Interview questions - Level 1

I would appreciate correct answers attached here to check ourselves :D

7- final is a class access modifier. finally is the code to be executed after a try and catch statement in either scenario. finalize is deprecated method that supposedly releases resource bu deleting them once they are no longer referenced by any other code or objects 8- it a good replacement for finalize where you can open resources and close them as soon as they are done. 9- read number 4 10- i++ will get the latest i number then increment i by 1, while ++i will increment last known i by one.

1- Object class's Methods are : clone(), equal(), hashcode(), finalize(), getClass(), toString(), notify(), notifyAll(), wait() 2- To be able to compare objects on what matter to us for an object to be equal , equal(). Hashcode method is a mechanism used in many java methods and objects. When we @Override equal() we must override hashcode() on the fields that makes the equal() works 3- causes major issues when running your code especially when using collections or hascode based objects. which is called violation of general contract of Object.hashcode() 4- inside a synchronized block, where you can use wait() or notify(), if an object is locked for synchronization but that object is dependent on another object's existent then instead of locking your resources until that dependent object exist, you can release the synchronization to other object and suspend the one that is waiting. the notify will simply tell the waiting object to get the synchronization going because the dependent object exists now. wait(), notify() can only be used inside the synchronized() block 5- for primitive fields type objects , a simple clone method will do. for everything else we must do deep cloning which is basically creating a new instance of the object being cloned and pass the fields we intend to clone. Deep cloning creates a new reference to the fields which will help us avoid changes to the cloned object if the original object changed. 6- Supposedly finalize closes resources by telling the garbage collector that we are done with them. the garbage collector check is there is any more references to the object, and if there are none, then the garbage collector deletes the object and free resources. In reality that doesn't happen as we wish and we should avoid using finalize() guys feel free to correct me and i will edit

I wish we'd been given these kinds of questions to check our understand throughout the whole course...

I might be wrong, but wait(1000) and sleep(1000) does the exact same thing ? (Except that you can probably only use wait() in a synchronized block ?

Cool!

I like this! Would love for this to be included in all topics.