JAVA BASIC CONCEPTS WITH EXAMPLES PDF
them understand the basic to advanced concepts related to Java Programming language. languages. Execute Java Online. For most of the examples given in this tutorial, you will find a 'Try it' option, which you . Java – Basic Syntax. This book is intended for people with at least some basic programming back- ground, which During each week, you'll read seven chapters that present concepts related to the. Java For example, a printing code of shows that the. runtime. The following diagram shows an example of the Java compilation and The basic structure of an applet that uses each of these predefined methods is.
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Object oriented Programming Languages Working upon Object hence it is known as object oriented programming language. It separates the code logically using classes.
The basic idea behind object-oriented programming is to create Object in code, the object that has different Properties and Methods. Class is a collection of properties and Methods.
In a class, we can define access specifies of class Members. We can Say Class is a template for objects. Class is the keyword and class name is the unique name of the class. Same like class we define methods and variables using Access specifier and data type, where data type is a type of variable which kind of value going to be store.
What is OOPS?
And return type of methods indicates which kind of value method will return. In which the class name is Sample and it has public access specifier that indicates that this class can be accessed from anywhere in the package and another package. Sample class has 2 variables and 1 method that are known as Data Member of class. It is accessible in current package. This is the common structure of class in Java. Object: Object is commonly an instance of a class.
In java Object is also known as instance. Every object in java has its own state.
10 Free Java Programing Books for beginners - download, pdf and HTML
So if we declare two object x and y then both object has different state. It offers robust and natural mechanism for organizing and structure of any software.
For example, in English, the verb run has a different meaning if you use it with a laptop , a foot race , and business. Here, we understand the meaning of run based on the other words used along with it.
The same also applied to Polymorphism. It is a technique of creating a new data type that is suited for a specific application. For example, while driving a car, you do not have to be concerned with its internal working. Here you just need to concern about parts like steering wheel, Gears, accelerator, etc.
In this OOPS concept, the variables of a class are always hidden from other classes. It can only be accessed using the methods of their current class. For example - in school, a student cannot exist without a class. It defines the diversity between objects. In this OOP concept, all object have their separate lifecycle, and there is no owner.
For example, many students can associate with one teacher while one student can also associate with multiple teachers. It is also called "death" relationship. Child objects do not have their lifecycle so when parent object deletes all child object will also delete automatically. Any house can have several rooms. So, if you delete the house room will also be deleted. Advantages of OOPS: OOP offers easy to understand and a clear modular structure for programs.
Objects created for Object-Oriented Programs can be reused in other programs. Thus it saves significant development cost. Large programs are difficult to write, but if the development and designing team follow OOPS concept then they can better design with minimum flaws. It also enhances program modularity because every object exists independently. Programming languages can be classified into 3 primary types Unstructured Programming Languages: The most primitive of all programming languages having sequentially flow of control.
Code is repeated through out the program Structured Programming Languages: Has non-sequentially flow of control. Use of functions allows for re-use of code.
Object Oriented Programming: Click here if the video is not accessible. Let's understand these 3 types with an example. Suppose you want to create a Banking Software with functions like Deposit Withdraw Show Balance Unstructured Programming Languages The earliest of all programming language were unstructured programming language.Real-world objects share two characteristics: They all have state and behavior.
Though this is the tried and tested approach and working well from a long time, it can be improved. It is also called "death" relationship.
Example: A dog is an object because it has states like color, name, breed, etc. OOP offers easy to understand and a clear modular structure for programs.
An Object can be defined as an instance of a class.
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