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Java Interview Questions

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0

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13
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Write a function to generate pascal triangle (use recursion)

public static int[] generatePascal(int level)
- chad August 05, 2015 in United States | Report Duplicate | Flag | PURGE
Expedia Software Engineer / Developer Java
0

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5
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How do you decide whether we should use Java or C++ for a particular project . what are pros and cons
- chad August 01, 2015 in United States | Report Duplicate | Flag | PURGE
Bloomberg LP SDE-2 Java
0

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1
Answer
How does garbage collector work ? In mark and sweep , how does gc know which objects it needs to mark , how are references stored for objects for gc to understand that its reference is null or it is no more referenced anywhere j
- chad August 01, 2015 in United States | Report Duplicate | Flag | PURGE
Bloomberg LP SDE-2 Java
0

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1
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There are five classes having inheritance a,b,c,d,e. We have to solve an equation with all the possible methods defined in the above classes.We have multiply(), add(),subtract() and divide() methods in the above classes.
- manishvashishtha01 July 28, 2015 in United States | Report Duplicate | Flag | PURGE
Java
1

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0
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Given a hashmap, HashMap<String,List<String>> with the following data:

A: B,C
B: X Y
X: Z
Y: Z

Expected output is an array of the dependencies. I initially started with Breadh-first search for simplicy, which had running O(|V|+'E') and space O(|V|). The interviewer said depth-first search is better; I don't see how DFS is better, because it requires recursion.

Part2: He then said my solution is functionally correct and then introduced a circular dependency and asked how to resolve it. I said using a visited hashset will detect a circular dep. He said it's not quite right and there a few approaches.
- Yev July 16, 2015 in United States | Report Duplicate | Flag | PURGE
Here Software Developer Java
0

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0
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Given a string of english characters. Find the character that appears only once. I used arr[256] to store a count of each character. Then, iterate over the array to find the first non-dup, a[iter+'a']==1. The interviewer thought that storing a[iter]='x' (dup) and a[iter]=<index> was a better solution to avoid running a second pass over the string. In my mind, I disagreed using the array index, one can find the character that appears only once. The interviewer persisted, and told me to think about it.
- Yev July 16, 2015 in United States | Report Duplicate | Flag | PURGE
Here Software Developer Java
0

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3
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Passing objects and correct the program:---

class OdemoA
{
int i,j;
void function1(int i)
{
System.out.println(i);
System.out.println("Inside function()");
}
void function2(Area a1)
{
if(a1!=null)
{
a1.i=203;
a1.j=115;
}
System.out.println(a1);
System.out.println("end of function2()");
}
public static void main(String args[])
{
OdemoA d1 = new OdemoA();
Area a2 = new Area();
d1.function2(a2);
System.out.println(a2.i);
System.out.println("end main");
}
}
- Avinash July 14, 2015 in United States | Report Duplicate | Flag | PURGE
ADP Developer Program Engineer Java
0

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5
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Hello , I must write a program that given the elements in a list , generates all combinations of these elements .
For example, if I [A, B , C ] , the possible combinations are [ A] , [B ] , [ C ] , [A, B ] . [ A, C ] , [ B, C ] , [A, B , C ] . Another example , having [ A, A, B] the possible combinations are [ A] , [ A, A ] , [A, B ] , [ A, A, B, A ] .

How can I write it in java ?
- pasquale.restaino1992 July 06, 2015 in United States | Report Duplicate | Flag | PURGE
Java
0

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11
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write a java program display the sub string from a string without using string function
- vivek260394 June 11, 2015 in India for 1 | Report Duplicate | Flag | PURGE
Developer Program Engineer Java
0

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0
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Have you done debugging in JVM? How would you do it.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Data Structures Java Knowledge Based Testing test
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6
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what's use of equals and hashcode function?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Coding Hash Table Java Object Oriented Design
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3
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hashmap implementation?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Algorithm Coding Hash Table Java
-1

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1
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vector vs arraylist
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Coding Java Object Oriented Design
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1
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hashtable vs hashmap
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Coding Hash Table Java
0

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4
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Is memory leaks possible in Java?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Java Testing
0

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1
Answer
How Garbage collector know if something is not used and needs to be removed?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Coding Compiler Debugging Java
0

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0
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difference between java7 and java8?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Java
0

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0
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java vs javascript
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Java
0

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0
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stack vs heap
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Ebay Software Developer Java
0

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2
Answers
Does JavaScript has inheritance?
Can you override in JavaScript?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Amazon Software Developer Java JavaScript Object Oriented Design
0

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4
Answers
What's difference between Javascript and JAVA in terms of OOP principles. Provide examples.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Amazon Software Developer Coding Java JavaScript Object Oriented Design
0

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0
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If given a binary file, with data like lat, long, weather, temp in key:value. It's a structured data how would u ingest it. what are the steps that are being taken before Hive process starts.
- serde (serializartion deserialization). parque etc.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Amazon Software Developer Algorithm Data Mining Data Structures Database Distributed Computing Java SQL
0

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0
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After map phase partition, shifting, sorting happen. What does it mean?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Amazon Software Developer Data Mining Data Structures Database Java
0

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1
Answer
What is input split in hadoop.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Amazon Software Developer Data Mining Data Structures Database Java SQL
0

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0
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As I interviewing for Big data position. Asked Hadoop question :-

Difference between TextInput vs Key Value format in Hadoop.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Amazon Software Developer Data Mining Data Structures Database Java design
0

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0
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Design Bing search.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Microsoft Software Developer Algorithm Coding Database Java Object Oriented Design Software Design
0

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0
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What's Hbase, Pig, used for? Why do we need Hbase if we can use Hive to query Hadoop?
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Microsoft Software Developer Data Mining Data Structures Database Distributed Computing Experience Java Knowledge Based Large Scale Computing
0

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2
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What are different phases of Map reduce operation - I think they were looking for split, combiners, partitioners, sorting phases of whole map reduce stage.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Microsoft Software Developer Data Mining Data Structures Database Distributed Computing Java Large Scale Computing SQL
0

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0
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My interview was for big data position for their Search team. They were looking for person with good Hadoop skill set :-

1. Can you describe Hadoop Architecture? What are various components of it (Primary/Secondary namednodes, data node etc)? Explain working of each.
- Tom Walker June 07, 2015 in United States | Report Duplicate | Flag | PURGE
Microsoft Software Developer Data Mining Data Structures Database Distributed Computing Ideas Java
0

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3
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Given Two classes A & B. How will B know if an instance of A is already created?
- SantoshSingh June 02, 2015 in India | Report Duplicate | Flag | PURGE
Oracle SDE-2 Java

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