5.2 Methods

• A method is a named block of code that performs a specific task
• The access modifier in a method header determines the visibility of the method
• The method name is a unique identifier for the method.


  True
• Methods promote reusability by allowing the same functionality to be used without duplication
• Abstraction in methods allows you to focus on what a method does rather than its implementation
• A return type of 'void' indicates that the method does not return any data
• The 'calculateArea' method calculates the area of a rectangle using its length and width.


  True
• The parameter list in a method header includes input values enclosed in parentheses
• A method with a return type of `void` does not return any data.


  True
• What are parameters in a method definition?

  Input values accepted
• Steps to calculate the area of a rectangle using a method:

  1️⃣ Define the method header with parameters (length, width)

  2️⃣ Specify the return type (int)

  3️⃣ Write the method body to multiply length and width

  4️⃣ Return the calculated area
• A method definition includes both a method header and a method body.

  True
• What is the modularity principle in method design?

  Breaks code into smaller units
• The access modifier of a method determines its visibility.

  True
• The parameter list in a method must be enclosed in parentheses.

  True
• Parameters are defined in the method header and enclosed in parentheses.

  True
• What is the return type of the method `calculateArea(int length, int width)`?

  int
• What keyword indicates a void method in Java?

  void
• What does method overloading allow in Java?

  Multiple methods with same name
• The `calculateArea` method returns the area
• Method overloading allows methods with the same name but different parameter lists within the same class.


  True
• What is the purpose of the two `add` methods in the `Calculator` class?

  Add integers
• Match the scope type with its description:

  Local Scope ↔️ Variables accessible within a method

  Instance Scope ↔️ Variables accessible throughout a class
• Instance variables have instance scope, while local variables have local scope.


  True
• Match the method header component with its description:

  Access Modifier ↔️ Determines method visibility

  Return Type ↔️ Indicates data type returned

  Method Name ↔️ Unique identifier for the method

  Parameter List ↔️ Input values the method accepts
• Arrange the purposes of methods in object-oriented programming:

  1️⃣ Encapsulation

  2️⃣ Reusability

  3️⃣ Modularity

  4️⃣ Abstraction
• Match the method syntax component with its example:

  Access Modifier ↔️ `public`

  Return Type ↔️ `int`, `String`, `void`

  Method Name ↔️ `calculateArea`, `getName`

  Parameter List ↔️ `(int length, int width)`
• What does the access modifier in a method header determine?

  Method visibility
• The input values a method accepts are called the parameter list.list
• What specifies the type of data a method returns?

  Return type
• What is the key difference between void and non-void methods in Java?

  Return a value
• Give an example of a non-void method.

  calculateArea
• Match the advantage of using methods with its description:

  Encapsulation ↔️ Groups related functionality

  Readability ↔️ Breaks down complex tasks

  Maintainability ↔️ Simplifies updates and debugging

  Reusability ↔️ Allows methods to be used across the class
• Method overloading improves code reusability by allowing the same method name for similar tasks.

  True
• Method overloading requires that methods with the same name have different parameter lists
• Variables declared at the class level have instance scope.
• A method should have only one purpose according to the Single Responsibility Principle.


  True
• What should methods use to receive required input data?

  Parameters
• Components of a method definition

  1️⃣ Method header

  2️⃣ Method body
• The method body contains the code that executes the task