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Core Java Interview Questions
Questions Answers Views Company eMail

Can we use a default constructor of a class even if an explicit constructor is defined?

 644

What's the purpose of static methods and static variables?

 586

What is the difference between comparison done by equals method and == operator?

 566

When the constructor of a class is invoked?

 582

What is ternary operator? Give an example.

 589

How an object is serialized in java?

 522

When we should use serialization?

 558

What's the base class of all exception classes?

 559

In multi-threading how can we ensure that a resource isn't used by multiple threads simultaneously?

 829

What are the two environment variables that must be set in order to run any java programs?

 521

What is the access scope of protected access specifier?

 531

A person says that he compiled a java class successfully without even having a main method in it? Is it possible?

 577

What's the purpose of using break in each case of switch statement?

 501

What are java packages? What is the significance of packages?

 561

What is final keyword in java? Give an example.

 574

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Un-Answered Questions { Core Java }

Is string serializable in java?

538

How do you sort arraylist in descending order?

570

What is the significance of continue jump statement? Explain with an example.

736

What is string data?

548

Why static functions are used?

561




what is thread? What are the high-level thread states? Or what are the states associated in the thread? : Java thread

490

What is the purpose of the strictfp keyword?

605

What is Major and importance difference between for and foreach loop ?

568

How does class forname work in java?

475

Which collection is ordered in java?

527

What is the synonym of procedure?

526

What are operators and its types?

567

What is the difference between math floor and math round?

493

What are constants and how to create constants in java?

551

What is the concatenation operator in java?

570

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