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Want to join us? Please take a short quiz and submit your resume. You may have to look up some of the answers for question 3.

Quiz

1. Suppose there are two empty 747s in NYC and LA, each about to head straight towards the other city at full speed, and there's no wind. If they both took off at the same time, over what state would they meet and approximately how many hours would it take them to meet? (This is not a trick question)

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2. Assuming multiple threads will be accessing the 'Widget' class frequently, what is wrong with this scenario? Provide a revised implementation.

class Widget {
	  private int counter = 0;

	  public int getValue() {return counter;}
	  public void setValue(int x) {counter = x;}

	  ...
}

public static void main(String[] args) {
	  Widget someWidget = new Widget();
	  ...
	  while(someBoolean) {
			int var = someWidget.getValue();
			//Do something here that takes a little time
			...
			//Increment Widget counter
			someObject.setValue( var + 1 );
	  }
}

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3. A few questions on garbage collection:

a. How do you enable the concurrent garbage collector on Suns' JVM?
b. Why would you want to enable a concurrent garbage collector?
c. Why wouldn't you?
d. Describe a circumstance that would be faster under a garbage collected system than under a malloc/free/new/delete system.
e. Describe a circumstance that would be faster under a malloc/free/new/delete system than under a garbage collected system.

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4. Write a program that finds the number that doesn't fit. You have the following data stored in a two dimensional array "xArray[][]"

1	1	1	1	1	1
2	4	8	16	32	64
3	9	27	81	243	729
4	16	64	256	1024	4096
5	25	125	625	3125	15625
6	36	216	1296	7776	46656
7	49	343	2401	16806	117649
8	64	512	4096	32768	262144
9	81	729	6561	59049	531441

What is the number that doesn't fit?

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