CareerCup

Garbage collection in java

We have a folder containing around 10000 files and each file having size greater than 2 GB.These files contain three fields namely date,users and their names.
How can we get the count of all unique users from 10000 files?

How hashmaps are implemented internally, Write data structure definition, one more java question on Equality check for String Pools, String object references.

How to find efficiently the minimum of an array of integers that is the maximum of other arrays?

Example:
A = [126, 110, 130]
B = [125]
C = [105, 115]

The minimum element of array A that is the maximum of B and C is 126

You are given a list of strings

/flapp/server/apache
/d/apps
/d/apps/pub
/flapp
/flocal/firms
/d/sw/java
/d/sw/orcl/jdbc


The filtered strings shoud be
/flapp
/d/apps
/d/sw/java
/d/sw/orcl/jdbc
/flocal/firms

You have to identify the problem/requirement and provide solution that can work for any input with similar pattern.

I have interview with Ericsson:

Working knowledge of server-side JavaScript

Working knowledge of WSDL, XSD and XML

Working knowledge of workflow concepts such as BPM, BPMN, BPML and BPEL.

Working knowledge of HTML

Working knowledge of integration technologies/frameworks including AXIS, SOAP, JMS, HTTP, Socket, FTP, SMTP/POP and integration platforms (EAI, ESB, BPI) such as JMS, MQ, WLI and Tibco

Good design skills

please help if anyone gone through interview process of Ericson.

A program that prints all combinations of a n letter word without using recursion technique.
Example :
Word : abcd
abcd
bacd
cabd
acbd
bcad
cbad
dbac
bdac
adbc
dabc
badc
abdc
acdb
cadb
dacb
adcb
cdab
dcab
dcba
cdba
bdca
dbca
cbda
bcda

Having A List of int [1,1,1,3,1,2,1,1,4,1]

Output needed [1,5,6,3,7,2,8,9,4,10]
Note: Need not to change value of 3,2,4

Implement a Singleton class in java? How will this help?

A server receives requests from different clients...each client send a Runnable job and time on which this job should be run. Write a java program that would accept these jobs and run each job at the required time. Hint: the solution should have a job priority queue to hold the jobs and it should be multithreaded. One thread should accept the tasks, the other one should run the jobs. Also conditions and signalling will be used

You have a class that many libraries depend on. You need to modify the class for one application. Which of the following changes require recompiling all libraries before it is safe to build the application?

a. add a constructor
b. add a data member
c. change destructor into virtual
d. add an argument with default value to an existing member function

Do thread join without join function?

how to sent buffer limit in BufferedReader/ BufferedWriter class

How to implement thread safety in java without using synchronized method?

Chinese chess has 8*8=64 cells.And the point is (1,1),（1，2）,..............(8,8）.And the horse walks by diagonal line of two cells from where point it is.Calculate the shortest step(s) between two points for the horse to walk. Eg. (1,1) to (4,4). Horse go like this (1,1)>(2,3)>(4,4)

Chinese chess has 8*8=64 cells.And the point is (1,1),（1，2）,..............(8,8）.And the horse walks by diagonal line of two cells.Calculate the shortest step(s) between two points for the horse to walk. Eg. (1,1) to (4,4). Horse go like this (1,1)>(2,3)>(4,4)

Write a program to read file of following data structure: Name: favcolor=blue Find out which color is favorite by most people (print the color and number of people)

How many minimum numbers from fibonacci series are required such that sum of numbers should be equal to a given Number N?
Note : repetition of number is allowed.

Example1.

N= 7;
answer = 2 (5 + 2 = 7)

Example 2.

N = 70;
Answer = 3 (34 + 34 + 2)

Given an array of paper products in which each product has an attribute name, width, and height, and given a sheet of paper that has width xx and height yy, write a program that returns the number of sheets of paper needed to print out the array of paper products

Write a program to implement Double Linked List from Stack with min. complexity.

How to implement split () method

How to implement split () method

Write a program to split a string without using split()method

Given a string .Check if the string is palindrome or not

The stepping number:

A number is called as a stepping number if the adjacent digits are having a difference of 1. For eg. 8,343,545 are stepping numbers. While 890, 098 are not. The difference between a ‘9’ and ‘0’ should not be considered as 1.

Given start number(s) and an end number(e) your function should list out all the stepping numbers in the range including both the numbers s & e.

Given two classes C1 and C2 which are almost same.(remember not exactly same).
You want to choose best among these classes so that it can be use as key in hashmap.
What question will you ask regarding two classes C1 and C2.

What is the diffenrce between join() and wait()?
What is sleep(). Which method releases the lock?

How can we implement asynchronous call in Java? Say I want to query Google but don’t want to use all the urls want to use later. How can we do that?

How can we divide a large file between multi threads to process it? If we are running a multi threaded application and input is a large file and we have to provide each thread a part of the file to make it fast. How we can achieve it in java?

If we have all the variables and methods are as static. So would that class be thread safe?