Question 56 :
What interface must an object implement before it can be written to a stream as an object?
An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object.
Question 57 :
How are this and super used?
this is used to refer to the current object instance. super is used to refer to the variables and methods of the superclass of the current object instance.
Question 58 :
What is the purpose of garbage collection?
The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources may be reclaimed and reused.
Question 59 :
What is a compilation unit?
A compilation unit is a Java source code file.
Question 60 :
What interface is extended by AWT event listeners?
All AWT event listeners extend the java.util.EventListener interface.