Questions on various topics in Java, along with their answers
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Techincal

  1. What is Java? Java is a general-purpose, class-based, object-oriented programming language that is specifically designed to have as few implementation dependencies as possible.
  2. What are the key features of Java? Some of the key features of Java include:
  • Object-oriented
  • Platform-independent
  • Simple
  • Secure
  • Portable
  • Robust
  • Multithreaded
  • High performance
  • Dynamic
  1. What is the difference between Java and JavaScript? Java is a programming language, while JavaScript is a scripting language. Java is used to build standalone applications, while JavaScript is used to add interactivity to web pages. Java is a compiled language, while JavaScript is an interpreted language.
  2. What is the Java Development Kit (JDK)? The JDK is a software development kit that includes the Java Runtime Environment (JRE), the Java compiler, and other tools needed to develop Java applications.
  3. What is the Java Runtime Environment (JRE)? The JRE is a software package that contains the Java Virtual Machine (JVM) and other libraries needed to run Java applications.
  4. What is the Java Virtual Machine (JVM)? The JVM is a virtual machine that runs Java bytecode and provides a runtime environment for Java applications.
  5. What is a Java bytecode? Java bytecode is a compiled code that can be run on any device that has a Java Virtual Machine (JVM) installed.
  6. What is a Java class? A Java class is a template for creating objects. It defines the variables and methods that will be available to the objects created from the class.
  7. What is an object in Java? An object in Java is an instance of a class. It has its own state, behavior, and identity.
  8. What is inheritance in Java? Inheritance in Java is a mechanism that allows a class to inherit properties and methods from a superclass. This allows for code reuse and promotes code modularity.
  9. What is polymorphism in Java? Polymorphism in Java refers to the ability of a single object to take on multiple forms. This is achieved through inheritance, method overloading, and method overriding.
  10. What is an interface in Java? An interface in Java is a set of abstract methods that must be implemented by any class that implements the interface. Interfaces are used to specify a set of behaviors that a class must implement, without defining how those behaviors are implemented.
  11. What is an abstract class in Java? An abstract class in Java is a class that cannot be instantiated, but can be extended by other classes. Abstract classes are used to define common behavior that can be shared by multiple classes.
  12. What is the difference between an interface and an abstract class in Java? An interface in Java is a set of abstract methods that must be implemented by any class that implements the interface. An abstract class, on the other hand, can contain both abstract methods (methods with no implementation) and concrete methods (methods with an implementation). Classes can only extend one abstract class, but they can implement multiple interfaces.
  13. What is a package in Java? A package in Java is a collection of related classes and interfaces. Packages are used to organize classes and interfaces in a logical manner and to prevent naming conflicts.

Here are five multiple choice questions on various topics in Java, along with their answers:

  1. What is the default value of a local variable in Java?
    • a. null
    • b. 0 c. undefined
    • d. not assigned
    • Answer: c. undefined
  2. What is the correct way to declare and initialize a two-dimensional array in Java?
    • a. int[][] arr = new int[][];
    • b. int[][] arr = new int[2][2];
    • c. int arr[][] = new int[2][2];
    • d. int arr[][] = {{1, 2}, {3, 4}};
    • Answer: d. int arr[][] = {{1, 2}, {3, 4}};
  3. Which of the following is NOT a Java access modifier?
    • a. public
    • b. private
    • c. protected
    • d. static
    • Answer: d. static
  4. What is the return type of the main() method in Java?
    • a. void
    • b. int
    • c. String
    • d. void main()
    • Answer: a. void
  5. What is the correct way to import a package in Java?
    • a. #import packageName
    • b. using packageName
    • c. import packageName
    • d. include packageName
    • Answer: c. import packageName

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