Read this free guide below with common Java Programmer interview questions
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Java is one of the most popular programming languages used for developing web and mobile applications. If you are planning to crack an interview for the position of a Java programmer, it is essential to prepare for some commonly asked questions. Here are the top 15 Java programmer interview questions and answers that will help you to prepare better.
Java is a high-level, object-oriented programming language that is designed to be simple, portable, and secure.
JDK (Java Development Kit) is a software development kit used for developing Java applications. JRE (Java Runtime Environment) is a subset of JDK that is used for running Java applications. JVM (Java Virtual Machine) is a virtual machine that is responsible for executing bytecode.
An interface contains only public abstract methods, whereas an abstract class can contain both abstract and non-abstract methods. A class can implement multiple interfaces, but can inherit only one abstract class.
A class is a blueprint that defines the properties and methods of objects. An object is an instance of a class that contains values assigned to its properties.
Method overloading is a technique in Java where two or more methods have the same name but different parameters.
Method overriding is a technique in Java where a subclass provides a different implementation of a method defined in its parent class.
A static method belongs to a class, whereas a non-static method belongs to an object of a class. Static methods can be invoked without creating an object of a class, whereas non-static methods can be invoked only through an object of the class.
The == operator compares the reference of two objects, whereas the equals() method compares the values of two objects.
A constructor is a special method in Java that is used to initialize the properties of an object when it is created.
The final keyword in Java is used to restrict the modification of variables, methods, and classes. A final variable cannot be reassigned, a final method cannot be overridden, and a final class cannot be extended.
ArrayList is implemented as a resizable array, whereas LinkedList is implemented as a doubly linked list. Insertion and deletion operations are faster in LinkedList, whereas random access is faster in ArrayList.
A process is an instance of a running program, whereas a thread is a subunit of a process that can run concurrently with other threads of the same process. A process can have multiple threads.
These are some of the most commonly asked Java programmer interview questions and answers. By preparing well for these questions, you can increase your chances of cracking the Java programmer interview.
When it comes to interviewing for a Java programmer position, preparation is key. It is essential to have a good understanding of the language and its concepts, as well as the ability to apply these concepts in real-world scenarios.
By following these tips, you will increase your chances of success during your Java programmer interview. Remember to practice and stay confident, and you will be well on your way to landing your dream job!
Not asking questions can suggest a lack of interest or preparation. Prepare a few thoughtful questions in advance to show your enthusiasm and curiosity about the role.