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

Core Java Interview Questions

Questions Answers Views Company eMail

How many JVMs can run on a single machine and what is the Just-In-Time(JIT) compiler?

Global Logic,

1104

Does java support multiple inheritance or not?

Hexaware,

1198

How can you read content from file in java?

HCL,

1057

What is run time allocation?

Fidelity,

1081

How can we avoid including a header more than once?

Fidelity,

1080

Define max and min heap, also the search time of heap.

GrapeCity,

1080

Where to store local variables?

Aspiring Minds,

1166

How do you declare an array that will hold more than 64KB of data?

Aspire, Infogain,

1396

What is the difference between member variables initialization and assignment in a constructor?

Hexaware, Virtusa,

1343

How can I right-justify a string?

Aspire, Infogain,

1263

How would overload a function based on return type?

Genpact,

1040

Which method you will use to create a new file to store some log data. Each time a new log entry is necessary, write string to the file in java ?

HCL,

1217

Write a program to find the whether a number is an Armstrong number or not?

Aspire, Infogain,

1081

Is it possible to use Semaphore/ Mutex in an Interrupt Handler?

Ciena,

1145

Explain Basics of OOP Language in java

Atos Origin,

1113

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Un-Answered Questions { Core Java }

Why is whitespace important?

1150

Can we use string in the switch case?

1096

What is difference between float and double?

1017

Which data type is a class in java?

1055

what is the difference between yielding and sleeping? : Java thread

1012

What advantage do java's layout managers provide over traditional windowing systems?

1025

What is javac_g?

1077

Explain the use of javap tool.

1190

How is it possible in java programming for two string objects with identical values not to be equal under the == operator?

1064

Should you use singleton pattern?

997

What is an image buffer?

1037

Can we have a try block without catch block?

1054

What do you mean by light weight and heavy weight components?

1070

What is the meaning of 3 dots in java?

1215

What is array list in java?

1131

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