It’s natural to be nervous before a job interview, especially when challenged with difficult Java interview questions. However, if you prepare the right way you can kick your nervousness away. With our carefully curated selection of top Java interview preparation questions, you’ll gain the confidence to tackle any interview head-on. Let’s embark on this journey together to get your dream job!
Here are some Java programming practice questions that will help sharpen your skills.
1. What are Some of the Features of Java?
- Object-oriented- Java is a computer language that is object-oriented. This means that the programme we write is organised as a collection of various sorts of objects that have both data and behaviour. Object-oriented programming (OOPs) is an approach that provides basic guidelines to simplify software creation and maintenance.
- Platform-independent- Java is a platform-independent language, which means it can operate on various platforms. Java does this through the use of the JVM and Byte Code. The Java compiler transforms computer code into byte code. Byte code is platform-independent and can be run on any processor or system.
- Portable- Java is portable because it allows you to move Java bytecode from one platform to another. It does not need any implementation.
2. Why is Java Architectural Neutral?
Java is architectural neutral because there are no implementation-dependent features, for example, the size of primitive types is fixed. Its compiler provides an architecture-neutral object file format, allowing the produced code to execute on a wide range of processors with the presence of the Java runtime system.
3. How Java Enables High-Performance?
Java makes advantage of a Just-In-Time compiler to achieve great speed. A Just-In-Time compiler is a programme that converts Java bytecode (a programme with instructions that must be translated) into instructions that can then be given immediately to the processor.
4. Why is Java Considered Dynamic?
Java is considered dynamic because of Bytecode. The source code is written in one platform that code can be executed on any platform. It loads the class file during runtime only. Hence, anything that happens in runtime is dynamic.
5. What is Java Virtual Machine and How is it Considered in the Context of Java’s Platform Independent Feature?
JVM(Java Virtual Machine) acts as a run-time engine to run Java applications. When Java is compiled, it is converted into platform-independent bytecode. This byte code is delivered through the internet and is interpreted by the JVM on the platform on which it is executed.
6. Name Any Two Java IDE’s.
- Eclipse- Eclipse is a well-liked free Java IDE. It supports Apache Groovy, JavaScript, C++, Python, and many other programming languages.
- NetBeans- NetBeans is an integrated development environment for Java. It functions best on Windows, Linux, macOS and Solaris. NetBeans is easy to use and has great project management features.
7. What are Some Java Keywords (unlike C, C++ keywords)?
There are some keywords in Java that are not found in C++. In Java, these keywords have distinct functions. One is Abstract, this is used to declare abstract classes or methods that must be implemented by subclasses. Another keyword is Extends which is performed when one has to indicate a class that is derived from another class.
8. What is Class?
A class is a blueprint for the creation of particular objects. A class can have fields and methods that describe an object’s behaviour.
9. What do you mean by Constructor?
Constructor gets invoked when a new object is created. It is present in every class and if we do not explicitly define a constructor for a class, the Java compiler will create one for us regardless.
10. List the Three Steps for Creating an Object for a Class.
These are the three steps to create an object from a class −
- Declaration − A variable declaration with a variable name with an object type.
- Instantiation − The ‘new’ keyword is used to create the object.
- Initialization − The new keyword is then followed by a call to a constructor. This call initializes the new object.
11. Why is the String Class considered Immutable?
The immutability of the String class ensures that once a string object is created, it cannot be altered. This property enables safe sharing among multiple threads, an important aspect in multithreaded programming.
12. What are Runtime Exceptions?
Runtime exceptions refer to the error that we encounter during the code execution during runtime. They are internal to your application but aren’t always recoverable.
13. When are Throw Keywords Used?
The Throw keyword is used to declare which exceptions can be thrown from a method. It generally appears at the end of a method’s signature. Both checked and unchecked exceptions can be thrown using the throw keyword.
Conclusion
Finally, learning important Java interview questions is required if you are looking for Java developer jobs in this competitive tech industry. At Coffeee.io, we are committed to providing you with extensive information and exciting challenges to help you improve your Java abilities and build your confidence. With our platform’s support and our Java certificate, you can confidently tackle any Java interview, showcasing your expertise and increasing your chances of landing your dream job. Learn with us and excel in your following Java interview!
