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JAVA PROGRAMMING QUESTIONS AND ANSWERS PDF

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Java Programming questions and answers with explanation for interview, download Java Programming quiz questions with answers as PDF files and eBooks. Sample questions in this book are real interview problems frequently met in the popular programming languages (C, C++, C#, and Java) are discussed in. Java Interview Questions And Answers Pdf Yes, We can Answer: When a Java program contains more than one methods with the same name.


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2 General Questions about Java. 3 Why is Java called the Platform Independent Programming Language? .. Both implementations share some common. Coding is an integral part of any programming job interviews Java development interviews are no exception. I would even suggest you should. Core java Interview questions on Coding Standards. 26) Explain Java Coding Standards for classes or Java coding conventions for classes?.

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.

Top 50 SDET Java Programming Interview Questions & Answers

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.

Java Tutorial Site For Beginners

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. The array can be an array of String, Integer or Character, your solution should be independent of the type of array. If you want to practice more array based questions then see this list of top 30 array interview questions from Java interviews.

Printing patterns solutions Print repeated characters of String? GCD of two numbers solution Square root of number solution You need to write a program to calculate the square root of a number without using the Math. You need to write your logic and method to calculate the square root.

You can though use popular algorithm e. Newton's method. Reverse array in place solution Reverse words of sentence solution Leap year solution Binary search solution String Anagram solution Write a program to check if two given String is Anagram of each other.

Your function should return true if two Strings are Anagram, false otherwise. A string is said to be an anagram if it contains same characters and same length but in different order e. You can ignore cases for this problem but you should clarify that from your interview. You will be given 3 hours to design and code a vending machine satisfying some of the business requirements. You also need to write unit tests to prove your code satisfy those requirements.

Java Questions

You can see this article for more object oriented analysis questions. Reverse a number solution The first non-repeated character of String solution Finding Middle element of linked list in one pass solution Pre-order traversal solution Pre-order traversal without recursion solution In order traversal solution In order traversal without recursion solution Post-order traversal solution Post order traversal without recursion solution Print all leaves of binary tree solution Sort array using quicksort solution You need to write a Java program to sort an array of integers using quick sort algorithm.

You cannot use any library method e. JDK or a third party library, which means, you need to first implement the quicksort algorithm and then sort the array. Insertion sort solution Write a program to implement the insertion sort algorithm in Java.

Java Interview Questions and Answers PDF eBook Free Download (250+ Questions, 60 Pages)

The program should take an unsorted array and sort it using insertion sort algorithm Also explain the best case and worst case time and space complexity of Insertion sort algorithm. Bubble sort solution Write a program to implement the bubble sort algorithm in Java. You can use basic operators and functions but sorting functions from Java API is not allowed. Transpose a matrix solution Print all permutations of String solution Write a Java program to print all permutations of a given String.

For example, if given String is "GOD" then your program should print all 6 permutations of this string e. Reverse a String in place solution Again interview can ask to solve this programming interview question, by using recursion or Iteration.

This Java programming question also test your problem solving skills and if you come up with an original solution, that may even help. See here for complete code example of Fibonacci series in Java FizzBuzz problem : Write a Java program that prints the numbers from 1 to But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both three and five print "FizzBuzz" This is also one of the classical programming questions, which is asked on any Java programming or technical interviews.

This questions is very basic but can be very trick for programmers, who can't code, that's why it is used to differentiate programmers who can do coding and who can't. This is pure Java based Coding exercise.

In order to solve this Java coding or programming interview question you need to know What is a Comparator in Java and how to use compare method in Java for sorting Object. Sorting is one of the most logical and practical question on technical interview and ability to sort Java object is must to code in Java.

Java Programming MCQ - Multiple Choice Question and Answer

This article help you to solve this Java coding question by explaining how to sort object in Java using Comparable and Comparator. Just remember that Comparable has compareTo method and use to sort object based upon there natural order e. A good followup question can also be difference between Comparator and Comparable in Java, so be ready for that. Design a vending machine in Java which vends Item based upon four denomination of coins and return coin if there is no Item.

These kind of problem solving questions in Java are not easy, you need to design , developer and write JUnit test within 2 to 3 hours and only good Java developers, with practical coding experience can solve this kind of Java programming question. What helps you is to keep practicing your coding skill even before interview. See this programming exercise in Java to get yourself going. I personally like to ask programming questions, which test your object oriented design skills e.

Write a Java program to check if a number is Armstrong or not?

Another popular logical coding interview questions in Java, which is based on programming logic. In order to answer this programming question, you need to know what is Armstrong number, but that is not a problem because question may specify that and even provide sample input and output. The key thing to demonstrate is logic to check if a number is Armstrong or not.

In most cases, you can not use utility methods defined by logic and you need to produce logic by yourself by using basic operators and methods. By the way this is also one of the basic programming questions and I have already provided a solution for this.

Some of the programming or coding interview question is always based on fundamental feature of Java programming language e. Since writing deadlock proof code is important for a Java developer, programming questions which requires knowledge of concurrency constructs becomes popular coding question asked in Java Interviews.

The deadlock happens if four condition is true e. If you can break any of this condition than you can create Java programs,which are deadlock proof. One easy way to avoid deadlock is by imposing an ordering on acquisition and release of locks.

Another classic Java programming or coding exercise mostly asked on 2 to 5 years experienced Java interviews. Despite being simple answering this coding question is not easy, specially if you are not coding frequently. Its best to prepare this programming question in advance to avoid any embarrassment during interviews.

I suggest to see this post which shows How to reverse String using recursion in Java Write a Java program to find if a number is prime number or not? One of the simplest coding question and also a very popular Java programming exercise. Beauty of these kinds of logical questions is that, they can really test basic programming skills or a coder, programmer or developer.

Not just problem solving, you can also check there coding style and thought process. By the way. It also covers other important topics e.Answer: Finally block will not be executed whenever jvm shutdowns. Write a java program to find the most repeated word in text file. Once you gone through these questions, you can handle a good number of questions on real Job interviews. Inheritance is performed between two types of classes: Parent class Super or Base class Child class Subclass or Derived class A class which inherits the properties is known as Child Class whereas a class whose properties are inherited is known as Parent class.

Coding is an integral part of any programming job interviews Java development interviews are no exception. What is a constructor overloading in Java?

The program should meet the output given by the exercise itself. Strings Questions and Answers 2. These basics Java Programs and logical questions can also be a good resources for learning programming and to improve your problem solving skills in Java. Can we use catch statement for checked exceptions?

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