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Java Developer Interviews
Java Developer Interview Questions
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.
Top Java Developer Interview Questions & How to Answer
Question 1
Question #1: What is the difference between HashTable and HashMap in Java?
How to answer
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
Question #2: Write a program to determine if 243 is an Armstrong number.
How to answer
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
Question #3: How do you produce quality code when you have several Java projects to complete at once?
How to answer
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.
30,911 java developer interview questions shared by candidates
How can you make your own Immutable class? Java core
If parent class is serialized then how can we avoid serialization for the sub class ?
Questions on serialization and multi threading. Question on strategy design pattern. Basic questions on oracle PLSQL . Performance tuning in java. The interviewer did not know that there exists a try catch block in sql and we can throw and error from the catch block. The interviewer does not know the difference between sqlserver and oracle. He assumes both have the same features.
What is comparator comparable ?
are you interested in this position?
questions on generics, collections, string, JVM, oops concept, enterprise java basics
Assignment is hard if you don't know the various topics but you can google it to finish the project.
public void clearSourceListModel() { sourceListModel.clear(); } public void clearDestinationListModel() { destListModel.clear(); } public void addSourceElements(ListModel newValue) { fillListModel(sourceListModel, newValue); } public void setSourceElements(ListModel newValue) { clearSourceListModel(); addSourceElements(newValue); } public void addDestinationElements(ListModel newValue) { fillListModel(destListModel, newValue); } private void fillListModel(SortedListModel model, ListModel newValues) { int size = newValues.getSize();
import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Arrays; import java.util.Collection; import java.util.Iterator; import java.util.SortedSet; import java.util.TreeSet; // importing xml file import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; import java.io.File; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; // importing xml file import javax.swing.AbstractListModel; import javax.swing.BorderFactory;
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