What is an abstraction in java javatpoint

What is an abstraction in java javatpoint

I'm glad you asked!

In Java, an abstraction is a mechanism that allows us to show only the necessary information about an object while hiding its implementation details. In other words, it's a way to focus on what an object does rather than how it does it.

To understand this better, let's take an example of a Bank Account class in Java:

public class BankAccount {
private int balance = 0;
public void deposit(int amount) {
balance += amount;
}
public void withdraw(int amount) {
if (balance >= amount) {
balance -= amount;
}
}
public int getBalance() {
return balance;
}
}

In this example, the BankAccount class has three methods: deposit, withdraw, and getBalance. These methods allow us to interact with a bank account (e.g., deposit money, withdraw money, check the balance). The implementation details of these methods are hidden from the outside world, which is an abstraction.

The abstraction in this case allows us to focus on what we can do with our bank account (deposit, withdraw, and get the balance) rather than how it's implemented. For instance:

public class Main {
public static void main(String[] args) {
BankAccount myAccount = new BankAccount();
// Deposit some money
myAccount.deposit(100);
// Check the balance
int balance = myAccount.getBalance();
System.out.println("Current balance: " + balance);
// Withdraw some money
myAccount.withdraw(50);
// Check the balance again
balance = myAccount.getBalance();
System.out.println("Current balance: " + balance);
}
}

In this example, we can use a BankAccount object without knowing how it stores and updates the balance. We only care about what methods are available to interact with our bank account.

Abstraction provides several benefits:

In conclusion, abstraction in Java is an essential mechanism that helps us focus on what an object does rather than how it does it, making our code more modular, reusable, and easier to maintain.

What is an abstraction in java w3schools

I'd be happy to help! However, please note that W3Schools is a web development platform that focuses on HTML, CSS, JavaScript, and other web technologies, not Java specifically. But I'll provide you with information about abstraction in the context of programming languages, including Java.

In programming, an abstraction is a concept or idea that represents complex systems, processes, or data structures in a simplified and manageable way. Abstraction allows developers to focus on essential features while hiding unnecessary details, making code more efficient, readable, and maintainable.

In object-oriented programming (OOP), such as Java, an abstraction can be achieved through encapsulation, inheritance, and polymorphism. Here's how:

By using these abstraction techniques, Java developers can:

Here's an example of how you might use abstraction in a simple banking system using Java:

// Abstract class: BankAccount
public abstract class BankAccount {
private double balance;
public BankAccount(double initialBalance) {
this.balance = initialBalance;
}
public void deposit(double amount) {
balance += amount;
}
public void withdraw(double amount) {
if (amount <= 0 || amount > balance) {
throw new InsufficientFundsException();
}
balance -= amount;
}
public double getBalance() {
return balance;
}
}
// Concrete class: CheckingAccount
public class CheckingAccount extends BankAccount {
private int overdraftLimit;
public CheckingAccount(double initialBalance, int overdraftLimit) {
super(initialBalance);
this.overdraftLimit = overdraftLimit;
}
@Override
public void withdraw(double amount) {
if (amount > getBalance() + overdraftLimit) {
throw new OverdraftException();
}
super.withdraw(amount);
}
}

In this example:

This abstraction helps you focus on the essential behavior of a checking account (e.g., depositing, withdrawing) while hiding internal implementation details.