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 7673

explain the clone method and clonable interface

1 7511

what are depricated methods in threads and explain the lifecycle methods

CTS,

5 12689

explain the classification of exception and hoew to handle the exceptions

2 9929

what is java

10 11231

what is Assertion?

Wipro,

4 15004

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

TCS,

9 18070

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

Accenture,

3 9818

How does serialization work

Ordain Solutions,

3 10964

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

3 8381

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

Accenture,

4 26723

What is the difference between Stream Reader and Stream Writer?

4 17332

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

2 8263

Why we need to serialize the object

CTS, Geometric Software,

11 39546

can we have virtual functions in java?

Wipro,

11 46965

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Un-Answered Questions { Core Java }

Differentiate between stringbuffer and string?

1002

What are the two main uses of volatile in Java?

1021

What is the difference between declaration and definition in java?

1024

What is illegal identifier in java?

980

Why main function is static?

1167

Define interface in java?

1040

What does || mean in vectors?

899

What does the ‘static’ keyword mean? Is it possible to override private or static method in java?

941

If a class is declared without any access modifiers, where may the class be accessed in java programming?

1163

How to access arraylist elements in java?

955

What is thread count in java?

971

how a programmer confirms that the data submitted has been succesfully inserted into the database(either oracle or my sql).. How a programmer confirm if there is any problem with the program he wrote for insertion... ANS:--- >executeupdate method is having boolean return type, if anything goes wrong in data insertion or data updation, it would return false. otherwise, if it successfully inserts data into the database, it would return true NOW HOW TO I CHECK IN MY DURING EXECUTION WHETHER IT RETURNS TRUE OR FALSE... WELL IT WILL DISPLAY ANY MESSAGE OR NOT

2379

Why does java not allow multiple public classes in a java file ?

4429

What is core java called?

939

What is set string?

1115

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