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What are the criteria for keyword synchronized in Java to work?

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Synchronized keyword allows only one thread to pass through it. It is used in multithreaded environment to maintain ACID(Atomicity, Consistency, Isolation, Durability) property. We can use synchronized keyword in 2 ways. class level and object level. It is implemented in the method or synchronized block....
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Synchronized keyword allows only one thread to pass through it. It is used in multithreaded environment to maintain ACID(Atomicity, Consistency, Isolation, Durability) property. We can use synchronized keyword in 2 ways. class level and object level. It is implemented in the method or synchronized block. What it does is t that when a thread comes to a synchronized block or method the thread acquires the lock of the object. This does not allow the other thread to execute which is not having lock. E.g of implementation read less
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For threads mutual exclusion, we need to achieve synchronization between threads. Till one thread will not complete its execution ,no any other thread can enter into the process. you can achieve synchronization by defining method as synchronized or object defined as synchronized.
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