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Core Java Interview Questions
Questions Answers Views Company eMail

Difference between Applet & Application?

 6 64030

Can a lock be acquired on a class?

 3 10879

Can an abstract class be final?

 10 59876

Can an anonymous class be declared as implementing an interface and extending a class?

 2 5506

Difference between Interface & Abstract class?

 5 8543

Difference between String & StringBuffer

IBM, Infosys, Tech Mahindra, Wipro,

16 51967

Does garbage collection guarantee that a program will not run out of memory?

 1 4840

Does java support multi dimensional arrays ?

 6 12515

what are ER diagrams?

 2 5477

Explain Event handling in AWT?

Infosys, TCS,

1 6335

Explain Stream Tokenizer?

 4 9754

Explain about Superclass and Subclass?

 6 11479

What is lazy activation?

CMC,

2 6021

Howmany address lines are required to addressing 1 MB memory?

Beatroot Technologies, CSC, HCL, Hexaware, IBM,

8 27442

How the elements are organized in GridBagLayout?

 1 3274

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Un-Answered Questions { Core Java }

What is the most important feature of java? What is an interface?

508

Can we overload run() method in java?

588

How many types of threads are there in java?

497

Is singleton class thread safe?

527

What does @override mean?

528




What is wrapper class example?

529

What is runtime polymorphism or dynamic method dispatch?

514

What are different types of control structures?

484

What is the purpose of tostring() method in java?

545

What is a two-pass assembler?

600

What is singleton class in ruby?

555

How to store image in arraylist in java?

503

Can a variable be local and static at the same time?

535

What is the use of set in java?

604

Objects or references which of them gets garbage collected?

525

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