## Java Interview Questions

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

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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

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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

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Do thread join without join function?

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how to sent buffer limit in BufferedReader/ BufferedWriter class

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

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Chinese chess has 8*8=64 cells.And the point is (1,1),ï¼ˆ1ï¼Œ2ï¼‰,..............(8,8ï¼‰.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)

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Chinese chess has 8*8=64 cells.And the point is (1,1),ï¼ˆ1ï¼Œ2ï¼‰,..............(8,8ï¼‰.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)

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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)

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Write a Java program to find out minimum numbers from fibonacci series 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)

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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

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

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How to implement split () method

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How to implement split () method

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

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

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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 â€˜9â€™ and â€˜0â€™ 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.

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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.

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What is the diffenrce between join() and wait()?

What is sleep(). Which method releases the lock?

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How can we implement asynchronous call in Java? Say I want to query Google but donâ€™t want to use all the urls want to use later. How can we do that?

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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?

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

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Judgement Day

Skynet has figured out a way to take over the world. It will keep producing robots and molecular assemblers until it has converted all matter for its own purpose. Robots work to produce more robots and molecular assemblers. Molecular assemblers convert matter into programmable matter to be used to produce more robots and molecular assemblers.

Initial Info On day 0, Skynet started with 3 robots, 1 molecular assembler and 0 units of programmable matter.

On day i (i>0), robots produced can be calculated as the sum of the robots produced on the previous day and thrice the units of programmable matter produced on the previous day.

On day i, number of molecular assemblers produced can be calculated as the sum of robots produced on the previous day and twice the units of programmable matter produced on the previous day.

On day i, the units of programmable matter produced can be calculated as five times the number of molecular assemblers produced on the previous day.

How many robots, molecular assemblers and units of programmable matter will be produced on the Judgement Day (day n)?

Input/Output Specifications

Input format: Two integers x and y (1<=x,y<=10^6) such that the judgement day falls on day n = x*y.

Output format: Since the number of robots, molecular assemblers and units of programmable matter grows very rapidly, we want you to output them modulo 1000000007.

The output should be a string having the following format: R#M#P, where - R is the number of robots produced on judgement day modulo 1000000007 - M is the number of molecular assemblers produced on judgement day modulo 1000000007 - P is the number of units of programmable matter produced on judgement day modulo 1000000007

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Distributing Medals It's the medal distribution ceremony. 10^6 police officers, numbered from 1 to 10^6, are standing in a line. There are N (1<=N<=1000) iterations of medal distribution. In iteration i (0 < = i < N), count[i] ( 1 < = count[i] < = 100) medals are given to all officers from from[i] to to[i] ( 1 < = from[i] < = to[i] < = 10^6 )

If we sum up the number of medals received starting from the first officer, who would be the first officer for which the cumulative sum exceeds a given medal count THRESHOLD ( 1 < = THRESHOLD < = 10^9 )?

Input/Output Specifications Input format:

You are given 5 inputs:

input1 = N, the number of iterations

input2 = count, the array of medal counts in each iteration

input3 = from, the array of starting indices in each iteration

input4 = to, the array of ending indices in each iteration

input5 = THRESHOLD, the medal count threshold

Output format:

An integer, representing the number of the first officer such that the cumulative sum of medals starting from the first officer upto this officer exceeds THRESHOLD. The output should be -1 if such an officer does not exist

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Judgement Day

Skynet has figured out a way to take over the world. It will keep producing robots and molecular assemblers until it has converted all matter for its own purpose. Robots work to produce more robots and molecular assemblers. Molecular assemblers convert matter into programmable matter to be used to produce more robots and molecular assemblers.

Initial Info On day 0, Skynet started with 3 robots, 1 molecular assembler and 0 units of programmable matter.

On day i (i>0), robots produced can be calculated as the sum of the robots produced on the previous day and thrice the units of programmable matter produced on the previous day.

On day i, number of molecular assemblers produced can be calculated as the sum of robots produced on the previous day and twice the units of programmable matter produced on the previous day.

On day i, the units of programmable matter produced can be calculated as five times the number of molecular assemblers produced on the previous day.

How many robots, molecular assemblers and units of programmable matter will be produced on the Judgement Day (day n)?

Input/Output Specifications

Input format: Two integers x and y (1<=x,y<=10^6) such that the judgement day falls on day n = x*y.

Output format: Since the number of robots, molecular assemblers and units of programmable matter grows very rapidly, we want you to output them modulo 1000000007.

The output should be a string having the following format: R#M#P, where - R is the number of robots produced on judgement day modulo 1000000007 - M is the number of molecular assemblers produced on judgement day modulo 1000000007 - P is the number of units of programmable matter produced on judgement day modulo 1000000007

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Write a java program read 3 numbers and line length make triangle..find whether triangle is isosceles or equilateral triangle,also find out rightangle triangle?

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Write a java program multiply two 10-digit numbers and the number is very large number(10,000) ten thousand digits,don't use any built-in functions?

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What is out in System.out.println(). How can we redirect System.out.println to file than showing on console? Say we have

System.out.println("Hello World!!"). We want "Hello World!!" written to file than showing on console.

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How can you handle uncheckedexceptions globally in project?

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