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Core Java Interview Questions
Questions Answers Views Company eMail

explain the life cycle of thread?

CTS, NIIT, TCS,

10 30783

what is polymorphism?

Zensar,

5 8923

what is mean by overriding in which situation we wil use?

Atlas Systems, CSC, DCPL,

5 9104

what ide u r using and wat version, how wil u build the project etc ?

2 2792

what is difference between throw and throws in exception?

Spenco,

48 71823

What is difference between Iterator and for loop

HP,

9 46306

what is polymorhism what is inheritance? what is Abstract n Interface? what if two interfaces have same method and a concrete class is implementing both the interfaces. Will there be a compilation error? What are mutable and immutable classes? How can u make a class mutable? when will u use dem ...explain with example? what is overriding and overloading? what is garbage collection? what is Thread? how do dey communicate? what are the different ways of implementing ? have u used any messaging technologies? what is synchronization? what are some additions in java 1.5? what are generics? whst is advanced for loop? what is finally block? can u have a try in finally? yes!! can u have a finally in finally? how do you write junits? when is a object eligible for garbage collection?explain? a = null and b has ref to a will b be eligible to be garbage collected? sql questions like diff joins? how do dey work? exception handling? what is marker interface? what is the need??

JPMorgan Chase,

1328

Thanks A.jyotsna, Can u tell me differnce between abstract class and interface vikash

4 4340

how can you retrive information from database by using hashmap/arraylist ,plz explain with example briefly?

Satyam,

1 5792

how can u handle run time exception in java? explain with brief explanation with examples?

CTS,

2 8808

23. Storage space in java is of the form Stack Queue Heap List 24. What is java code embedded in a web page known as Applets Servlets scriptlets snippets 25. Which of the following attributes are compulsory with an tag?. code,height & width. 26. What does 'CODEBASE' in an applet tag specify?. Files absolute path.

TCS,

1716

What is Ideal Design of Class?

2 3368

Need 2+ yrs experienced java techinical question papaer for company Iflex

TCS,

1 9056

class A{ some variables; public void a()throws Excepion1,Exception2{....} } class B extends A{ variables... public void a()throws E2,E3{.....} } Qns: here override of methods occurs or not,ore else wil give any compilation error or run properly..plz tell me briefly whts happening with the above codes....

Quinnox,

4 5974

what is difference between business delegate and data access object(dao)? in java?

1 6645


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Un-Answered Questions { Core Java }

What is the lifetime and scope of a variable?

166


What are abstract classes and anonymous classes?

256


What is oop in java?

184


Can you inherit from an abstract class java?

182


What is bufferedwriter?

178






Where is singleton pattern used?

171


Is it possible to use string in the switch case?

196


Why java is made?

188


java program with complete 4 oops concepts implemented example

2396


From the two, which would be easier to write: synchronization code for ten threads or two threads?

202


Can a source file contain more than one class declaration?

190


Can we clone singleton object in java?

194


Is an array a vector?

184


What is method overloading and method overriding?

200


What are latest features introduced with java 8?

195