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?
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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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