static block in java

Started by mk12345, 11-09-2013, 01:22:09

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mk12345Topic starter

what is static synchronization in java language.
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MarcoLeitner

#1
Static synchronization in Java refers to the use of the `synchronized` keyword to coordinate access to static methods or code blocks by multiple threads. When a method or code block is declared as `synchronized` and is associated with a static context, it means that only one thread can execute that method or block at a time. This prevents multiple threads from accessing the shared resource simultaneously, which can lead to data inconsistencies or race conditions.

By using static synchronization, you can ensure that critical sections of code within static methods or blocks are accessed in a mutually exclusive manner, thus avoiding concurrent interference and maintaining data integrity. It's important to note that static synchronization locks on the class itself, rather than on an instance of the class, so it affects all instances of the class.

Here's an example of using static synchronization in Java:

public class MyClass {
    private static int sharedVariable = 0;

    public static synchronized void incrementVariable() {
        sharedVariable++;
    }

    public static void someMethod() {
        synchronized (MyClass.class) {
            // Critical section of code
            // ...
        }
    }
}


In this example, the `incrementVariable` method is declared as `synchronized`, ensuring that only one thread can execute it at a time, preventing concurrent updates to the `sharedVariable`. The `someMethod` also uses static synchronization by explicitly synchronizing on the `MyClass.class` object to protect its critical section of code.






java support a special block called Static block which can be used for static initialization of a class. What ever code we write in a static block can be executed only once. Static block is also called a static initialization block.Its a normal block of code  enclosed in a {} and preceded by a static keyword.a class can also have any number of static initialization block.