Monday 7 March 2011

Yahoo! PHP interview questions and answers

Nick Halstead on his blog posts a list of interview questions from Yahoo! that a friend of his supplied, apparently free of NDA. Yahoo! is a strong PHP shop, with a few big names like Rasmus Lerdorf leading PHP development there.
A few questions on PHP functions, and “what does this code do?” type of questions that seem a bit off-the-mark in PHP environment, with naming consistency like array_pop and shuffle (both do operations on array), and frequent swaps in the order of parameters passed in. Some fairly good questions, though:
How do you debug a PHP application? - Interesting to see what the interviewee used outside of echo’s and error_log’s.
Is PHP better than Perl? Discuss. and before that What’s the difference between the way PHP and Perl distinguish between arrays and hashes? - not sure how that relates to someone who’ve been using PHP all around, but occasionally played around with Perl, or vice versa, but nevertheless some good starting points for discussion.

Newbie Java questions

  1. If Runnable interface is better than Thread class, than why we are using Thread class? What is the need for Thread class?
  2. Why we are calling System.gc() method to garbage collection of unused object, if garbage collection is automatically done in Java by daemon thread in background process with regular interval?
  3. What is the significance of Marker interface? Why are we using, even though it has no method?
  4. Why we are always doing rs.next() in first line of while loop in retrieving data from database through result set?
  5. Please give me the details of synchronization? And which are the methods and elements used in it and why only that methods and variables?
  6. Why we are not using Java in real time based application, but instead we are using C or C++?
  7. Detail difference between 4 types of driver and their use in different different applications?
  8. Is Java code with native methods platform-independent?
  9. Why is the compiler platform-independent, while JVM is platform-dependent?\
  10. Mention different type of compilers and interpreters in Java?

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