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

Core Java Interview Questions

Questions Answers Views Company eMail

Is it possible to write a regular expression to check if string is a number?

1043

What do you mean by aggregation?

1 1348

What are the wrapped, classes?

1066

What is the difference between iterator and enumeration ?

1019

Explain some best practices you would apply while using collection in java?

1052

What is the difference between hashmap and hashtable? What is an interface?

1181

What is starvation?

1337

From the two, which would be easier to write: synchronization code for ten threads or two threads?

1070

What is the difference between abstract classes and interfaces?

1044

What is the difference between dom and sax parser in java?

997

Describe what a thread-local variable is in java?

1030

What is busy spin, and why should you use it?

1105

What are the default and parameterized constructors?

1077

How do you take thread dump in java?

1029

Why java is not 100% object-oriented?

1 1526

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Un-Answered Questions { Core Java }

Is there is any difference between a scrollbar and a scrollpane?

1009

What is Major and importance difference between for and foreach loop ?

1165

Explain the importance of thread scheduler in java?

1030

What are the different types of sorting in java?

995

What is the difference between abstraction and encapsulation?

1061

What is arrays sort in java?

979

How do you achieve singleton?

994

Why method overriding is used?

1116

How many types of the indexof method are there for strings?

987

What is use of static in java?

1194

What is internal variable?

1027

How do you check if two given string are anagrams?

983

What is nextint java?

1080

What restrictions are placed on method overriding?

1202

Can a class be defined inside an interface?

1048

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