If you want to learn java or want to build a career in it or you are already a java developer then these JAVA Interview Questions with Answers will help you a lot.This is a series of questions and answers from beginner level to expert level and here are first 15 Questions and Answers.
What does a well-written OO program look like?
Can you have virtual functions in Java?
Jack developed a program by using a Map container to hold key/value pairs. He wanted to make a change to the map. He decided to make a clone of the map in order to save the original data on side. What do you think of it? ?
What is more advisable to create a thread, by implementing a Runnable interface or by extending Thread class?
What is NullPointerException and how to handle it?
An application needs to load a library before it starts to run, how to code??
How could Java classes direct program messages to the system console, but error messages, say to a file?
What's the difference between an interface and an abstract class?
Name the containers which uses Border Layout as their default layout?
What do you understand by Synchronization?
What is Collection API?
Is Iterator a Class or Interface? What is its use?
What is similarities/difference between an Abstract class and Interface?