Object in Java

In Java, it's the root class. All objects implement the methods of this class.

clone(), creates and returns a copy of the object

equals(Object), tests whether the two objects are equal to each other.

finalize(), garbage collector calls this method when there are no more references to this object

getClass(), returns the runtime class of the Object

hashCode(), hash code value of the Object

toString(), string representation of the Object

Thread related functions:

notify(), notify/awaken a single thread waiting on this object

notifyAll(), notify/awaken all threads waiting on this object

wait(), causes the current thread to wait until another thread invokes notify

wait(timeout), causes the current thread to wait until another thread invokes notify or the timeout is up