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 ?

1062

What are different types of inner classes ?

1054

What is stringjoiner ?

961

Difference between final and effectively final ?

1107

Difference between abstract and concrete class ?

1178

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

1086

Can we access instance variables within static methods ?

1095

What is the use of optional ?

1035

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

988

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

993

Similarity and difference between static block and static method ?

919

Difference between class#getinstance() and new operator ?

1209

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

1108

Describe what happens when an object is created in java ?

1010

Difference between == and .equals() ?

1002

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Un-Answered Questions { Core Java }

Why wait and notify methods are declared in object class?

1041

Suppose if we have variable ' I ' in run method, if I can create one or more thread each thread will occupy a separate copy or same variable will be shared?

1055

What is the difference between stringbuffer and stringbuilder?

1057

What is the difference between scrollbar and scrollpane?

1090

I don’t want my class to be inherited by any other class. What should I do?

1015

Explain public static void main(string args[]).

1180

What class allows you to read objects directly from a stream?

1321

Is an empty arraylist null?

1097

What is constructor chaining and how is it achieved in java?

1154

Can an interface implement another interface?

1035

What is the difference between keyword and identifier?

1025

How do you create immutable object in java?

1049

Is class forname reflection?

990

Is a case study a method or methodology?

899

What is tcp and udp?

1018

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