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,

2482

why an outer class cannot be declared as private?

1 4309

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

3 6499

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

Nokia,

8 32876

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

TCS,

2 5176

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

IBM, TCS,

3 8469

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

HCL,

3 8898

Static Variable can referred in non-static method?

3 5504

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 5679

Why transient variables wont participate in serialization?

2 6284

what is ststic with example

Wipro,

2043

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

Accenture,

1 11409

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

ITC Infotech,

4 7474

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 10914

how to identify duplicate values in arraylist

TCS,

2 5501

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Un-Answered Questions { Core Java }

How do you represent a space in regex java?

1010

What is slash r?

1007

Can we assign integer value to char in java?

1027

What is string subsequence method?

1119

Write a java program to count the number of words present in a string?

980

What is a constructor overloading in java?

1034

Define inheritance with reference to java.

1087

How is it possible in java programming for two string objects with identical values not to be equal under the == operator?

1023

Can a class be a super class and a sub-class at the same time? Give example.

1546

What access modifiers can be used for class ?

1019

Explain the difference between throw and throws in java?

996

What is currentthread()?

990

What is the major difference between linkedlist and arraylist?

1037

What does java final mean?

1029

Addition to previous section relative word 5th one was Putrid ans: rotten, also there was prob. in 1st section on bucket weight ans:10kg, also there was a prob. on train speed to find bridge length ans:800 mtrs.

2166

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