Java.lang.Void Class in Java

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.

Reference :
Java Oracle docs

This article is contributed by Mohit Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

Attention reader! Don’t stop learning now. Get hold of all the important Java and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.