What modifiers are allowed for methods in an interface?

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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 we write program without class

6 Answers   TCS,

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Give example to differentiate between call by value and call by reference.

0 Answers   TCS,

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What is parsing and its types?

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Explain about anonymous inner classes ?

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what is business delegate?

2 Answers   TCS,

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In multi-threading how can we ensure that a resource isn't used by multiple threads simultaneously?

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What will happen if there is a default method conflict as mentioned above and we have specified the same signature method in the base class instead of overriding in the existing class ?

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What one should take care of, while serializing the object?

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How to add two numbers with out using Arithmetic , union operators in java....? But we can use bitwise operators... but how...?

4 Answers   CTS, Satyam,

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Can one thread block the other thread?

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