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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 null a keyword
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what is method declaration,method attributes,method modifiers and parameters
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What?s the difference between an Abstract Class and Interface in Java?
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The following code is executed by a multi-threaded environment:

public void functionOne() {
System.out.println("Staring itrs= " + this.cntr);
for( int i=0; i<this.cntr; i++ ) {
System.out.println("iteration: " + i);
}
System.out.println("completed");
}
and when run produces:
Starting itrs= 100
iteration: 1
iteration: 2
iteration: 3
iteration: 4
iteration: 5
Give at least one reason why this is happening
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What is numeric promotion?
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How have you done validation of the fileds in your project?
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Can an unreachable object become reachable again?
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What is the difference between Iterator and Enumeration?
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What is upward and downward casting in Java?

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How are this() and super() used with constructors?
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Which class should you use to obtain design information about an object?
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Explain Servlet and JSP life cycle

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can we declare multiple main() methods in multiple classes.ie can we have each main method in its class in our program?

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1-explain singleton pattern in java
2-explain up casting and down casting
3-how do u code a singleton in java
4-How do u read XML file in java
5-gine an example of the Decorator pattern in the java API.
6-What r the services provided by the container?
7-what r bean managed transaction?
8-what r transaction attributes?
9-what is JTS?


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How to use printer option in java or is there any method to use print command?

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In Java, You can create a String object as:
String str = "abc"; &
String str = new String("abc");
Why cant a button object be created as : Button bt = "abc"
Why is it compulsory to create a button object as: Button bt = new Button("abc");
Why is this not compulsory in String's case?
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How will you perform transaction using JDBC?
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Which arithmetic operations can result in the throwing of anArithmeticException?
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What are the files generated after using IDL to Java Compilet

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What is the difference between exception and error?
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India News Network
Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
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
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