Synchronized keyword in java

• About Synchronization
• How to synchronize in android using kotlin
• Synchronisation: Using the class instance as monitor object
• Synchronisation: Two instances using the same monitor object

About Synchronization

• Java Synchronized block is a block of Java code that can be executed by only one thread at a time.
• Monitor object ensures that no two threads can access a block of code, If that scenario arises, The monitor object makes it synchronised
• Assume that There are two methods in a class say getter & setter methods, and both the functions are synchronised in the same monitor object. Now if one thread is trying to access one of the functions, another thread is not able to access both of the functions in the class.
• Also remember if two separate instances are created for two different objects and the monitor object is on the instance of the created objects, the accessibility of threads depends on the instance.

How to synchronize in android using kotlin

1. Using the @Synchronized annotation: @Synchronized annotation This annotation marks a method as synchronized, ensuring that only one thread can execute it at a time. It acts as a shorthand for using a synchronized block with this object as the lock.

class MyClass {
    @Synchronized
    fun synchronizedFunction() {
        // Code that needs to be synchronized
    }
}

2. Using a synchronized block: This approach provides more control over synchronization. You explicitly specify a lock object, and only one thread can acquire the lock and execute the code within the block at a time.

class MyClass {
    private val lock = Any() // Use a dedicated lock object

    fun synchronizedFunction() {
        synchronized(lock) {
            // Code that needs to be synchronized
        }
    }
}