set of pluggable Java components enabling an enterprise OSGi application programming model. This includes implementations and extensions of application-focused specifications defined by the OSGi Alliance Enterprise Expert Group (EEG) and an assembly format for multi-bundle applications, for deployment to a variety of OSGi based runtimes. The OSGi R4 V4.2 Enterprise Specification can be found here: http://www.osgi.org/Download/Release4V42 To understand the complete scope of the Aries project, see the Aries proposal document on the incubator wiki.

Tutorial and Example on how to integrate Java, Spring, Hibernate and MySQL

Sample of using Hibernate Annotations by reducing XML configuration files thus making it simpler to define required metadata directly into our Java code. When using annotations, we no longer need the additional mapping file (*.hbm.xml). The metadata for the ORM is specified in the individual classes.

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