Java developer Interview Questions in United States

"Junior developers are often responsible for writing the more monotonous and simple code required by senior members of the development team. Because of this, interviews will be designed to test your knowledge of the fundamentals of Java so be prepared to answer technical questions that you likely came across in college. Data structures and algorithms will be heavily emphasised. A bachelor's degree or equivalent work experience is required. "

Java developer Interview Questions in United States

Java developer Interview Questions in United States

In your interview for a java developer position), be prepared to answer technical questions that test your understanding of Java basics. Interviewers may also ask open-ended questions to assess your coding and problem-solving abilities. Prepare for non-technical questions that focus on time management, interpersonal communication, and work ethic.

18,479 Java Developer interview questions shared by candidates

Top Java Developer Interview Questions & How to Answer

Here are three java developer interview questions and how to answer them:

Question #1: What is the difference between HashTable and HashMap in Java?

How to answer: Interviewers use technical questions to assess your formal training and understanding of the Java programming language. Use your answer to demonstrate your communication skills. Even if you have been coding for some time, it can be helpful to review Java basics before your interview.

Question #2: Write a program to determine if 243 is an Armstrong number.

How to answer: Interviewers use open-ended questions to test your coding skills. This question allows the employer to assess your ability to solve a problem using a Java algorithm. Explain your thinking process as you use a code editor or whiteboard to solve the problem.

Question #3: How do you produce quality code when you have several Java projects to complete at once?

How to answer: Java developers often juggle multiple projects at the same time. Interviewers use questions such as this to test your time management and organizational skills. Employers are also trying to assess your commitment to quality work. If you have experience as a developer, include examples from your work history that demonstrate high-quality work and effective time management.

Top Interview Questions

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Insight Global
Junior Java Developer was asked...November 15, 2012

Implement a method to determine whether a string is a palindrome.

4 Answers

Take a string as function parameter. Copy this str value into a new var, then use .reverse() thereupon. Compare the reversed copy back against original string using turnery operator to set resVariable to "true" : "false". Return resVariable. Less

(Using .split(""), as well as .join(""))

const palindrome = (str) => str == str.reversed() palindrome('hello') // false palindrome('eve') // true Less

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Write a function to print the first letter of every word in a string.

4 Answers

public String getFirstLetters(String text) { String firstLetters = ""; text = text.replaceAll("[.,]", ""); // Replace dots, etc (optional) for(String s : text.split(" ")) { firstLetters += s.charAt(0); } return firstLetters; } Less

let sentence = 'Big Green Dog' let words = sentence.split(' ') =>{ word.split('') console.log(word[0]) }) //output "B" "G" "D" Less

public static void PrintFirstLetter( String s ){ If ( s.length == 0 ){ return; } String [ ] Words = s.split( “ “ ); for ( String word : Words ) { System.out.println( word.charAt(0)); } } Less

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How would you scale access to a system like Twitter

3 Answers

I was thinking geographically distributed servers.


There's probably no real correct answer, though the solutions go from common to esoteric in a pretty normal progression: caching, shared-cache like memcache, optimize usage, prefetch, then get creative. This is more about testing reasoning and how far you'll go to solve a problem. Less

Help Scout

Write a method to determine if a string starts with an uppercase letter.

2 Answers

wouldn't it just be return string.charAt(0) == string.charAt(0).toLowerCase()

bool lower(string s) { if (s.length() == 0) {return false;} char f =; return (f > 64 && f < 91); // ascii values } Here’s a C++ implementation that might (not) work. Not so good with Java. Less


1.Java Basics. 2.Plethora of Multithreading questions.GC 3.Simple data structure. (BFS) variation 4.Database Basics

1 Answers

I fumbled in 1 questions which was the nail in the coffin.

N2N Global

Q: Why multiple inheritances are not supported in Java?

1 Answers

Because of diamond pattern, diamond pattern creates ambiguity and make problem for compiler. Anyway java supports multiple inheritances via interfaces. I think more convincing reason for not supporting multiple inheritance is complexity involved in constructor chaining, casting etc rather than diamond. Less

Western Governors University

What does the action and method attribute in the HTML <form> tag do.

1 Answers

action = specifies where to send the form data when form is submitted method = specifies how to send the form data (get or post) Less


Lots of questions about arrays, lists and hashmaps

1 Answers

Focus more on how hashmap works and its applications


If you were responsible for development and launch of a billing system, how would you handle a critical situation?

1 Answers

My answer: 1. Pause or isolate the problematic process/workflow if possible 2. Study the logs and relevant data 3. Try to reproduce locally (in a sandbox) 4. Try to reproduce in staging environment 5. Add and deploy fix, enable the process/workflow back 6. Follow up with affected customers via support Less


attributes of <tr> tag

41 Answers

please let me know if anyone got Job

36. If you get call then follow this interview experience

How many of you waiting after 3rd round

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