COMO PROGRAMAR EN JAVA DEITEL & DEITEL 7MA EDICION PDF

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Embed Size px x x x x It is estimated that estimated 1. This is 8. This is significant career opportunities for people who program mobile applications, many of which are programmed in Java Slide 6 Introduction to Java Java supported three programming paradigms procedural programming, object-oriented programming generic programming. Java Standart Edition Java SE 8 adds functional programming Java Enterprise Edition Java EE : large-scale, distributed networking applications and web-based applications Java Micro Edition Java ME : applications for resource- constrained embedded devices, such as smartwatches, MP3 players, television set-top boxes, smart meters for monitoring electric energy usage and more.

Slide 7 Object Technology Concepts Objects are reusable software components. There are date objects, time objects, audio objects, video objects, automobile objects, people objects, etc. Any noun can be represented as a software object in terms of attributes e. Development groups use object-oriented design- and-implementation approach to be much more productive than with earlier techniques Object-oriented programs are often easier to understand, correct and modify. Slide 8 Procedural vs. Object Oriented Procedural Calculate the area of a circle given the specified radius Sort this class list given an array of students Calculate the students GPA given a list of courses Object Oriented Circle, whats your radius?

Class list, sort your students Transcript, whats the students GPA? Slide 9 The Automobile as an Object You want to drive a car and make it go faster by pressing its accelerator pedal Before you can drive a car, someone has to design it. The drawings include the design for an accelerator pedal. A completed car has an actual accelerator pedal to make it go faster The car wont accelerate on its own, so the driver must press the pedal to accelerate the car.

Slide 10 Methods and Classes Performing a task in a program requires a method. The method hides these statements from its user. We create a program unit called a class to house the set of methods that perform the classs tasks. A class that represents a bank account might contain a few methods to deposit A class is similar in concept to a cars engineering drawings, which house the design of an accelerator pedal, steering wheel, and so on.

Slide 11 Instantiation Someone has to build a car before you can actually drive a car You must build an object of a class before a program can perform the tasks that the classs methods define. The process of doing this is called instantiation.

An object is then referred to as an instance of its class. Slide 12 Reuse Just as a cars engineering drawings can be reused many times to build many cars, you can reuse a class many times to build many objects. Reuse of existing classes when building new classes and programs saves time and effort. Reuse also helps you build more reliable and effective systems, Existing classes and components often have undergone extensive testing, debugging and performance tuning.

Slide 13 Messages and Method Calls When you drive a car, pressing its gas pedal sends a message to the car to perform a task. Similarly, you send messages to an object. Each message is implemented as a method call that tells a method of the object to perform its task.

For example, a program might call a bank- account objects deposit method to increase the accounts balance Slide 14 Attributes and Instance Variables A car has attributes, such as its color, its number of doors, the amount of gas in its tank, its current speed..

The cars attributes are represented as part of its design in its engineering diagrams As you drive an actual car, these attributes are carried along with the car. Every car maintains its own attributes. Each car knows how much gas is in its own gas tank, but not how much is in the other cars. Slide 15 Attributes and Instance Variables An object has attributes that it carries along as its used in a program. These attributes are specified as part of the objects class. For example. Attributes are specified by the classs instance variables.

Slide 16 Encapsulation and Information Hiding Classes and their objects encapsulate their attributes and methods. A classs and its objects attributes and methods are related. Objects may communicate with one another, but theyre normally not allowed to know how other objects are implemented Implementation details are hidden within the objects themselves.

Information hiding is important to good software engineering Slide 17 Inheritance A new class of objects can be created by inheritance The new class called the subclass starts with the characteristics of an existing class called the superclass possibly customizing them and adding unique characteristics of its own.

In the car analogy, an object of class is an object of the more general class automobile". Slide 18 Interfaces Collections of related methods that typically enable to tell objects what to do, but not how to do it. In the car analogy, basic-driving-capabilities interface consisting of a steering wheel, an accelerator pedal and a brake pedal would enable a driver to tell the car what to do.

Once you know how to use this interface, you can drive many types of cars, even though manufacturers may implement these systems differently. Slide 19 Interfaces A class implements zero or more interfaces, each of which can have one or more method A car implements separate interfaces for basic driving functions, controlling the radio, controlling the heating,air conditioning systems Manufacturers implement capabilities differently, classes may implement an interfaces methods differently.

Software system may include a backup interface that offers the methods save and restore. Classes may implement methods differently, depending on the types of things being backed up, such as programs, text, audios, videos, etc. Slide 20 Open Source Software The Linux operating system is popular in servers, personal computers and embedded systems The opensource software development style departs from the proprietary style used, for example, with Microsofts Windows and Apples Mac OS X.

Individuals and companies contribute their efforts in developing, maintaining and evolving software. Anyone can use and customize it for their own purposes, typically at no charge. Some organizations in the open-source community: Eclipse Foundation the Eclipse Integrated Development Environment Mozilla Foundation creators of the Firefox web browser , Apache Software Foundation creators of the Apache web server that delivers web pages over the Internet in response to web-browser requests GitHub and SourceForge which provide the tools for managing open-source projects Slide 22 Android Android is based on the Linux kernel and uses Java The Android operating system was developed by Android, Inc.

Java became important by business community because of the interest in the web. Java is now used to develop large-scale enterprise applications to enhance the functionality of web servers to provide applications for consumer devices cell phones, smartphones, television set-top boxes and more.. Sun Microsystems was acquired by Oracle in Slide 25 Java Class Libraries You can create each class and method you need to form your Java programs.

Java programmers take advantage of the rich collections of existing classes and methods. Post on Dec views. Category: Documents 15 download.

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Embed Size px x x x x It is estimated that estimated 1. This is 8. This is significant career opportunities for people who program mobile applications, many of which are programmed in Java Slide 6 Introduction to Java Java supported three programming paradigms procedural programming, object-oriented programming generic programming.

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