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Core Java Interview Questions
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Can we use a default constructor of a class even if an explicit constructor is defined?

 657

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

 600

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

 576

When the constructor of a class is invoked?

 597

What is ternary operator? Give an example.

 603

How an object is serialized in java?

 534

When we should use serialization?

 572

What's the base class of all exception classes?

 569

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

 843

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

 535

What is the access scope of protected access specifier?

 540

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

 586

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

 514

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

 575

What is final keyword in java? Give an example.

 580

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Un-Answered Questions { Core Java }

How do you read and print a string in java?

530

What is unmodifiable list in java?

536

What is the difference between overriding & overloading?

567

What are thread local variables?

558

What is character in data type?

553




why Interface used?

541

Difference between final and effectively final ?

641

Can I declare class as static or private?

547

How many tetrahedral voids are there in bcc?

549

How can we access some class in another class in java?

555

What are the different ways of implementing thread? Which one is more advantageous?

540

How variables are declared?

519

What are the basic concepts of OOPS in java?

570

explain autoboxing in java?

598

What is the meaning of immutable regarding string?

524

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