Cracking the Coding Interview - Fooo

Chapter 14 | Java
How to Approach:
While Java related questions are found throughout this book, this chapter deals with questions
about the language and syntax You generally will not find too many questions like this
at the larger software companies (though they are sometimes asked), but these questions
are very common at other companies
What do you do when you don’t know the answer?
If you don’t know the answer to a question about the Java language, try to figure it out by
doing the following: (1) Think about what other languages do (2) Create an example of the
scenario (3) Ask yourself how you would handle the scenario if you were designing the
language
Your interviewer may be equally—or more—impressed if you can derive the answer than if
you automatically knew it Don’t try to bluff though Tell the interviewer, “I’m not sure I can
recall the answer, but let me see if I can figure it out Suppose we have this code…”
Classes & Interfaces (Example)
1 public static void main(String args[]) { … }
2 interface Foo {
3 void abc();
4 }
5 class Foo extends Bar implements Foo { … }
final:
» Class: Can not be sub-classed
» Method: Can not be overridden
» Variable: Can not be changed
static:
» Method: Class method Called with Foo DoIt() instead of f DoIt()
» Variable: Class variable Has only one copy and is accessed through the class name
abstract:
» Class: Contains abstract methods Can not be instantiated
» Interface: All interfaces are implicitly abstract This modifier is optional
» Method: Method without a body Class must also be abstract
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Cracking the Coding Interview | Knowledge Based