What is an abstract class and what is it’s purpose?

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Explain when noclassdeffounderror will be raised ?

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What is java virtual machine? Explain

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Why null interfaces are used in Java?

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What is the difference between yielding and sleeping?

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What is a boolean in java?

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In the first round, there are 30 aptitude and 30 java questions. We are suppose to finish both the papers within 60 minutes. I cleared this round. Next was test for programming skills. In this section, Some 7 n's were asked. 1. What is the difference b/w sleep(1000) and wait(1000) 2. what is the diff b/w static block and static function? 3. Write a program to validate IP address using string tokenizer. 4. Write a program to create singleton class 5. write a function to reverse the string 6. Write a prog to print prime nos upto n. EX: If n=9, It shld print 1,2,3,5,7 7. One program on collections- Write a program to print no. of times a number is repeating in an array. EX- {1,3,1,2,5,7,3,7,34,3,8,3} It should print: 1- 2 times 3- 4 times and so on 7. Write a func to print fibonocci series After this I had technical interview, which went on for. 60 mins or so. There were qn's about multi threading, Exception handling and collection classes. Knowledge about collections was very important for the post I was interviewed for.

1 Answers   Huawei,

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Can constructor return value?

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What is type safety in java?

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What is serializable interface?

13 Answers   Infosys, Probity Soft, Seed Infotech,

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Can you explain inner class.

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Can we use both this () and super () in a constructor?

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