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

Core Java Interview Questions

Questions Answers Views Company eMail

What are the methods of object class ?

766

What are different types of inner classes ?

761

What is stringjoiner ?

737

Difference between final and effectively final ?

820

Difference between abstract and concrete class ?

760

Can we create an object if a class doesn't have any constructor ( not even the default provided by constructor ) ?

760

Can we access instance variables within static methods ?

795

What is the use of optional ?

778

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

759

Difference between final and effectively final ? Why is effectively final even required ?

751

Similarity and difference between static block and static method ?

711

Difference between class#getinstance() and new operator ?

872

What is a lambda expression ? What's its use ?

782

Describe what happens when an object is created in java ?

756

Difference between == and .equals() ?

740

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Un-Answered Questions { Core Java }

What is the difference between processes and threads?

732

How many types of memory areas are allocated by jvm?

751

What do you understand by abstract classes?

821

When should the method invokelater() be used?

753

what is mutual exclusion? : Java thread

761

How does multithreading take place on a computer with a single cpu?

762

What are basic keywords?

777

What are the data types supported by java?

730

What is this keyword used for?

869

What is the scope or life time of instance variables?

868

Why do we use string?

773

How a string is stored in memory?

766

In case of inheritance what is the execution order of constructor and destructor?

858

If an application has multiple classes in it, is it okay to have a main method in more than one class?

748

What are the new features in java 8?

789

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