What are some examples of encapsulation in Java OOP?

What are some examples of encapsulation in Java OOP?

Encapsulation in Java OOP is the bundling of data and methods that operate on that data within a single unit, typically a class. For example, consider a class BankAccount that has private fields for account balance and account number, and public methods to deposit and withdraw money.

Can you show me the code for that BankAccount class?

Sure! Here's a simple implementation:

public class BankAccount {
    private double balance;
    private String accountNumber;

    public BankAccount(String accountNumber) {
        this.accountNumber = accountNumber;
        this.balance = 0.0;
    }

    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
        }
    }

    public void withdraw(double amount) {
        if (amount > 0 && amount <= balance) {
            balance -= amount;
        }
    }

    public double getBalance() {
        return balance;
    }
}

This class encapsulates the balance and account number, providing methods to interact with them.

What are the benefits of using encapsulation?

Encapsulation provides several benefits: it protects the internal state of an object, reduces complexity by hiding implementation details, and enhances code maintainability and flexibility. It also allows for controlled access to the data through public methods.

Can you give another example of encapsulation?

Certainly! Another example could be a Person class that encapsulates personal information like name and age. It can have private fields and public methods to get and set these values, ensuring that the data is accessed and modified in a controlled manner.