Deadlock in java is a part of multithreading. Deadlock can occur in a situation when a thread is waiting for an object lock, that is acquired by another thread and second thread is waiting for an object lock that is acquired by first thread. Since, both threads are waiting for each other to release the lock, the condition is called deadlock. One of the best ways to prevent the potential for deadlock is to avoid acquiring more than one lock at a time, which is often practical. However, if that is not possible, you need a strategy that ensures you acquire multiple locks in a consistent, defined order.