encapsulation program in java

Published: 03 December 2024
on channel: CodeMore

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encapsulation in java: a tutorial

*what is encapsulation?*

encapsulation is one of the four fundamental object-oriented programming (oop) concepts. it refers to the bundling of data (attributes) and methods (functions) that operate on that data into a single unit or class. encapsulation restricts direct access to some of an object’s components, which can prevent the accidental modification of data. this is typically achieved using access modifiers.

*benefits of encapsulation:*
1. *control:* you can control how the data is accessed and modified.
2. *flexibility and maintenance:* changes in the implementation of a class can be made without affecting other parts of the program.
3. *increased security:* sensitive data can be hidden from outside interference and misuse.
4. *improved code readability:* encapsulation makes the code cleaner and easier to understand.

how to implement encapsulation

1. *declare variables as private:* this restricts direct access to the class attributes.
2. *provide public methods (getters and setters):* these methods allow controlled access to the private variables.

example code

let’s create a simple example of a `bankaccount` class to demonstrate encapsulation.

using the `bankaccount` class

now, let’s create a main class to demonstrate how we can use the `bankaccount` class with encapsulation.

explanation of the code

1. *private variables:*
`accountholdername` and `balance` are declared as private, meaning they can't be accessed directly from outside the class.

2. *constructor:*
the constructor initializes the account holder's name and the initial balance.

3. *getters:*
`getaccountholdername()` and `getbalance()` methods provide controlled access to the private variables.

4. *methods for operations:*
`deposit(double amount)` allows adding money to the account but checks if the amount is positive.
`withdraw(double amount)` checks if the amount is valid and whether the bala ...

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