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This section is a brief hands-on introduction to using Eclipse for Java development. The Eclipse development environment The Eclipse development environment has four main components: Workspace Perspectives Views The primary unit of organization in Eclipse is the workspace.
A workspace contains all of your projects. A perspective is a way of looking at each project hence the name , and within a perspective are one or more views.
Figure 2 shows the Java perspective, which is the default perspective for Eclipse. You see this perspective when you start Eclipse. Figure 2. Eclipse Java perspective The Java perspective contains the tools that you need to begin writing Java applications.
Each tabbed window shown in Figure 2 is a view for the Java perspective. Package Explorer and Outline are two particularly useful views. The Eclipse environment is highly configurable. Each view is dockable, so you can move it around in the Java perspective and place it where you want it. For now, though, stick with the default perspective and view setup.
Figure 3. New Java Project wizard Enter Tutorial as the project name and use the workspace location that you opened when you opened Eclipse. Click Finish to accept the project setup and create the project. You have now created a new Eclipse Java project and source folder. Your development environment is ready for action.
Object-oriented programming concepts and principles The Java language is mostly object oriented. This section is an introduction to OOP language concepts, using structured programming as a point of contrast. What is an object? Object-oriented languages follow a different programming pattern from structured programming languages like C and COBOL.
The structured-programming paradigm is highly data oriented: You have data structures, and then program instructions act on that data.
Object-oriented languages such as the Java language combine data and program instructions into objects. An object is a self-contained entity that contains attributes and behavior, and nothing more.
Instead of having a data structure with fields attributes and passing that structure around to all of the program logic that acts on it behavior , in an object-oriented language, data and program logic are combined.
This combination can occur at vastly different levels of granularity, from fine-grained objects such as a Number, to coarse-grained objects, such as a FundsTransfer service in a large banking application.
Parent and child objects A parent object is one that serves as the structural basis for deriving more-complex child objects. A child object looks like its parent but is more specialized. With the object-oriented paradigm, you can reuse the common attributes and behavior of the parent object, adding to its child objects attributes and behavior that differ.
Object communication and coordination Objects talk to other objects by sending messages method calls, in Java parlance. In this way, data insecurity is created. To overcome this problem, programmers developed the concept of encapsulation. For example, let us have a struc.
It is sure that all the twenty functions will not use all the global variables. Three of the global variables may be used only by two functions.
But in a structured prog. Every function will have access to all the global variables. To avoid this problem, programmers have designed a way such that the variables and the functions which are associated with or operate on those variables are enclosed in a block and that bock is called a class and that class and that class is given a name, Just as a function is given a name.
Now the variables inside the block cannot be called as the local variable because they cannot be called as global variables because they are confined to a block and not global. Hence these variables are known as instance variables Ex :.
In Java, EJB is used for creating enterprise applications. Mobile Application - Java is used to create application software for mobile devices. Currently, Java ME is used for building applications for small devices, and also Java is a programming language for Google Android application development.
Features of Java Object-Oriented - Java supports the features of object-oriented programming.
Its object model is simple and easy to expand. Secure - Java provides a wide range of protection from viruses and malicious programs.
It ensures that there will be no damage and no security will be broken. Portable - Java provides us with the concept of portability. Running the same program with Java on different platforms is possible. Multi-threaded - The multithreading programming feature in Java allows you to write a program that performs several different tasks simultaneously.