What is the difference between synchronized and locks in Java?

What is the difference between synchronized and locks in Java?

In Java, 'synchronized' is a keyword that allows only one thread to access a block of code or method at a time, ensuring thread safety. Locks, on the other hand, are objects that provide more flexible thread synchronization mechanisms.

Can you explain how synchronized works with methods?

Sure! When a method is declared as synchronized, the thread holds the monitor for that method's object. If another thread tries to access the same method, it will be blocked until the first thread releases the monitor.

What are the advantages of using locks over synchronized?

Locks offer more advanced features like tryLock, which allows a thread to attempt to acquire a lock without blocking. They also support fairness policies and can be used for multiple conditions.

Are there any downsides to using synchronized?

Yes, synchronized can lead to thread contention and can be less flexible than locks. It also doesn't allow for interruptible lock acquisition.