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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.

"This Tech Tip presents some of the features of inheritance supported in the Java Persistence API. A sample package accompanies the Tech Tip. It demonstrates some of the features discussed in the tip. The examples in the tip are taken from the source code for the sample (which is included in the package). The sample uses an open source reference implementation of Java EE 5 called GlassFish. You can download GlassFish from the GlassFish Community Downloads page."

Hibernate Tutorial. In this hibernate tutorial, we will learn basics of hibernate, inheritance mapping, collection mapping, component mapping, HQL, HCQL, Named Query, Caching and Integration of Hibernate with other frameworks.

Package java.util.concurrent.atomic Description A small toolkit of classes that support lock-free thread-safe programming on single variables. In essence, the classes in this package extend the notion of volatile values, fields, and array elements to those that also provide an atomic conditional update operation of the form: boolean compareAndSet(expectedValue, updateValue);

Core Java Topics - Overview Of Programming With Java, Datatypes, Variables, Operators, Control Statements, Methods - Importance, Array - Overview, Classes, Class Inheritance, Methods Overiding and Overloading, Abstract Class And Methods, Interfaces, Packages and Access Control, final, static and others, Object Oriented Concepts - Revisited, Exceptions, Generics, Strings, Exploring java.lang, Collections Framework, More Utility Classes, Input/Output: Exploring java.io, Other Core Java Topics

There are two ways to create threads. 1. Create Threads implementing Runnable interface 2. Create Threads Extending Thread class When to use Runnable interface Use Runnable interface when your class is extending some other class. Since in Java mulitple inheritance is not possible we use Runnable interface to create Threads.

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

An interface is a blueprint of a class. It has static constants and abstract methods. The interface is a mechanism to achieve fully abstraction in java. There can be only abstract methods in the interface. It is used to achieve fully abstraction and multiple inheritance in Java. Interface also represents IS-A relationship.

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

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