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Java Interview Questions

Below we have listed all the Java Interview Questions and answers. Feel free to comment on any Java Interview Questions or answer by the comment feature available on the page.

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Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. Java is a programming language expressly designed for use in the distributed environment of the Internet. It was designed to have the "look and feel" of the C++ language, but it is simpler to use than C++ and enforces an object-oriented programming model.

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Question
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Is sizeof a keyword?
4.8 Rating
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What is static class
4.2 Rating
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What is polymorphism?
4.6 Rating
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write classes/methods to calculate the total
length of a set of lines given the start and end points taking into account overlapping.
E.g.
Line 1
start: -1.4, end: 3.2

Line 2
start: 2.9, end: 4.1
etc..

Total length would be:
line 1 length = 4.6
line 2 length =1.2,
but as line 2 overlaps line 1 by 0.3, therefore length of set is 5.5(rather than 5.8).

4.4 Rating
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What is JAR file
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What is data encapsulation? What does it buy you

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What classes of exceptions may be caught by a catch clause?
4.8 Rating
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How all can you free memory

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Which package is always imported by default?
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What is an Abstract Method?
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What is anonymous class

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What is the use of JRE and jar files. what is different between JRE and jar files.
4.5 Rating
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Why java does not support Multiple Inheritance?

3.9 Rating
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What is the ResourceBundle class?
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What is the difference between overloading and overriding?
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What is the difference between a static and a non-static inner class?
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Which containers may have a MenuBar?
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How to make application thread-safe ?


4.9 Rating
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The real time environment , when do we go for abstract class and when do we go for interfaces , can any one please revert back in this regard?

4.7 Rating
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Why do we need interface in Java. Instead of interface we can write the methods in the class itself. Why do we need seperate interface?

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India News Network
Latest 20 Questions
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
"Holiday Packages" announced as an advertisement are an example of _________: (a) Offer (b) Counter Offer (c) Invitation to Offer (d) None of the above
A match fixing contract between a player and a broker is a: (a) Valid Contract (b) Unenforceable Contract (c) Void Contract (d) Illegal Contract
When a bookseller sells a book on cash payment then it is called as ___________: (a) Unilateral Contract (b) Bilateral Contract (c) Executed Contract (d) Executory Contract
____________ agreements are created by situation: (a) Written (b) Oral (c) Void (d) Implied
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