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

Core Java Interview Questions

Questions Answers Views Company eMail

why the constructor should be used in class,if there is no constructor what will happen?

4 7785

explain the clone method and clonable interface

1 7584

what are depricated methods in threads and explain the lifecycle methods

CTS,

5 12812

explain the classification of exception and hoew to handle the exceptions

2 10031

what is java

10 11474

what is Assertion?

Wipro,

4 15124

When does the compiler supply a default constructor for a class?

TCS,

9 18322

Which Math method is used to calculate the absolute value of a number?

Accenture,

3 9954

How does serialization work

Ordain Solutions,

3 11094

To what value is a variable of the Boolean type automatically initialized?

3 8522

What is the exact difference in between Unicast and Multicast object ?

Accenture,

4 26895

What is the difference between Stream Reader and Stream Writer?

4 17497

Which class should you use to obtain design information about an object

2 8352

Why we need to serialize the object

CTS, Geometric Software,

11 39862

can we have virtual functions in java?

Wipro,

11 47334

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Un-Answered Questions { Core Java }

Define array. Tell me about 2-D array.

1050

Is it possible to override private or static method in java?

996

Implement a stack with push (), pop() and min() in O(1) time.

1112

Is java a pure object oriented language?

964

What does three dots mean in java?

1126

How can you make sure that your singleton class will always return single instance in multi-threaded environment?

1027

What is the use of join method?

1032

What is difference between public static and void?

1019

Describe 2 different ways to concatenate two strings.

1202

Why do we need data serialization?

993

What is a line separator in java?

980

What is meant by overloading?

1069

What are variable names?

978

What is the current version of java?

1038

Is map sorted in java?

1065

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