| Other Core Java Interview Questions |
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| Question | Asked @ | Answers |
| |
| What is multiple inheritance & can we implement it in java? | Satyam | 4 |
| I have an HashMap object, which has with key and value pair.
It has 10 keys and values in that object. Now the question
is I want insert new key and value in middle or any where in
that list but not at the end or at the top. Is it possible
or not. If yes how can we achieve this one? | Huawei | 1 |
| whats the purposr of using serialization? | | 6 |
| Which method will get invoked first in a stand alone
application? | | 1 |
| What are the steps to do connection pooling in weblogic? | TCS | 1 |
| what is the use/perpose of having a method antive? | | 2 |
| whats the diff between jsp and servlets? | HCL | 9 |
| what is the difference between HashMap and Hashtable | Value-Labs | 8 |
| what is main purpose of abstract class? | | 2 |
| What is meant by final class, methods and variables? | | 2 |
| What is the basically use of finally while we know it
is always executed but why? | TCS | 4 |
| Which characters are allowed to use as the second character
of an identifier, and which characters are not allowed? | | 2 |
| Name the types of mouse event listeners ? | | 2 |
| Why Java is a platform independent language? | Zensar | 4 |
| While opening the file, what type of exceptions can be
caught? | | 3 |
| what is the difference between multitasking and
multithreading? | | 8 |
| what is difference between String buffer and String builder? | Benchmark | 2 |
| In Java why we write public static void main(String args[])
why not main()? | TCS | 12 |
| what is synchronization
| | 3 |
| 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. | Huawei | 1 |
| |
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