EIE3320 Java Programming Basic Quiz
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Questions and Answers

What is the purpose of the following Java program?

  • To prompt the user to enter a number for radius
  • To read the radius of a circle and compute its area (correct)
  • To print a message asking for a double value
  • To display the result of a circle's area computation

    • Which statement is used to create a Scanner object in Java?

  • Scanner(System.in); input = new Scanner;
  • Scanner input = new Scanner(System.in); (correct)
  • Scanner(System.in) input = new Scanner;
  • input = new Scanner(System.in);

    • What is the purpose of the 'prompt the user to enter a radius' statement in the program?

  • To initialize the value of radius
  • To request the user to input a value for radius (correct)
  • To calculate the area of a circle
  • To display the result of the area computation

    • What value is used to approximate pi in the program?

    <p>3.14159</p> Signup and view all the answers

    In Java, what is the purpose of the 'import java.util.Scanner;' statement in the program?

    <p>To import the Scanner class from the java.util package</p> Signup and view all the answers

    What does 'System.out.print("Enter a double value: ");' represent in the program?

    <p>A message prompting the user to input a double value</p> Signup and view all the answers

    What is the correct syntax for declaring a constant in Java?

    <p>final int CONSTANT_NAME = 10;</p> Signup and view all the answers

    Which naming convention should be used for class names in Java?

    <p>Capitalize the first letter of each word</p> Signup and view all the answers

    What is the preferred block style for braces in Java?

    <p>End-of-line style</p> Signup and view all the answers

    How do you get input from input dialog boxes in Java?

    <p>Using JOptionPane class</p> Signup and view all the answers

    What should you do to obtain a number from the input dialog box in Java?

    <p>Use parseInt() method</p> Signup and view all the answers

    Which data type is used for constants in Java?

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

    What is the correct syntax for declaring a variable in Java?

    <p>int variableName = 10;</p> Signup and view all the answers

    Which operator is used for shortcut assignment in Java?

    <p>+=</p> Signup and view all the answers

    What is the correct naming convention for variables and method names in Java?

    <p>Capitalize the first letter of each word</p> Signup and view all the answers

    How would you convert a string into a number in Java?

    <p>.parseInt() method</p> Signup and view all the answers

    In Java, what is the purpose of the 'import java.util.Scanner;' statement in the program?

    <p>To include the Scanner class from the java.util package</p> Signup and view all the answers

    What is the purpose of the 'System.out.print("Enter a number for radius: ");' statement in the program?

    <p>To prompt the user to enter a number for the radius</p> Signup and view all the answers

    Which keyword is used for declaring a constant variable in Java?

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

    What type of input does the 'input.nextDouble();' method expect in the Java program?

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

    Which Java keyword is used to define a reusable block of code that can be called with different arguments?

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

    What is the general purpose of the 'ComputeAreaWithConsoleInput' class in the Java program?

    <p>To calculate and display the area of a circle based on user input</p> Signup and view all the answers

    Which naming convention should be used for variables and method names in Java?

    <p>Lowercase for the first word and capitalize the first letter of each subsequent word</p> Signup and view all the answers

    What is the correct syntax for declaring a constant in Java?

    <p>final datatype CONSTANTNAME = VALUE;</p> Signup and view all the answers

    What block style should be used for braces in Java?

    <p>End-of-line style</p> Signup and view all the answers

    What is the purpose of 'import javax.swing.JOptionPane;' in the program?

    <p>To import package for GUI components and input dialog boxes</p> Signup and view all the answers

    What is used to obtain the input as a number from a string in Java?

    <p>'Integer.parseInt' method</p> Signup and view all the answers

    What is the correct naming convention for class names in Java?

    <p>Capitalize the first letter of each word in the name</p> Signup and view all the answers

    Which operator is used for shortcut assignment in Java?

    <p>+=</p> Signup and view all the answers

    What is used to approximate pi in Java?

    <p>3.14159</p> Signup and view all the answers

    'println' is a method belonging to which class in Java?

    <p>'PrintStream' class</p> Signup and view all the answers

    'JOptionPane.showInputDialog' is used to get input from which type of dialog box in Java?

    <p>'QUESTION_MESSAGE' dialog box</p> Signup and view all the answers

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