Java.lang.Void class is a placeholder which holds a reference to a class object if it represents void keyword. It is a uninstantiable placeholder. Well, uninstantiable means that this class have a private constructor and no other constructor that we can access from outside.
Methods of lang.void class are all inherited from Object class in Java:
- getClass() : Returns the runtime class of the argumented Object.
- hashCode() : Returns a hash code value for the object.
- equals() : Checks whether the two objects are equal or nor.
- clone() : Returns a copy of the object.
- toString() : Returns string representation of the object.
- notify() : Wakes up a single thread that is waiting on this object’s monitor.
- notifyAll() : Wakes up all threads that is waiting on this object’s monitor.
- wait() : Makes current thread to wait until previous thread invokes either notify() or notifyAll() methods.
- finalize() : Called By the garbage collector on an object when garbage collection determines that there are no more references to the object.
Java Oracle docs
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