Difference between yield method and sleep in java?

Answer 1

Thread.sleep(long milliseconds): The thread's sleep method sends the current thread into Non-Runnable state for the specified amount of time. But, this doesn't cause the thread to loose ownership of the acquired monitors. So, if the current thread is into a synchronized block/method, then no other thread will be able to enter that block/method.

The Sleep method throws 'InterruptedException' if another thread interrupts it.

There is another variant of the 'sleep()' method where it accepts two arguments - one, long milliseconds, and second, int nanoseconds. Simply put, this method causes the current thread to sleep for the specified number of milliseconds plus the specified number of nanoseconds. The second argument 'int nanoseconds' can acquire a value of the range 0-999999.

wait() method: The wait() method also sends the current thread into Non-Runnable state like the sleep() method. But, the difference between the two is that in case of 'wait()' the locks are released before going into Non-Runnable state, so that any other thread that is waiting on the object can use it (Unlike the Sleep method - This is the big difference) Another apparent difference is that 'wait()' is an instance method, while sleep() is a static method. The method 'wait()' should be called for an object only when the current thread has already acquired lock for that object. This causes the current thread to wait either another thread invokes the 'notify()' method or the 'notifyAll()' method for this object, or a specified amount of time has elapsed and after that the thread starts participating in thread scheduling process to acquire the monitor of the object to proceed further.

There are three variants of this method in the 'Object' class:-

public final void wait(long timeout)

public final void wait(long timeout, int nanoseconds)

public final void wait()

All the three methods throw InterruptedException & IllegalMonitorStateException. The first two may also throw IllegalArgumentException.

The wait() method causes the current thread to place itself in the wait set for this object and then to relinquish any and all synchronization claims on this object. After the execution of this method invocation, the thread becomes disabled for any scheduling purposes and lies dormant until one of the following things happen:-

* Any other thread invokes 'notify()' method this object and the thread under consideration is arbitrarily chosen as the thread to be awakened. * Any other thread invokes 'notifyAll()' for this object. * Any other thread interrupts the thread under consideration. * The specified amount of time has elapsed (in case first two variants of wait() are used) After any of the four above mentioned events happens, the thread is removed from the wait set for this object and re-enabled for thread scheduling. It'll compete for the rights to synchronize on the object in an usual manner and it'll keep doing this until it acquires control on the object and gains all the synchronization claims on the object, which it had acquired at the time of 'wait()' invocation. This means that after the return from wait() method, the synchronization state of object and of the thread will be exactly the same as it was before the wait() invocation.

Answer 2

sleep will pause the current thread for the specified number of milliseconds.

yield will give an opportunity for other threads to execute, if you use multiple threads. If there are no other threads, or the other threads have nothing to do, after a yield the current thread will continue executing almost immediately.

sleep will pause the current thread for the specified number of milliseconds.

yield will give an opportunity for other threads to execute, if you use multiple threads. If there are no other threads, or the other threads have nothing to do, after a yield the current thread will continue executing almost immediately.

sleep will pause the current thread for the specified number of milliseconds.

yield will give an opportunity for other threads to execute, if you use multiple threads. If there are no other threads, or the other threads have nothing to do, after a yield the current thread will continue executing almost immediately.

sleep will pause the current thread for the specified number of milliseconds.

yield will give an opportunity for other threads to execute, if you use multiple threads. If there are no other threads, or the other threads have nothing to do, after a yield the current thread will continue executing almost immediately.

Answer 3

sleep will pause the current thread for the specified number of milliseconds.

yield will give an opportunity for other threads to execute, if you use multiple threads. If there are no other threads, or the other threads have nothing to do, after a yield the current thread will continue executing almost immediately.