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Search Interview Questions |  3273 questions in repository. There are more than 200 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know. |
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| Interview Questions and Answers for 'TD' - 20 question(s) found - Order By Newest | |||||
 Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) | |||||
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| Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory. x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object. Sample code: String x = new String("str"); String y = new String("str"); System.out.println(x == y); // prints false System.out.println(x.equals(y)); // prints true | |||||
 Sample Code for equals | |||||
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 Discuss Correct / Improve  java string comparison string object class == equals object equality operator  Asked in 289 Companies  basic  frequent | |||||
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| Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies. | |||||
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| Ans. Overloading - Similar Signature but different definition , like function overloading. Overriding - Overriding the Definition of base class in the derived class. | |||||
| Sample Code for overloading Sample Code for overriding | |||||
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| Discuss Correct / Improve java oops overloading overriding oops concepts basic interview question Asked in 82 Companies basic frequent | |||||
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| Ans. A DOM (Document Object Model) parser creates a tree structure in memory from an input document whereas A SAX (Simple API for XML) parser does not create any internal structure. A SAX parser serves the client application always only with pieces of the document at any given time whereas A DOM parser always serves the client application with the entire document no matter how much is actually needed by the client. A SAX parser, however, is much more space efficient in case of a big input document whereas DOM parser is rich in functionality. Use a DOM Parser if you need to refer to different document areas before giving back the information. Use SAX is you just need unrelated nuclear information from different areas. Xerces, Crimson are SAX Parsers whereas XercesDOM, SunDOM, OracleDOM are DOM parsers. | |||||
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| Discuss Correct / Improve java xml parsers sax dom parser difference architecture technical lead technical architect markup language Asked in 14 Companies frequent | |||||
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| Ans. Yes, That is possible class A { public static void main(String args[]){ if(System.out.printf("Hello World")==null){} } } | |||||
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| Discuss Correct / Improve Hello World Hello world without ; Asked in 2 Companies rare | |||||
| Frequently asked question for intermediate developers. | |||||
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| Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached. | |||||
| Sample Code for volatile | |||||
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| Discuss Correct / Improve java oops synchronization volatile java keywords Asked in 42 Companies intermediate frequent | |||||
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| Ans. It is the process of examining / modifying the behaviour of an object at runtime. | |||||
| Sample Code for reflection | |||||
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| Discuss Correct / Improve java reflection reflection api ebay mindtree Asked in 27 Companies basic frequent | |||||
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| Ans. DTD or Document Type Definition is a standard agreed upon way of communication between two parties. Your application can use a standard DTD to verify that data that you receive from the outside world is valid and can be parsed by your parser. | |||||
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| Discuss Correct / Improve xml markup language dtd document type definition architecture | |||||
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| Ans. XSD or Xml Schema Definition is an extension of DTD. XSD is more powerful and extensible than DTD | |||||
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| Discuss Correct / Improve java xml markup language xsd dtd architecture | |||||
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| Ans. Since String is immutable, its hashcode is cached at the time of creation and it doesnt need to be calculated again. This makes it a great candidate for key in a Map and its processing is fast than other HashMap key objects. This is why String is mostly used Object as HashMap keys. | |||||
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| Discuss Correct / Improve java string class string immutable immutability hashmap immutable immutability hashcode hash code advanced Asked in 2 Companies expert frequent | |||||
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| Ans. It's a facility that allows traversal over the records pulled from a table or combination of tables. Its like iterator in Java. | |||||
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| Discuss Correct / Improve databases sql cursors packages Asked in 5 Companies basic frequent | |||||
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| Ans. No Difference. Both are the acceptable ways to declare an array. | |||||
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| Discuss Correct / Improve java array arrays array declaration difference between Asked in 3 Companies basic | |||||
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| Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc. | |||||
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| Discuss Correct / Improve elsevier frameworks java frameworks general question Asked in 3 Companies basic frequent | |||||
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| Ans. [Open Ended Answer] This is a very sensitive question and should be dealt with caution. Just simply saying that you never had any disagreement will present you as dumb team member. Showing your self as too aggressive in such decisions will present you as a trouble maker. You should present a situation where you had an argument / disagreement but eventually you and your team mates mutually found a way out of it. | |||||
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| Discuss Correct / Improve Asked in 20 Companies basic | |||||
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| Ans. TDD is a development process that involves short iterations: first an automated test case is written. Then, the code is written to pass that test, and finally one refactors the new code to acceptable standards. | |||||
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| Discuss Correct / Improve elsevier test driven design ( TDD ) software development methodologies Asked in 3 Companies frequent | |||||
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| Ans. Shutdown hook is a thread that is invoked before the JVM is shut down. we can use it perform resource cleaning task. | |||||
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| Discuss Correct / Improve shutdown hook jvm | |||||
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| Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web. | |||||
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| Discuss Correct / Improve aws amazon s3 aws s3 aws storage amazon cloud storage amazon s3 Asked in 12 Companies | |||||
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| This question was recently asked at 'TD Ameritrade'.This question is still unanswered. Can you please provide an answer. | |||||
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| Discuss Correct / Improve Asked in 1 Companies | |||||
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| Ans. Yes. Both concepts are independent of each other. Overriding depends on the methods with same name and signature whereas Overloading on same name but with different signatures. All definitions of an overloaded method can be individually overridden in the derived class. For example - Class A has overloaded methods "public void myMethod(String str)" and "public void myMethod(int x)" We can have derived class ClassB extends ClassA and hence can override both methods myMethod(String str) and myMethod(int x) in ClassB | |||||
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| Discuss Correct / Improve overloading overriding Asked in 1 Companies | |||||
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| Discuss Correct / Improve CountingSemaphore CountDownLatch | |||||
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| Ans. Layer 7 - Application Layer 6 - Presentation Layer 5 - Session Layer 4 - Transport Layer 3 - Network Layer 2 - Data Link Layer 1 - Physical | |||||
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| Discuss Correct / Improve Asked in 7 Companies | |||||
Which of the following statement is not true ?
