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 is Vector?Can you elaborate how Vector is Thread safe?

HCL,

3 11991

How to solve the problem of generating the unique hash keys with hash function?

1957

long d =10;int i =0;i=d; /// is this possible? If d is very long number (10 digits or some thing) then?

3 6990

How can we achieve IPC in JAVA?

Wipro,

1 3162

What do you mean by Remote procedure call?

2 5873

Have you worked on bits programming? examples?What is bit? How many bits are there in the byte?

1 4263

What is left shift and right shift?

1 5887

How GC (Garbage Collector) knows the objects reference is unused.Whether GC removes the unused object Parmanently or it maintains something.

2 7395

Why all programming languages have main as a execution starting point?

4 9287

what is private constructor?what are the uses of writing private constructor in our program?

10 22124

What is a thin-client application?

Adobe,

5 33633

What is a J2EE component? List out all the component?

Adobe,

2 31811

What advantage does an entity bean have over a sessin bean?

Adobe,

3 33024

Why would you desing a J2EE application so user data is entered by way of a JSP page and managed by an underlying Java Beans class?

Adobe,

5 22975

Why Java is a platform independent language?

Wipro, Zensar,

6 70305

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Un-Answered Questions { Core Java }

What happens if constructor is private?

1080

How do you use wildcards?

1127

How do you remove an element from an arraylist in java?

1076

What are the four pillars of java?

1277

What is fail fast in java?

1265

Explain about static nested classes in java?

1114

What is the base class for error and exception?

1042

How variables are declared?

1035

How to compare strings in java?

1109

What is lossy conversion in java?

1290

What loop means?

1008

Is java a virus?

1033

What is the difference between normal report & matrix report?

1163

Is empty set an element of empty set?

1174

What is object data type?

1050

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