http://www.java2novice.com/java-interview-programs/
http://javarevisited.blogspot.in/2011/06/top-programming-interview-questions.html
https://www.javacodegeeks.com/2014/04/java-interview-questions-and-answers.html
http://www.gcreddy.com/2013/01/core-java-interview-questions.html
http://www.thecrazyprogrammer.com/2015/10/core-java-interview-questions-and-answers.html
http://javarevisited.blogspot.in/2011/06/top-programming-interview-questions.html
https://www.javacodegeeks.com/2014/04/java-interview-questions-and-answers.html
http://www.gcreddy.com/2013/01/core-java-interview-questions.html
http://www.thecrazyprogrammer.com/2015/10/core-java-interview-questions-and-answers.html