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

Core Java Interview Questions

Questions Answers Views Company eMail

write a program that list all permutations of ABCDEF in which A appears before B?

Nissan,

2521

why an outer class cannot be declared as private?

1 4383

What is abstraction with strong example program? (not a general program)

3 6621

Why Java is called as purely platform independent..? Explain briefly..dont Give regular answers Explain with your own example..?

Nokia,

8 33242

Can any one say how will sort map objects in java?

TCS,

2 5291

How can u create the Object of class Without using "New" opertor?

IBM, TCS,

3 8597

How can two threads be made to communicate with each other?

HCL,

3 9007

Static Variable can referred in non-static method?

3 5637

when we create singleton design then we create private constructtor..so how JVM take private constructor to make object..but it's private..

Ness Technologies,

1 5784

Why transient variables wont participate in serialization?

2 6446

what is ststic with example

Wipro,

2121

what is purpose of collections.unmodified() method..?

Accenture,

1 11481

what is purpose of writting public static void main(Strind arg[]) in java..?

ITC Infotech,

4 7639

What is the code inside the public void actionPerformed(ActionEvent ae) override method in Applet [ Condition:- you have one TextField and One Button , you have to enter any color name inside the TextField, when you click on Button Your background will change according to your input color name]

IBM,

2 11030

how to identify duplicate values in arraylist

TCS,

2 5633

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Un-Answered Questions { Core Java }

Write a program to print fibonacci series up to count 10.

969

What language is java written?

1058

What is thread life cycle in java?

1136

What is the use of beaninfo?

1099

Is singleton class thread safe?

1054

Can we override constructor in java?

1139

What is append function?

1056

What is the main advantage of passing argument by reference?

1042

Give an example of use of pointers in java class.

1074

Lowest Common ancestor in a Binary Search Tree and Binary Tree.

984

Differentiate between array list and vector in java.

1157

How many types of exception can occur in a java program?

1041

what is the significance of listiterator in java?

1120

Can a constructor be private and how are this() and super() method used with constructor?

1051

How many JVMs can run on a single machine and what is the Just-In-Time(JIT) compiler?

1101

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