Java Fundamentals and Import Statements
20 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the correct index range for accessing elements in an array?

  • 0 to arrayRefVar.length
  • 1 to arrayRefVar.length
  • 0 to arrayRefVar.length-1 (correct)
  • 1 to arrayRefVar.length-1
  • Which type of loop enables you to traverse an array sequentially without using an index variable?

  • enhanced for loop (for-each loop) (correct)
  • for loop
  • do-while loop
  • while loop
  • What is a common programming error that occurs when accessing an array out of bounds?

  • IndexError
  • ArrayOutOfBoundsException
  • ArrayIndexOutOfBoundsException (correct)
  • SyntaxError
  • What error is it called when the first element in an array is mistakenly accessed with index 1 instead of 0?

    <p>Off-by-one error</p> Signup and view all the answers

    What is the entry point where a Java program starts when it is executed?

    <p>The main method</p> Signup and view all the answers

    What does the wildcard import in Java do?

    <p>Imports all the classes in a package</p> Signup and view all the answers

    What is the syntax for accessing modifers while defining a method in Java?

    <p>The first word is lowercase and the first letter of succeeding words is uppercase</p> Signup and view all the answers

    What is required for a value-returning method in Java?

    <p>A return statement</p> Signup and view all the answers

    What does an array variable actually contain in Java?

    <p>Reference to the array</p> Signup and view all the answers

    What does 'WORA' stand for in relation to Java?

    <p>Write once, run anywhere</p> Signup and view all the answers

    What is the correct range of indices for accessing elements in an array in Java?

    <p>0 to arrayRefVar.length-1</p> Signup and view all the answers

    What is the error called when a programmer mistakenly accesses the first element in an array with index 1 instead of 0?

    <p>Off-by-one error</p> Signup and view all the answers

    What type of loop in Java enables you to traverse an array sequentially without using an index variable?

    <p>enhanced for loop (for-each loop)</p> Signup and view all the answers

    What is the common programming error that occurs when accessing an array out of bounds in Java?

    <p>ArrayIndexOutOfBoundsException</p> Signup and view all the answers

    Which statement accurately describes the camel casing convention used in Java?

    <p>The first word is lowercase and the first letter of succeeding words is uppercase</p> Signup and view all the answers

    In Java, what is the role of the main method?

    <p>It is the entry point where the program starts when it is executed</p> Signup and view all the answers

    What is the purpose of using the wildcard import in Java?

    <p>To import all classes from a package</p> Signup and view all the answers

    What is the syntax for declaring an array variable in Java?

    <p>elementType[] arrayName;</p> Signup and view all the answers

    What does the 'WORA' principle stand for in Java?

    <p>Write Once, Run Anywhere</p> Signup and view all the answers

    What happens when you invoke a method with a parameter in Java?

    <p>The parameter's value is passed to the argument</p> Signup and view all the answers

    Study Notes

    Array Indexing and Access

    • The correct index range for accessing elements in an array is from 0 to length-1.
    • Accessing an array out of bounds is a common programming error.
    • This error is known as an ArrayIndexOutOfBoundsException.

    Looping and Array Traversal

    • A for-each loop enables you to traverse an array sequentially without using an index variable.

    Java Basics

    • The entry point where a Java program starts when it is executed is the main method.
    • The main method plays a crucial role in Java, serving as the entry point for program execution.

    Importing and Modifiers

    • The wildcard import in Java allows you to import all classes and interfaces from a specific package.
    • The syntax for accessing modifiers while defining a method in Java is public/private/protected static void-return-type method-name().
    • A value-returning method in Java requires a return statement.

    Array Variables and WORA

    • An array variable in Java contains a reference to the array, not the actual array elements.
    • 'WORA' stands for "Write Once, Run Anywhere", which is a fundamental principle in Java, enabling platform independence.

    Method Invocation and Parameters

    • When you invoke a method with a parameter in Java, the parameter value is passed to the method.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of Java fundamentals such as class definitions and the main method, as well as different types of import statements. Learn about the platform-independent nature of Java and the 'write once, run anywhere' principle.

    More Like This

    Use Quizgecko on...
    Browser
    Browser