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Java is a high-level programming language which provides OOP (Object Oriented Programming). Java is easy to write, compile, debug, and learn. Object Oriented Programming (OOP) allows us to create modular programs and reusable code. The code written in Java is platform independent, i.e., a code written in any machine can be used in a different machine for the same purpose. Sun Microsystems developed Java. Java is widely used for creating applications, games, and websites. Here we are going to discuss the most asked Java interview questions. 1. What are the features of Java programming language? Answer: Java has the following features: - Java provides Object-Oriented Programming. - Java provides inheritance. - Java provides polymorphism. - Java provides encapsulation. - Java provides abstraction. - Java is platform-independent. 2. What is a class in Java? Answer: A class can be considered a group of objects that has common properties. A class is like an object constructor or a blueprint for creating objects. A class in Java can contain methods, fields, constructors, blocks, and nested classes. 3. What is inheritance? Answer: Inheritance means a sub-class inherits the properties of the class from which it is derived, or in other words, inheritance means one class can extend another class. The derived class is known as a sub-class, whereas the existing class is known as the superclass. Inheritance is only applicable in the case of public and protected members of a class. Private members cannot be inherited. 4. What is polymorphism? Answer: Polymorphism is the capability of a message to be displayed in multiple forms. Polymorphism allows us to perform a single task in various alternatives. The word poly means many, while morph means numerous. Thus the word polymorphism translates to multiple forms. 5. What is meant by encapsulation? Answer: Encapsulation is the process of wrapping up data together into a single unit. Encapsulation provides control over the data, and helps to achieve data hiding. 6. What are the different access modifiers in Java? Answer: The access specifiers are used to define the restriction on the access of the class and members of a class. Java provides four access modifiers which are listed below: - Private - Public - Protected - Default 7. Why is Java not considered as completely object-orientedd? Answer: Java is not considered wholly object-oriented because Java uses eight primitive data types (boolean, byte, char, int, float, double, long, short), which are not objects. 8. What is a wrapper class in Java? Answer: We can convert the Java primitives into objects using a wrapper class. 9. What are constructors in Java? Answer: Constructor refers to a code block using which we can initialize an object. Constructors also have the same name as the class. Constructors are called automatically during the creation of the class. Constructors have no return type. 10. Why are pointers not used in Java? Answer: Java does not provide pointers because they increase the program's complexity and are unsafe. Java is a simple programming language, so adding it would contradict the fact. 11. What is Object Oriented Programming (OOP)? Answer: Object Oriented Programming (OOP) is a method of programming that organizes the software design around data or objects rather than functions and logic. Object Oriented Programming (OOP) is one of the most popular programming models. It suits well for complex and large problems. More on reddit.com

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