What is the difference between the wait () and sleep () methods?

What is the difference between the wait () and sleep () methods?

Wait() method releases lock during Synchronization. Sleep() method does not release the lock on object during Synchronization. Wait() should be called only from Synchronized context. There is no need to call sleep() from Synchronized context.

What’s the difference between the methods sleep () and wait () Mcq?

Whenever a thread calls wait() method, it releases the lock or monitor it holds and when it calls sleep() method, it doesn’t release the lock or monitor it holds. This is the main difference between wait() and sleep() methods.

What happens when thread’s sleep () method is called?

Thread. sleep causes the current thread to suspend execution for a specified period. This is an efficient means of making processor time available to the other threads of an application or other applications that might be running on a computer system.

What is the difference between notify () and notifyAll ()?

In case of multiThreading notify() method sends the notification to only one thread among the multiple waiting threads which are waiting for lock. While notifyAll() methods in the same context sends the notification to all waiting threads instead of single one thread.

What is the difference between wait () notify () and notifyAll ()?

The wait() method causes the current thread to wait until another thread invokes the notify() or notifyAll() methods for that object. The notify() method wakes up a single thread that is waiting on that object’s monitor. The notifyAll() method wakes up all threads that are waiting on that object’s monitor.

What is difference between hibernate and hybrid sleep?

Sleep is a power-saving state that allows a computer to quickly resume full-power operation. Hibernation is a power-saving state designed primarily for laptops. Hybrid sleep is designed primarily for desktop computers and is a combination of sleep and hibernate.

What is the difference between sleep hibernate and shutdown?

Hibernate mode is almost the same thing as fully shutting down your PC, except it saves your place in Windows to resume the next time you turn it on. Instead of saving to your RAM like sleep mode, it saves straight to your hard drive so that there’s no chance of losing anything if power is abruptly cut.

Why wait is called from synchronized block?

Calling notify() or notifyAll() methods issues a notification to a single or multiple threads that a condition has changed and once the notification thread leaves the synchronized block, all the threads which are waiting for fight for object lock on which they are waiting and lucky thread returns from wait() method …

What is difference between sleep and restart?

Restart: Reboots the computer. (This option is often required as part of installing new software programs or Windows updates.) Sleep: Puts the computer into a low-power mode that retains all running programs and open windows in computer memory for a super-quick restart.

Why wait notify and notifyAll is?

If wait() and notify() were on the Thread instead then each thread would have to know the status of every other thread and there is no way to know thread1 that thread2 was waiting for any resource to access. Hence, notify, wait, notifyAll methods are defined in object class in Java.

Which is better hibernate or sleep or shutdown?

In situations where you just need to quickly take a break, sleep (or hybrid sleep) is your way to go. If you don’t feel like saving all your work but you need to go away for a while, hibernation is your best option. Every once in a while it’s wise to completely shutdown your computer to keep it fresh.

Which is better hibernate or sleep mode?

When you boot up your computer, your computer’s state will be saved, including all opened programs and data, so you can quickly access any work you’ve stepped away from. It takes longer to resume from hibernate than sleep, but hibernate uses much less power than sleep.

What is a disadvantage of hibernating?

Hibernate does not allow some queries which are supported by JDBC. For example, It does not allow to insert multiple objects (persistent data) to same table using single query. Developer has to write separate query to insert each object.

Is it OK to leave PC in sleep mode?

According to the U.S. Department of Energy, it’s recommended that you put your computer into sleep mode if you’re not going to be using it for more than 20 minutes. It’s also recommended that you shut down your computer if you’re not going to use it for more than two hours.