Top 10 Java Programming Coding Interview Questions Answers for programmers Java coding interview questions answers Java coding interview questions are mostly some programming exercises which is asked to be solved in java programming language in limited time during any core Java or J2EE interview. No matter whether you have 2 years of experience or 4 years of experience, There is always some coding interview question in Java programming job you are applying. Actually questions related to Java Coding are increasingly getting popular on Java interviews for two reasons, first its difficult to crack Java coding interview questions than answering fact based questions like Why String is immutable in Java or Why main is static in Java ; Second reason of popularity of Coding question in Java interviews is read need of good developers who are required to do lot of coding in projects rather than doing some maintenance works. These Coding interview questions are collected from various Java programming interviews, from friends and colleagues and can be a good starting point to refresh your coding skills before appearing on any Java interviews.
Top 50 Java Programs from Coding Interviews Coding is an integral part of any programming job interviews Java development interviews are no exception.
I would even suggest you should never hire anyone without testing their coding skillcoding is also an art and more often than a good code is a good developer as well.
If you look at tech giants like Amazon, Facebook, and Google they thoroughly test the coding skill of any developer they hire, particularly Amazon who first send online coding exercises to filter Java programmers who can code. This online test usually gives you requirements and ask you write a program in limited time usually 2 to 3 hours.
The program should meet the output given by the exercise itself. These type of exercises are very tough to crack if you don't have a good coding skill. Btw, the most important question is how do you develop that kind of coding skill in the first place? Well, things always start small and if you pay attention, there are many Java Job interviews where you would have been asked to write small programs.
They are simple but yet they give a good indication of coding skill of perspective candidates. They are usually preferred by many companies because it usually requires 10 to 20 minutes to write the solution and discuss them. In this list, I am going to share 50 of such small programs from Java Programming interviews.
These programs are from various Data Structure and Algorithm topics e. If you don't have a good knowledge of Data structure and algorithm, I suggest you to first read a good book on Data Structure and Algorithms e.
Introduction to Algorithms by Thomas H. If you find that book difficult, you can get more options in my post about algorithm books here. As I said it includes questions from problem-solving, linked list, array, string, matrix, bitwise operators and other miscellaneous parts of programming.
Once you gone through these questions, you can handle a good number of questions on real Job interviews. Fibonacci series solution Write a simple Java program which will print Fibonacci series e. Be prepare for cross questions like using iteration over recursion and how to optimize the solution using caching and memoization.
Prime number solution Write a Java program to check if a given number is prime or not. Remember, a prime number is a number which is not divisible by any other number e. Be prepared for cross e. String Palindrome solution You need to write a simple Java program to check if a given String is palindrome or not.
A Palindrome is a String which is equal to the reverse of itself e. Though be prepared with both recursive and iterative solution of this problem.
The interviewer may ask you to solve without using any library method e. Integer Palindrome solution This is generally asked as follow-up or alternative of the previous program.
This time you need to check if given Integer is palindrome or not. An integer is called palindrome if its equal to its reverse e.
You can use divide by 10 to reduce the number and modulus 10 to get the last digit. This trick is used to solve this problem. Armstrong number solution A number is called an Armstrong number if it is equal to the cube of its each digit. You need to write a program to check if given number is Armstrong number or not.
Avoiding deadlock in Java solution This is one of the interesting programs from Java Interviews, mostly asked to 2 to 3 years of experienced programmers or higher.
Interviewer simply asked you to write code where a resource is accessed by multiple threads. You need to write code in such a way that no deadlock should occur. The trick to solving this problem is acquiring resources in an order and release them in reverse order e.
This way you can avoid deadlock. Factorial solution This is one of the simplest programs you can expect on interviews. It is generally asked to see if you can code or not. Sometimes interviewer may also ask about changing a recursive solution to iterative one or vice-versa.
Reverse a String solution This problem is similar to the String Palindrome problem we have discussed above.
If you can solve that problem you can solve this as well. You can use indexOf or substring to reverse a String or alternatively, convert the problem to reverse an array by operating on character array instead of String.
Remove duplicates from array solution Write a program to remove duplicates from an array in Java without using the Java Collection API.It's also famous In our last article we have seen how to check if a number is prime or not and in this Java programming tutorial we will see a simple Java program to find factorial of a number in Java by using recursion and iteration.
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Enter your email address: Make sure to activate your subscription by clicking on the activation link sent to your email. Factorial program in java with examples of fibonacci series, armstrong number, prime number, palindrome number, factorial number, bubble sort, selection sort, insertion sort, swapping numbers etc.
Let's see the 2 ways to write the factorial program in java. Factorial Program using loop; Factorial Program using recursion in java. Let's. Lisp (historically, LISP) is a family of computer programming languages with a long history and a distinctive, fully parenthesized prefix notation.
Originally specified in , Lisp is the second-oldest high-level programming language in widespread use today. Only Fortran is older, by one year. Lisp has changed since its early days, and many dialects have existed over its history.
Apr 29, · This Blog will introduce you with the Java Programming language. This blog is for everyone, who wants to learn Java programs. here you can find each type of java programs like core java programs, servlets,jsp,struts,hibernate,spring programs etc.
This article will explain you how to find the factorial of a number through iteration as well as recursion. Finding factorial of a number in Java using Iteration Let the number whose factorial is to be found be stored in the variable n.