By Arulkumaran Kumaraswamipillai
Four hundred+ Java/J2EE Interview questions with transparent and concise solutions for: task seekers (junior/senior builders, architects, team/technical leads), promoting seekers, pro-active novices and interviewers. unfastened obtain Lulu most sensible a hundred top vendor. raise your incomes strength by means of studying, utilising and succeeding. examine the basics when it comes to Java/J2EE in a simple to appreciate questions and solutions method. Covers four hundred+ renowned interview Q&A with plenty of diagrams, examples, code snippets, go referencing and comparisons. this isn't basically an interview consultant but additionally a short reference consultant, a refresher fabric and a roadmap masking quite a lot of Java/J2EE similar issues.
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Extra resources for Java J2EE Job Interview Companion
Q 19: What are the non-final methods in Java Object class, which are meant primarily for extension? LF CO A 19: The non-final methods are equals(), hashCode(), toString(), clone(), and finalize(). The other methods like wait(), notify(), notifyAll(), getClass() etc are final methods and therefore cannot be overridden. e. inheritance). Important: The equals() and hashCode() methods prove to be very important, when objects implementing these two methods are added to collections. If implemented incorrectly or not implemented at all then your objects stored in a collection like a Set, List or Map may behave strangely and also is hard to debug.
If a field is not used in equals(), then it must not be used in hashCode(). If it is accessed often, hashCode() is a candidate for caching to enhance performance. It is a best practice to implement the user defined key class as an immutable (refer Q21) object. Q. Why it is a best practice to implement the user defined key class as an immutable object? e. g. setName(“Sam”)) the key after the object has been added to the HashMap then you will not be able to access the object later on. e. containsKey(key) will return false because the key “John” becomes “Sam” in the “List of keys” at the key index “345678965” if you mutate the key after adding.
This is a “shallow comparison”. The equals() - returns the results of running the equals() method of a user supplied class, which compares the attribute values. The equals() method provides “deep comparison” by checking if two objects are logically equal as opposed to the shallow comparison provided by the operator ==. If equals() method does not exist in a user supplied class then the inherited Object class's equals() method is run which evaluates if the references point to the same object in memory.