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Example, in future, you only need synchronized a part of method. Example, you have 2 synchronized method and it don't have any relevant to each other, however when a thread run a method, it will block the other method (it can prevent by use synchronized(a variable)). However, apply synchronized method is simple and the code look simple.
Even though the code works correctly when the private method is not synchronized, it would seem prudent from a maintainability perspective to make the private method synchronized. Intrinsic locks are re-entrant, there is no harm in adding the synchronized keyword to the private method.
Second, when a synchronized method exits, it automatically establishes a happens-before relationship with any subsequent invocation of a synchronized method for the same object. 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.
Second, when a synchronized method exits, it automatically establishes a happens-before relationship with any subsequent invocation of a synchronized method for the same object. This guarantees that changes to the state of the object are visible to all threads. So in short, it blocks any invocations of synchronised methods on the same object.
From Java 1.5 it's always a good Idea to consider java.util.concurrent package. They are the state of the art locking mechanism in java right now. The synchronize mechanism is more heavyweight that the java.util.concurrent classes. The example would look something like this:
The synchronized block implements its synchronization through a sequence of bytecode operations stored in the class file's definition of the method. So the synchronized method might potentially execute slightly faster and take up less space in terms of bytecode. Again, the two are, by specification, functionally identical.
Two different Threads executing a common synchronized method on the single object, since the object is same, when one thread uses it with synchronized method, it will have to verify the lock, if the lock is enabled, this thread will go to wait state, if lock is disabled then it can access the object, while it will access it will enable the lock ...
when a synchronized method exits, it automatically establishes a happens-before relationship with any subsequent invocation of a synchronized method for the same object. This guarantees that changes to the state of the object are visible to all threads
synchronized block has better performance as only the critical section is locked but synchronized method has poor performance than block. synchronized block provide granular control over lock but synchronized method lock either on current object represented by this or class level lock. synchronized block can throw NullPointerException but ...
Synchronized method is a method which can be used by only one thread at a time. Other threads will be waiting until the method will be released. You should have only valid reasons to declare method as synchronized because such method decreases the productivity and performance.