Podcast
Questions and Answers
What is the first step in object-oriented programming before declaring a class?
What is the first step in object-oriented programming before declaring a class?
- Implementing behaviors.
- Declaring attributes.
- Planning attributes and methods. (correct)
- Defining methods.
Which of the following best describes an attribute in the context of class declaration?
Which of the following best describes an attribute in the context of class declaration?
- A type of class declaration.
- A characteristic of the class. (correct)
- A process performed by the class.
- An action that modifies the class.
In a 'Student Information System', which of the following is most likely to be a method of the 'Student' class?
In a 'Student Information System', which of the following is most likely to be a method of the 'Student' class?
- Name
- Course
- Enroll() (correct)
- Year
What is a critical naming convention for Java classes?
What is a critical naming convention for Java classes?
What immediately follows the class keyword in any class declaration?
What immediately follows the class keyword in any class declaration?
Which of the following statements is true regarding naming conventions in Java?
Which of the following statements is true regarding naming conventions in Java?
What is the term used to describe the attributes of a class that are implemented?
What is the term used to describe the attributes of a class that are implemented?
Where are instance variables declared within a class?
Where are instance variables declared within a class?
What is the fundamental element you must follow to declare a method in Java?
What is the fundamental element you must follow to declare a method in Java?
What are lines 10 and 16 called in the code snippet provided?
What are lines 10 and 16 called in the code snippet provided?
What symbols delimit every method body?
What symbols delimit every method body?
What happens in a method body when a local variable has the same name as an instance variable?
What happens in a method body when a local variable has the same name as an instance variable?
How can a method body explicitly refer to an instance variable when a local variable has the same name?
How can a method body explicitly refer to an instance variable when a local variable has the same name?
Which of the following is typically considered a best practice for naming methods and attributes?
Which of the following is typically considered a best practice for naming methods and attributes?
Consider an analogy where a 'Car' is a class. Which of the following would most appropriately be an attribute of the 'Car' class?
Consider an analogy where a 'Car' is a class. Which of the following would most appropriately be an attribute of the 'Car' class?
In the context of class declaration, which of the following is an example of a method?
In the context of class declaration, which of the following is an example of a method?
Which of the following is an appropriate syntax for declaring an instance variable?
Which of the following is an appropriate syntax for declaring an instance variable?
Which statement accurately describes the relationship between attributes and instance variables?
Which statement accurately describes the relationship between attributes and instance variables?
If you want to ensure that a method's body uses an instance variable instead of a local variable with the same name, what should you do?
If you want to ensure that a method's body uses an instance variable instead of a local variable with the same name, what should you do?
In the context of a Java class, what does the term 'method declaration' refer to?
In the context of a Java class, what does the term 'method declaration' refer to?
Flashcards
What are attributes?
What are attributes?
Characteristics of the class.
What are methods?
What are methods?
Behaviors or processes performed by the class.
What are instance variables?
What are instance variables?
Variables that hold the attributes of a class; each object has its own copy.
What are Access Modifiers?
What are Access Modifiers?
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What is camelCase?
What is camelCase?
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Study Notes
- The text covers defining classes and methods in Java.
Class Declaration
- Object-oriented programming necessitates knowing how to declare a class first.
- Defining classes requires initially planning its attributes and methods.
- Attributes are the characteristics of the class.
- Methods are the behaviors or processes that the class performs.
- In the class
Animals, example attributes arescientific_nameandname. - Example methods for the
Animalsareeat(),run(), andbreed(). - When building a Student Information System, planning the necessary classes is essential.
- A
Studentclass might have attributes likename,Course, andyear. - Methods for the
Studentclass could includeenroll()anddrop(). - Class declaration begins at line 5.
- The syntax for a class declaration is
access_modifiers class class_name {}. - All Java classes must begin with a capital letter with a
.javafile extension. - All class declarations have the
classkeyword followed by the class's name. - Classes, methods, and attributes must adhere to the identifier scheme.
- Conventionally, class names start with an uppercase letter, while methods and attributes begin with a lowercase letter.
- The
camelCaseorsnake_casenaming scheme can be used for methods and attributes, withcamelCaserecommended for class names.
Instance Variables/Attributes
- A class possesses attributes, which are implemented as instance variables.
- Each object gets its own copy of class's instance variables.
- A class will often have one or more methods to manipulate its attributes.
- Instance variables are declared inside a class but outside of its methods.
- Instance variable syntax:
access_modifiers data_type/class identifiers/variable_name.
Methods
- Declaring a method in Java necessitates adherence to a specific syntax:
access_modifiers return_type method_name(data_type parameters) {}. - Method declaration refers to lines 10 and 16.
- Every method body is enclosed by curly braces
{}. - If a local variable shares a name with an instance variable, the method prioritizes the local variable.
- The keyword
thisexplicitly refers to the instance variable in a method's body.
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