Podcast
Questions and Answers
What does the access modifier 'protected' imply about method visibility?
What does the access modifier 'protected' imply about method visibility?
- It can only be accessed within its own package and by subclasses. (correct)
- It is accessible by all classes regardless of package.
- It is only accessible within the class that defines it.
- It allows access to only subclasses in the same package.
Which optional specifier indicates that a method cannot be overridden by a subclass?
Which optional specifier indicates that a method cannot be overridden by a subclass?
- final (correct)
- public
- static
- abstract
What is indicated by a method's return type being declared as 'void'?
What is indicated by a method's return type being declared as 'void'?
- The method does not return any value. (correct)
- The method can return an object.
- The method may throw an exception.
- The method returns an integer value.
Which of the following is true about the 'package-private' access modifier?
Which of the following is true about the 'package-private' access modifier?
What must be included when calling the nap() method?
What must be included when calling the nap() method?
Which access modifier allows a method to be available to all classes and packages?
Which access modifier allows a method to be available to all classes and packages?
Which of the following is NOT a common optional specifier for methods in Java?
Which of the following is NOT a common optional specifier for methods in Java?
What can the 'static' specifier indicate about a method?
What can the 'static' specifier indicate about a method?
What should a method name always start with?
What should a method name always start with?
Which of the following is a correct example of a method declaration?
Which of the following is a correct example of a method declaration?
What is the purpose of the optional exception list in a method declaration?
What is the purpose of the optional exception list in a method declaration?
Which of the following is NOT a part of a method declaration?
Which of the following is NOT a part of a method declaration?
What is the purpose of the method body in a method declaration?
What is the purpose of the method body in a method declaration?
Study Notes
Method Declaration
- A method declaration provides necessary information to call a method, including its name, return type, parameters, and body.
- Naming convention: method names should be a verb in lowercase (e.g.,
run), or a multi-word name starting with a lowercase verb (e.g.,runFast). - Example method declaration:
public final void nap(int minutes) throws Exception { //statements }
Components of a Method Declaration
- Access Modifier: Defines visibility.
public,private,protected, and package-private (default with no modifier). - Optional Specifier: Can include keywords like
final(prevents method overriding) andstatic(indicates a class method). - Return Type: Indicates the data type of the return value. Use
voidif no return value is present. - Method Name: The identifier for the method (e.g.,
nap), mandatory. - Parameter List: A comma-separated list of input parameters with data types, enclosed in parentheses. Can be empty if no parameters exist.
- Optional Exception List: Indicates the exceptions that may be thrown by the method (e.g.,
throws Exception), optional. - Method Body: Enclosed in braces
{}, contains the executable code and local variable declarations. Can be empty if no code is necessary.
Access Modifiers
- Public: Accessible by any class.
- Private: Accessible only within its own class.
- Protected: Accessible within its own package and by subclasses in other packages.
- Package-private: Accessible only within its own package (default when no modifier is specified).
Optional Specifiers
- Static: Defines a method that belongs to the class rather than any instance.
- Abstract: Used when a method does not have an implementation (must be overridden in subclasses).
- Final: Ensures a method cannot be overridden by subclasses.
Method Usage
- To call a method, type the method name followed by an argument in parentheses (e.g.,
nap(15);).
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Description
Explore the essential guidelines for naming methods in programming as outlined in IT1908. This quiz focuses on the proper declaration of methods, including the use of verbs and naming conventions. Test your understanding of creating effective and compliant method names.
