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2. intro to java
- 1. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Introduction To Java Fresher’s 2016
- 2. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Characteristics of Java Architectural Neutral High Performance Distributed Portable Secure Robust Object Oriented ?? 2
- 3. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Object Oriented Language Fully support Encapsulation and Abstraction Must support Inheritance Must support Polymorphism All predefined must be Objects All user defined types must be Objects All operations performed on objects must only be through methods exposed by object. 3
- 4. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Object Oriented Features of Java • Encapsulation • Implements information hiding and modularity (abstraction) • Polymorphism • Same message sent to different objects results in behavior that's dependent on the object receiving the message • Inheritance • Define new classes and behavior based on existing classes to help code re-use. • Dynamic binding • You need to be able to send messages to objects without having to know their specific type at the time you write your code. 4
- 5. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Single Inheritance Model • Everything is derived from Object class. • https://docs.oracle.com/javase/7/docs/api/java/lang/package-tree.html • http://docstore.mik.ua/orelly/java-ent/jnut/figs/JN3_1201.gif • Except for few interfaces • Runnable • Serializable • Cloneable 5
- 6. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Some Important Classes • Class • Every class has an Class Object. • Throwable • Parent for Exception, Error • Runtime • Interact with the Runtime Environment • System • Loading libraries, I/O, Properties • ProcessBuilder • Create OS Process 6
- 7. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in • ClassLoader • Loads Classes, used by Security Manager • SecurityManager • Implements security policy • Package • Find information about loaded packages • Math • Mathematical functions 7 Some Important Classes Continued
- 8. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Q U E S T I O N S What’s Next • Data Types • Operators 8
- 9. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in 9 Thanks © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in 9
- 10. © Xebia IT Architects Pvt Ltd. 2014. Confidential: Not for Reproduction & Distribution. www.xebia.in Contact us at info@xebia.com
Editor's Notes
- the Java Compiler TM product generatesbytecodes--an architecture neutral intermediate format designed to transport code efficiently to multiple hardware and software platforms. The interpreted nature of Java technology solves both the binary distribution problem and the version problem; the same Java programming language byte codes will run on any platform.Architecture neutrality is just one part of a truly portable system. Java technology takes portability a stage further by being strict in its definition of the basic language. Java technology puts a stake in the ground and specifies the sizes of its basic data types and the behavior of its arithmetic operators. Your programs are the same on every platform--there are no data type incompatibilities across hardware and software architectures. The automatic garbage collector runs as a low-priority background thread, ensuring a high probability that memory is available when required, leading to better performance. Java technology's multithreading capability provides the means to build applications with many concurrent threads of activity. Multithreading thus results in a high degree of interactivity for the end user. While the Java Compiler is strict in its compile-time static checking, the language and run-time system are dynamic in their linking stages. Classes are linked only as needed. New code modules can be linked in on demand from a variety of sources, even from sources across a network.
- Static variables Primitive data types Primitive operators like +
- Static variables Primitive data types Primitive operators like +
- Static variables Primitive data types Primitive operators like +
- Static variables Primitive data types Primitive operators like +
- Static variables Primitive data types Primitive operators like +
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