Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

String is an immutable object. Then how can the following code be justified. String s1 = ?ABC?; String s1 = s1+?XYZ?; s.o.p(s1); The output is ABCXYZ, which is the value of s1 ?

Flextronics, Keane India Ltd,

6 18209

Instead of writing Home, Remote Interfaces if i directly extends EJBObject to bean class what happens?

Flextronics,

1 5343

when we write class.forName("any one class"); what happens actually?what it will return?explain stepwise?

6 9373

explain System.out.println

Calpine Technologies, Care, Cognizant, CTS, IBM, IBS, LibSys, Oracle, Spiro Solutions, TCS,

107 202051

What is the use of Getters and Setters method ?

4 16990

What is hard code & soft code?

Cognizant, Wipro,

7 61416

jdbc drivers?

Wipro,

8 15750

Can we declare an anonymous class as both extending a class and implementing an interface?

College School Exams Tests, JVA, TCS, Wipro,

8 18332

what is difference Between Core Java and advance java

HCL, HP, Sambalpur University, TCS, Vensai Technologies, Wipro,

60 176456

how cani read a command line argument?(usingfile object).

3 6634

what is the use/perpose of having a method antive?

2 5782

when asub class inherits a super class and overrides a public method of super class in sub class(public method in super class). why these methods needs to be public in sub class. (otherwise compile time error).

3 6569

what is the difference between statis block and static variable

7 11431

Can we call the Thread.sleep in Synchyronozed block?

Logica CMG,

5 19215

how can we use the servlet as standalone apllication?should we need to extend any class?

Logica CMG,

2 7368

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Un-Answered Questions { Core Java }

Is it necessary for the port addresses to be unique? Explain with reason.

1018

what is the difference between the methods sleep() and wait()? : Java thread

976

Can you pass functions in java?

1032

Define class?

1058

What is flush () in java?

1013

Can a final variable be manipulated in java?

984

What is variable in java?

990

What does 0 mean in boolean?

977

What are daemon Threads in java?

1210

How transient variable is different from volatile variable?

1086

How is java hashmap implemented?

1034

How to call one constructor from the other constructor ?

1069

What is canonical name in java?

1151

What is the difference between an object-oriented programming language and object-based programming language?

1012

What do negative exponents mean?

1047

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