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Well, tricky Java interview questions are those questions which have some surprise element on it. If you try to answer a tricky question with common sense, you will most likely fail because they require some specific knowledge. If I take an interview, I purposefully put this kind of question to gauge the depth of candidate’s understanding in Java. Another advantage of asking such question is the surprising element, which is a key factor to put the candidate on some pressure during interviews. Since these questions are less common, there is good chance that many Java developer doesn’t know about it. You won’t find these questions even on popular Java interview books like Java Programming Interview exposed, which is nevertheless an excellent guide for Java interviews. Btw, if you don’t find these question tricky enough, then you should check Joshua Bloch’s another classic book, Java Puzzlers for super tricky questions.
I am sure you will find them challenging enough. 10 Tricky Java interview question – Answered Here is my list of 10 tricky Java interview questions, Though I have prepared and shared lot of difficult core Java interview question and answers, But I have chosen them as Top 10 tricky questions because you can not guess answers of this tricky Java questions easily, you need some subtle details of Java programming language to answer these questions. Question: What does the following Java program print? So unlike the obvious answer, this program will print 0. What will happen if you put return statement or System.
This is a very popular tricky Java question and it’s tricky because many programmers think that no matter what, but the finally block will always execute. This question challenge that concept by putting a return statement in the try or catch block or calling System. Answer of this tricky question in Java is that finally block will execute even if you put a return statement in the try block or catch block but finally block won’t run if you call System. Question: Can you override a private or static method in Java? Another popular Java tricky question, As I said method overriding is a good topic to ask trick questions in Java. Anyway, you can not override a private or static method in Java, if you create a similar method with same return type and same method arguments in child class then it will hide the superclass method, this is known as method hiding.
Similarly, you cannot override a private method in sub class because it’s not accessible there, what you do is create another private method with the same name in the child class. See Can you override a private method in Java or more details. Question: What do the expression 1. Answer: This is another tricky question from Double class. Though Java developer knows about the double primitive type and Double class, while doing floating point arithmetic they don’t pay enough attention to Double.
To test if x is a NaN, one should use the method call Double. If you know SQL, this is very close to NULL there. Java is the argument Interviewer often give. Answer of this question is much more subtle then it looks like, because Java does support multiple inheritances of Type by allowing an interface to extend other interfaces, what Java doesn’t support is multiple inheritances of implementation. The Same key will result in the same hashcode and will end up at the same position in the bucket. Each bucket contains a linked list of Map. Entry object, which contains both Key and Value.
Answer: The trickiness of this question lies on character encoding and how String to byte array conversion works. 8-bit range of byte primitive type, it is reasonable to guess that the str. However, that’s not what the program prints and that’s why this question is tricky. As a matter of fact, the output of the program is operating system and locale dependent. On a Windows XP with the US locale, the above program prints , if you run this program on Linux or Solaris, you will get different values. To answer this question correctly, you need to know about how Unicode characters are represented in Java char values and in Java strings, and what role character encoding plays in String.
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