Java 1.1 to 2.1

Topic 1.1: Describe the use of main in a Java app

Imagine you're a wizard in the magical world of Java. What's the right spell to summon an instance of your own class in the main function?

• MyClass myObject = new MyClass();

• MyClass myObject = MyClass();

• myObject = MyClass.new;

• new myObject = MyClass();

Topic 1.1: Describe the use of main in a Java app

How can you pass command-line arguments when running a Java application?

• Separate them by commas

• Put them in square brackets

• Separate them by spaces

• Enclose them in double quotes

Topic 1.2: Perform basic input and output using standard packages

18. Which method of the Scanner class reads a whole line from standard input?

• readLine()
• nextLine()
• read()
• next()

Topic 1.2: Perform basic input and output using standard packages

Which import statement is necessary for using Scanner class?

• import java.util.Scanner;
• import java.util.Input;
• import java.util.Output;
• import java.util.IO;

Topic 1.3: Evaluate the scope of a variable

20. What will be the scope of a variable declared inside a for-loop?

• Class scope

• Instance scope

• Block scope
• Function scope

Topic 1.3: Evaluate the scope of a variable

What happens if you try to access a local int variable before it's initialized?

• A runtime error occurs

• The variable will be automatically initialized to the default value for an int, which is 0.

• A compilation error occurs

• None of the above

Topic 1.4: Comment and document programs

22. Which symbol marks the beginning of a Javadoc comment?

• /*
• /**
• //
• #

Topic 1.4: Comment and document programs

Which of the following are proper ways to use Javadoc to describe method parameters? (Select all that apply.)

• /** @param name the name of the user */

• /** @method name, age */

• /** @describe name is the user's name */

• /** @param name the user's name, @param age the user's age */

• /** @arg name represents the user name */

Topic 2.1: Declare and use primitive data type variables

24. Which of the following is a default value for an uninitialized char variable?

• '\u0000'
• '0'
• null
• undefined

The main method must have a specific signature to be the entry point of a Java application. The correct signature is ______________________________.