Cracking the Java Coding Interview pdfdrive com

Question If an object is garbage collected, can it become reachable again?
(Core Java)
Answer Once an object is garbage collected, it ceases to exist. It
can no longer become reachable again.
Question What are E and PI? (Core Java)
Answer E is the base of the natural
logarithm and PI is mathematical value pi.
Question Are true and false keywords? (Core Java)
Answer The values true
and false are not keywords.
Question What is the difference between the File and RandomAccessFile
classes? (Core Java)
Answer The File class encapsulates the files and directories of the local file
system. The RandomAccessFile class provides the methods needed to directly
access data contained in any part of a file.

---

Question What happens when you add a double value to a String? (Core
Java)
Answer The result is a String object.
Question What is your platform's default character encoding? (Core Java)
Answer If you are running Java on English Windows platforms, it is probably
Cp1252. If you are running Java on English Solaris platforms, it is most likely
8859_1.
Question Which package is always imported by default? (Core Java)
Answer The java.lang package is always imported by default.
Question What interface must an object implement before it can be written
to a stream as an object? (Core Java)
Answer An object must implement the Serializable or Externalizable interface
before it can be written to a stream as an object.
Question How can my application get to know when a HttpSession is
removed? (JSP)
Answer Define a Class HttpSessionNotifier which implements
HttpSessionBindingListener and implement the functionality what you need in
valueUnbound() method. Create an instance of that class and put that instance in
HttpSession.