JAVA PROGRAMMING QUESTIONS AND ANSWERS PDF
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?.
The trick to solving this problem is acquiring resources in an order and release them in reverse order e.
Java Programming Questions and Answers
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. 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. 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. You have to write a java program to reverse a given string using recursive method. This is one of the java logical programs asked in interview. Write a java program to create a pyramid of numbers or any other symbols in pyramid patterns.
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The bundle of java programming interview questions is incomplete without the questions on strings. You will face many questions on string handling in your interview. I have listed some of them in this post.
It is one of them. Write a java program to find duplicate characters and their count in a given string. One more favorite topic of many interviewers is array. You will face many java coding interview questions related to array. In this program, you will learn how to check the equality of two arrays using different methods. Two strings are said to be anagram if they contain same set of characters but in different order.
These type of java programming questions test the coding skills of a candidate.
For example: , , are some Armstrong numbers. In java interview coding questions like this, an interviewer mainly check how do you implement logic in you code.
I think array related programs along with string handling programs are the most asked java programs for interview. In this program, I have discussed two methods to find duplicate elements in the given array.
This is one of the most popular coding interview question asked in Java programming language. Even though, Writing program for Fibonacci series is one of the basic Java program, not every Java developer get it right in interview. 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.
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.
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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.How to find size of current directory?
Which of these access specifiers can be used for an interface? What is the immediate superclass of the Applet class?
It is recommended to handle exceptions with specific Exception instead of handling with Exception root class. There are a lot of functional interfaces in the java. Create a Java program to find middle node of linked list in Java in one pass?
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You also need to explain the time and space complexity for the best, worst, and average case. Which java. Packages Questions and Answers 1.
Insertion sort solution Write a program to implement the insertion sort algorithm in Java.