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 ?

1099

What are different types of inner classes ?

1100

What is stringjoiner ?

1004

Difference between final and effectively final ?

1172

Difference between abstract and concrete class ?

1263

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

1132

Can we access instance variables within static methods ?

1150

What is the use of optional ?

1085

Difference between doublesummarystatistics, intsummarystatistics and longsummarystatistics ?

1028

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

1049

Similarity and difference between static block and static method ?

970

Difference between class#getinstance() and new operator ?

1273

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

1154

Describe what happens when an object is created in java ?

1063

Difference between == and .equals() ?

1036

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Un-Answered Questions { Core Java }

Can you sort a list in java?

1027

How many characters is 2 bytes?

1034

Give differences between Quicksort &Mergesort. When should these sorts be used andwhat is their running time in java?

1285

What is the purpose of using javap?

1154

How many types of flags are there?

1060

Is string passed by reference in java?

1042

Which collection is best for sorting in java?

1168

What is the final class modifier?

1084

Explain the difference between hashmap and hashtable in java?

988

Why string is a class?

995

What is the primitive type byte?

1041

How do you empty a list in java?

1016

What are the two types of streams offered by java 8?

979

What causes memory leaks in java?

979

Differences between C and Java?

1282

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