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

Core Java Interview Questions

Questions Answers Views Company eMail

Explain parallel processing in java8?

1252

Explain the difference between map and flatmap stream operation?

1268

Write a program to print 15 random numbers using foreach of java 8?

936

Explain the difference between intermediate and terminal operations in java8?

1115

Write a program to print count of empty strings in java 8?

1006

Explain spliterator in java8?

1047

Explain the difference between collection api and stream api in java8?

974

How to create a base64 decoder in java8?

1057

What is the difference between array and array list in java?

1231

What is the difference between hashmap and hashtable in java?

1124

What is the difference between hashset and treeset in java?

1068

What is the base class of all exception classes?

1066

What's the default access specifier for variables and methods of a class?

1120

How can we make copy of a java object?

1152

What's the base class in java from which all classes are derived?

1266

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Un-Answered Questions { Core Java }

Can we use a switch statement with strings?

1051

What are the differences between wait() and sleep()?

1016

What is string substring?

1172

What is private protected in java?

1052

Can we write method inside a method in java?

989

What is a static class in java?

1012

How do you escape json?

995

How will you initialize an Applet?

1150

What is garbage collection? What is the process that is responsible for doing that in java?

1103

What are 3 boolean operators?

1007

Is singleton class immutable?

966

What is the best way to findout the time/memory consuming process?

1032

What is an object in java and how is it created?

1056

Are floats faster than doubles?

1063

What is variable explain?

1003

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