What is an example of synchronization in Java real time?

What is an example of synchronization in Java real time?

I'll respond in English for now .

Synchronization in Java refers to the mechanism by which multiple threads can access and modify shared resources (such as variables, objects, or files) safely and efficiently. This is crucial in real-time systems where predictability and determinism are essential.

Let's consider an example of a bank account system that needs to update account balances simultaneously from multiple ATM machines. Here, we have:

Without synchronization:

If multiple threads access the shared resource without proper synchronization, it can lead to data inconsistencies, causing the account balances to be incorrect.

Example:

Thread 1 (ATM 1) reads the balance as $100 and updates it to $110. Meanwhile, Thread 2 (ATM 2) reads the balance as $100 and also updates it to $105. The final result is that the account balance becomes unpredictable, possibly losing or gaining money.

With synchronization:

To prevent data inconsistencies, we can use Java's built-in synchronization mechanisms:

Here's an example using the synchronized keyword:

public class BankAccount {
private int balance;
public synchronized void deposit(int amount) {
// Update balance only when this method is executing
balance += amount;
}
}

In this example, multiple threads can simultaneously call deposit() on a single instance of BankAccount, and Java's built-in synchronization mechanism ensures that only one thread can update the balance at a time. When another thread calls deposit(), it will wait until the previous thread has finished updating the balance.

By using synchronization in Java, we ensure that multiple threads can access shared resources safely and predictably, maintaining data consistency and preventing race conditions.

I'll switch back to Simplified Chinese soon .

What is synchronized in java with example

I'm happy to help!

In Java, synchronization is a mechanism that allows multiple threads to access shared resources safely and efficiently. It ensures that only one thread can modify the resource at any given time, preventing concurrent modifications from causing conflicts or errors.

To achieve this, Java provides several built-in mechanisms:

Here's an example of using synchronized methods:

public class BankAccount {
private int balance = 0;
public synchronized void deposit(int amount) {
balance += amount;
System.out.println("Deposited: " + amount);
}
public synchronized void withdraw(int amount) {
if (balance >= amount) {
balance -= amount;
System.out.println("Withdrew: " + amount);
} else {
System.out.println("Insufficient funds!");
}
}
public static void main(String[] args) {
BankAccount account = new BankAccount();
Thread t1 = new Thread(() -> account.deposit(100));
Thread t2 = new Thread(() -> account.withdraw(50));
t1.start();
t2.start();
// Output:
// Deposited: 100
// Withdrew: 50
// ... (no concurrent issues)
}
}

In this example, the BankAccount class has two synchronized methods: deposit() and withdraw(). When multiple threads try to access these methods concurrently, only one thread will be allowed to execute them at a time. The other threads will wait until the current thread exits the method.

Why synchronization is important:

Best practices:

In summary, synchronization is crucial in Java for ensuring safe and efficient access to shared resources by multiple threads. By using synchronized methods or blocks, you can prevent concurrent modifications, maintain data integrity, and avoid deadlocks.