Encapsulation means binding the datamembers with in the class. For binding the datamembers members should be private.
Encapsulation is one of the four fundamental OOP concepts. The other three OOPs concept are inheritance, polymorphism, and abstraction.
What is Encapsulation ?
Encapsulation in Java is a mechanism of wrapping the code and data (variables)acting on the data (methods) together as a single unit. In encapsulation, the variables of a class will be hidden from other classes, and can be accessed only through the methods of their current class. Therefore, it is also known as data hiding.
How can we achieve the encapsulation ?
– Declare the variables of a class as private. Java /j2ee classes bangalore
-Provide public setter and getter methods to modify and view the variables values.
Why datamembers should be private ?
Private Datamembers are only accessible with in the class . Private members can’t be access outside the class.We can access the private members outside the class using getter and setter method.
Why we used Encapsulation ?
– To make the fields of a class can be made read-only or write-only.
– A class can have total control over what is stored in its fields.
– The users of a class do not know how the class stores its data. A class can change the data Advanced java training in bangalore type of a field and users of the class do not need to change any of their code.
1.Objects encapsulate data and implementation details. To the outside world, an object is a black box that exhibits a certain behavior.
2.The behavior of this object is what which is useful for the external world or other objects.
3.An object exposes its behavior by means of public methods or functions.
4.The set of functions an object exposes to other objects or external world acts as the interface of the object.
More about Encapsulation :
– In Java , encapsulation is used to bind the data with its related functionalities. Here functionalities mean “methods” java course in bangalore and data means “variables”
So keep ing variable and methods in one place. That place is known as “class.”
– Class is the base for encapsulation.
– With Encapsulation, we can hide (restrict access) to critical data members in our code, which improves security
-if a data member is declared “private”, then it can only be accessed within the same class. No outside class can access data member (variable) of other class.
– However if we need to access these variables, we have to use public “getter” and “setter”methods.
-Setup public “getter” and “setter” method to update and read the private data field. This will allow data access from private class. Best core java training in bangalore
Getters Method and Setters Method :
In Java getters and setters are completely ordinary functions. The only thing that makes them getters or setters is convention. A getter for demo is called getDemo and the setter is called setDemo .
In the case of a boolean, the getter is called isDemo .
We can set as well as get value from variables so these are called setter and getter methods.
so declare variables as private to prevent from accessing directly using object of the class. and use get and set methods in java like
setVariableName() and getVariableName() to assign values and access variables .
1. Purpose of Setter method is to set new value or assign new value to instance variable .
2. Method name should follow naming convention setVARIABLENAME().
3. It should accept some value as an argument. here method argument should be of type of variable.
4. It should have a statement to assign argument value to corresponding variable.
5. It does not have any return type. void should be the method return type.
6. In order to set some value to variable we need to call corresponding setter method by passing required value.
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