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,

1058

Does java support multiple inheritance or not?

Hexaware,

1106

How can you read content from file in java?

HCL,

1006

What is run time allocation?

Fidelity,

1025

How can we avoid including a header more than once?

Fidelity,

1040

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

GrapeCity,

1028

Where to store local variables?

Aspiring Minds,

1106

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

Aspire, Infogain,

1294

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

Hexaware, Virtusa,

1277

How can I right-justify a string?

Aspire, Infogain,

1181

How would overload a function based on return type?

Genpact,

969

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,

1161

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

Aspire, Infogain,

1034

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

Ciena,

1094

Explain Basics of OOP Language in java

Atos Origin,

1062

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Un-Answered Questions { Core Java }

Explain java coding standards for methods?

1047

What methodology can be utilized to link to a database?

967

How do you print array in java?

992

What is var keyword ?

1191

How do you convert int to char in java?

1073

why are wait(), notify() and notifyall() methods defined in the object class? : Java thread

990

How many bits is size_t?

995

What is the purpose of stub and skeleton?

1034

Is java code slower than native code?

1066

What type of value does sizeof return?

1007

What is byte code and why is it important to java’s use for internet programming?

1132

Explain oops concepts in detail?

1029

What must a class do to implement an interface in java programming?

1059

What is use of arraylist in java?

1179

What is the point of java?

1024

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