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Java Virtual Machine Applets and Applications Overview

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Questions and Answers

What is a Java Virtual Machine Applet?

A stand-alone Java program
A Java program embedded in a Web page (correct)
A program that supports character output only
A Java program that requires arguments to run

What does 'void' indicate in the context of Java applications?

The main() method is empty
The main() method returns a value when called
The main() method is not accessible
The main() method does not return a value when called (correct)

What is required for an identifier in Java applications?

Can only contain digits and hyphens
Cannot be a Java reserved keyword (correct)
Cannot begin with an English letter
Can begin with a digit

What type of error is a logic error in Java applications?

An error that produces incorrect results during execution (A) Signup and view all the answers

When defining a Java class, what must identifiers begin with?

A non-English letter like α (C) Signup and view all the answers

What does the 'static' keyword define in Java applications?

'static' means the method is accessible even without objects of the class (A) Signup and view all the answers

Which of the following is NOT a type of Java comment?

Paragraph comment (B) Signup and view all the answers

What is the purpose of comments in a Java program?

To provide documentation and notes (C) Signup and view all the answers

What is a constant in Java?

A value that cannot be changed while the program is running (A) Signup and view all the answers

What is a variable in Java?

A named memory location used to store a value (B) Signup and view all the answers

What is the purpose of the assignment operator (=) in Java?

To assign a value to a variable (A) Signup and view all the answers

What is the difference between a primitive type and a reference type in Java?

Primitive types are simple data types, while reference types are more complex (A) Signup and view all the answers

What is a key characteristic of encapsulation in object-oriented programming?

It provides security by concealing internal values and methods from outside sources. (B) Signup and view all the answers

What is the primary purpose of the Java Virtual Machine (JVM)?

To enable Java programs to run on a wide variety of computers. (A) Signup and view all the answers

What is the purpose of a development environment in Java programming?

To provide a set of tools for writing Java programs. (D) Signup and view all the answers

What is the relationship between inheritance and polymorphism in object-oriented programming?

Inheritance allows classes to share attributes and methods, while polymorphism enables objects to take on multiple forms. (A) Signup and view all the answers

What is the purpose of bytecode in Java programming?

To convert source code into a binary program that can be executed by the Java interpreter. (B) Signup and view all the answers

What is a key advantage of Java as a programming language?

It provides security features and can run on a wide variety of computers. (A) Signup and view all the answers

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