Why are wait, notify and notifyAll methods of the class Object?

Why are wait, notify and notifyAll methods of the class Object?

By : user2953679
Date : November 21 2020, 01:01 AM
wish helps you The fact that methods are inherited does not violate the Single Responsibility Principle. It could potentially violate the SRP if those methods could be overridden. But they cannot, they are declared final.
The SRP defines reponsibility
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Java notify(), notifyAll() and wait() methods

Java notify(), notifyAll() and wait() methods

By : ajeshh
Date : March 29 2020, 07:55 AM
I wish this help you
Threads can use Objects to transmit messages from one thread to another, and these methods allow that to happen. A Thread calls wait() to say "I am waiting for a message to be sent to this object." Another thread can call notify() to say "I am sending a message to that object." The Object is therefore a conduit through which threads communicate without explicitly referencing each other. If the methods were in the Thread class, then two threads would need to have references to one another to communicate. Instead, all communicating threads just need to agree to use some specific shared resource.
synchronized block/method without wait() and notify() notifyAll() methods

synchronized block/method without wait() and notify() notifyAll() methods

By : Yurgen
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , It is mandatory that wait(), notify() and notifyAll() should always be called from within a synchronized block. But it does not mean that synchronized blocks should always have one of these methods.
why wait/notify/notifyAll methods are not synchronized in java ?

why wait/notify/notifyAll methods are not synchronized in java ?

By : zbgn
Date : March 29 2020, 07:55 AM
Hope this helps For notify and notifyAll, the problem with your idea is that when you notify you also have other stuff you're typically doing in the same synchronized block. So making the notify method synchronized wouldn't buy you anything, you'd still need the block. Likewise wait has to be in a synchronized block or method in order to be useful, such as being inside a spinlock where the test has to be synchronized anyway. So the granularity of locking is all wrong for what you suggest.
Here's an example, this is about the simplest queue implementation you can have in Java:
Why wait ,notify and notifyAll Methods are in Object Class?

Why wait ,notify and notifyAll Methods are in Object Class?

By : Harmen Kraaijeveld
Date : March 29 2020, 07:55 AM
hop of those help? They are also in the Thread class. But a thread instance here is equally well suited as a synchronization object as any other object.
In addition, there have already been voices that question this decision of sun, since now every object carries the burden to be able to be synchronized on, and IMHO they should have refactored this out to separate objects long ago.
Why wait, notify and notifyAll are methods in Object class not like Cloneable

Why wait, notify and notifyAll are methods in Object class not like Cloneable

By : Scoot
Date : March 29 2020, 07:55 AM
To fix the issue you can do JVM uses OS-level threads. That means that each concrete JVM for each concrete OS handles threads differently. And these methods are not only implemented in Object class, they are marked as native, which kind of means that the are implemented in system layer of JVM.
And if those methods were in some interface, that would mean that anybody can redefine them.
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