13_Review Lecture

Otherwise an illegalmonitorstateexception will occur

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Unformatted text preview: st evaluate to an object reference. If the object is already locked by another thread, the thread is blocked until the lock is released. •  When a lock is obtained on the object, the statements in the synchronized block are executed, and then the lock is released. 37 Java’s Built-in Monitors A monitor is an object with mutual exclusion and synchronization capabilities. Only one thread can execute a method at a time in the monitor. A thread enters the monitor by acquiring a lock on the monitor and exits by releasing the lock. Any object can be a monitor. An object becomes a monitor once a thread locks it. Locking is implemented using the synchronized keyword on a method or a block. A thread must acquire a lock before executing a synchronized method or block. A thread can wait in a monitor if the condition is not right for it to continue executing in the monitor. 38 wait(), notify(), and notifyAll() Use the wait(), notify(), and notifyAll() methods to facilitate communication among threads. The wait(), notify...
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