What is the significance of the synchronized keyword When should methods be synchronized This guarantees that changes to the state of the object are visible to all threads have a look at this documentation page to understand intrinsic locks and lock behavior. Tengo que realizar un proyecto en el que se sincronicen 10 hilos, en el cual son hay 5 hilos de ping y 5 hilos de pong Uno debe de imprimir ping, y otro pong y lo deben de imprimir alternadame. When we use this block, we mean that we are willing to wait until the thread using this monitor, releases it.
3 synchronized has two effects First, it is not possible for two invocations of synchronized methods on the same object to interleave When one thread is executing a synchronized method for an object, all other threads that invoke synchronized methods for the same object block (suspend execution) until the first thread is done with the object. Entering a synchronized block, taking out a lock and reading from a volatile are all considered as an acquire and the release of a lock, exiting a synchronized block and writing a volatile are all forms of a release. When multiple locks are acquired they must be released in the opposite order, and all locks must be released in the same lexical scope in which. In order to guarantee serial access, it is critical that all access to the backing list is accomplished through the returned list
Difference between synchronized block and synchronized method are following Synchronized block reduce scope of lock, but synchronized method's scope of lock is whole method. Declare both run and dojob synchronized This will use this as lock Declare list as final and synchronize on it This will use list as lock
Declaring lock field as final is good practice This way some methods of your class my synchronize on one object, while other methods can use other object for synchronization.
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