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,

1195

How can you read content from file in java?

HCL,

1056

What is run time allocation?

Fidelity,

1079

How can we avoid including a header more than once?

Fidelity,

1077

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

GrapeCity,

1076

Where to store local variables?

Aspiring Minds,

1163

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

Aspire, Infogain,

1389

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

Hexaware, Virtusa,

1339

How can I right-justify a string?

Aspire, Infogain,

1258

How would overload a function based on return type?

Genpact,

1038

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,

1215

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

Aspire, Infogain,

1077

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

Ciena,

1143

Explain Basics of OOP Language in java

Atos Origin,

1110

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Un-Answered Questions { Core Java }

Difference between static and dynamic class loading.

1186

How many bytes are a float?

1036

What is canonical name in java?

1191

How does a for loop work?

1046

What is the range of the short type?

1066

What is a package in java? List down various advantages of packages.

1350

Why hashset is used in java?

1122

Can I override protected method in java?

1135

What is continuity of a function?

1138

Is java still relevant?

1027

What is an error in java?

1206

List some java keywords sun like c, c + + keywords?

1066

What is annotation in java?

1115

Can a method be static?

1027

What is a function easy definition?

1065

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