Questions and Answers
What defines a new abstract data type?
What is an instance of a class data type?
Object
Object-oriented programming is designing a program by discovering objects, their properties, and their ______.
relationships
What holds the data for objects?
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What are the code behaviors or actions that an object can perform?
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What initializes the instance variables when the object is created?
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What is the method that is first called when a Java application executes?
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What are other names for instance variables?
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Private means that only the code in this class can directly access the instance variable values.
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What is the term for the data and code acting on the data being wrapped together into a single unit?
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Public means that variables can only be accessed from inside the class.
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What is another term for a getter method in Java?
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What are setters or modifiers in Java commonly referred to as?
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Void is a return type used to indicate that the method does return something.
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Study Notes
Java Class Anatomy
- A class serves as a blueprint to define a new abstract data type, encapsulating data and methods.
- An object is an instance of a class, representing an actual entity created based on the class definition.
- Object-oriented programming (OOP) emphasizes design through identifying objects, their attributes, and relationships, promoting code reusability and modularity.
- Instance variables are attributes specific to an object, used to hold its data.
- Methods define actions or behaviors that objects can perform, encapsulating functionality within the class.
- Constructors are special methods invoked when an object is created, responsible for initializing instance variables.
- The main method is the entry point of a Java application, where execution begins.
- Attributes, fields, or properties are alternative terms for instance variables in a class.
- The private access modifier restricts direct access to instance variables, ensuring data encapsulation and security within the class.
- Data encapsulation combines data (instance variables) and methods, hiding implementation details and exposing only necessary interfaces.
- The public access modifier allows methods and variables to be accessed from outside the class, facilitating interaction with the object.
- An accessor method, often referred to as a getter, provides read access to private instance variables.
- A mutator method, also known as a setter, modifies the value of instance variables, controlling how data is updated.
- The term void indicates that a method does not return a value, simplifying the method’s structure.
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Description
Test your knowledge on Java class anatomy and the basics of object-oriented programming. This quiz covers concepts such as classes, objects, instance variables, methods, and constructors. Perfect for students aiming to understand Java's foundational principles.