What this deck covers
This deck focuses on Anatomy Of A Class, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science a.
AP Computer Science a Flashcards: Anatomy Of A Class
Study Anatomy Of A Class in AP Computer Science a with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science a
Anatomy Of A Class
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QUESTION
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What is the signature of a method?
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ANSWER
The method's name and parameter list. Identifies method for compilation and overriding.
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Flashcard 1: What is the signature of a method?
Answer: The method's name and parameter list. Identifies method for compilation and overriding.
Flashcard 2: What is the purpose of a constructor?
Answer: To initialize a new object of a class. Sets initial values for object fields.
Flashcard 3: What is method overriding?
Answer: Redefining a method in a subclass that exists in the superclass. Child class replaces parent's method implementation.
Flashcard 4: What is a method in a Java class?
Answer: A block of code that performs a specific task. Defines behavior that objects can perform.
Flashcard 5: What is encapsulation in Java?
Answer: Hiding data fields using access modifiers. Core OOP principle for data protection.
Flashcard 6: Identify the superclass of all classes in Java.
Answer: Object. Root class that all Java classes inherit from.
Flashcard 7: What is the main purpose of a Java interface?
Answer: To specify methods that a class must implement. Enforces method contracts without implementation.
Flashcard 8: What is an abstract class?
Answer: A class that cannot be instantiated and may contain abstract methods. Serves as template requiring subclass implementation.
Flashcard 9: What is the signature of a method?
Answer: The method's name and parameter list. Identifies method for compilation and overriding.
Flashcard 10: What is the static keyword used for?
Answer: To define class-level fields and methods. Belongs to class rather than instances.
Flashcard 11: Which access modifier restricts visibility to the containing class?
Answer: private. Most restrictive access level for data hiding.
Flashcard 12: What is a class in Java?
Answer: A blueprint for creating objects, defining fields and methods. Encapsulates data and behavior for object creation.
Flashcard 13: What is the purpose of a constructor?
Answer: To initialize a new object of a class. Sets initial values for object fields.
Flashcard 14: What is method overloading?
Answer: Defining multiple methods with the same name but different parameters. Same name, different parameter signatures.
Flashcard 15: What is an abstract class?
Answer: A class that cannot be instantiated and may contain abstract methods. Serves as template requiring subclass implementation.
Flashcard 16: Which access modifier allows visibility to all classes?
Answer: public. Provides unrestricted access from anywhere.
Flashcard 17: Identify the method that returns a string representation of an object.
Answer: toString(). Provides readable format for object display.
Flashcard 18: Identify the method that initializes an object.
Answer: Constructor. Special method that sets up new object instances.
Flashcard 19: Which keyword prevents a class from being subclassed?
Answer: final. Prevents inheritance to maintain class integrity.
Flashcard 20: Identify the superclass of all classes in Java.
Answer: Object. Root class that all Java classes inherit from.
Flashcard 21: Identify the keyword used to import a package.
Answer: import. Makes external classes available in current file.
Flashcard 22: Which keyword is used to implement an interface?
Answer: implements. Establishes contract between class and interface.
Flashcard 23: What is the purpose of the 'this' keyword?
Answer: Refers to the current instance of a class. Distinguishes between instance and parameter variables.
Flashcard 24: What is a field in a Java class?
Answer: A variable declared within a class. Stores data as part of an object's state.
Flashcard 25: What is the difference between == and equals()?
Answer: == checks reference; equals() checks value equality. Reference vs content comparison distinction.
Flashcard 26: Which keyword is used to declare an abstract class?
Answer: abstract. Prevents direct instantiation of the class.
Flashcard 27: What is the difference between == and equals()?
Answer: == checks reference; equals() checks value equality. Reference vs content comparison distinction.
Flashcard 28: What keyword is used to inherit from a class?
Answer: extends. Creates parent-child relationship between classes.
Flashcard 29: What is the purpose of the 'this' keyword?
Answer: Refers to the current instance of a class. Distinguishes between instance and parameter variables.
Flashcard 30: What is polymorphism in Java?
Answer: The ability to process objects differently based on their data type. Enables one interface with multiple implementations.
Flashcard 31: Identify the method that is automatically called when an object is created.
Answer: Constructor. Invoked immediately upon object instantiation.
Flashcard 32: What is encapsulation in Java?
Answer: Hiding data fields using access modifiers. Core OOP principle for data protection.
Flashcard 33: Identify the keyword to declare a constant in Java.
Answer: final. Makes fields or variables unchangeable after initialization.
Flashcard 34: What is inheritance in Java?
Answer: A mechanism where one class acquires the properties of another. Child class gains parent's properties and methods.
Flashcard 35: Identify the keyword used to import a package.
Answer: import. Makes external classes available in current file.
Flashcard 36: Which keyword is used to create an object in Java?
Answer: new. Allocates memory and invokes the constructor.
Flashcard 37: Which access modifier restricts visibility to the containing class?
Answer: private. Most restrictive access level for data hiding.
Flashcard 38: What is a field in a Java class?
Answer: A variable declared within a class. Stores data as part of an object's state.
Flashcard 39: Which access modifier allows visibility within the same package only?
Answer: default (no modifier). Package-private access when no modifier specified.
Flashcard 40: What is an object in the context of Java?
Answer: An instance of a class containing fields and methods. A concrete realization of a class template.
Flashcard 41: What is method overloading?
Answer: Defining multiple methods with the same name but different parameters. Same name, different parameter signatures.
Flashcard 42: Which method is used to compare two objects for equality?
Answer: equals(). Compares object content rather than references.
Flashcard 43: Which access modifier allows visibility within the same package only?
Answer: default (no modifier). Package-private access when no modifier specified.
Flashcard 44: What is a package in Java?
Answer: A namespace that organizes classes and interfaces. Groups related classes for organization.
Flashcard 45: What is the static keyword used for?
Answer: To define class-level fields and methods. Belongs to class rather than instances.
Flashcard 46: Which keyword is used to create an object in Java?
Answer: new. Allocates memory and invokes the constructor.
Flashcard 47: Identify the default value of an int field in Java.
Answer:
Flashcard 48: What is a package in Java?
Answer: A namespace that organizes classes and interfaces. Groups related classes for organization.
Flashcard 49: Can a Java class implement multiple interfaces?
Answer: Yes, a class can implement multiple interfaces. Multiple inheritance through interfaces is allowed.
Flashcard 50: Which keyword is used to invoke a superclass's constructor?
Answer: super. Calls parent constructor or method explicitly.
Flashcard 51: What does the keyword 'super' refer to in Java?
Answer: The superclass of the current object. Accesses parent class members and methods.
Flashcard 52: Identify the keyword used to declare a class in Java.
Answer: class. The reserved word that starts all class definitions.
Flashcard 53: What is method overriding?
Answer: Redefining a method in a subclass that exists in the superclass. Child class replaces parent's method implementation.
Flashcard 54: What is the default value of a boolean field in Java?
Answer: false. Primitive types initialize to false automatically.
Flashcard 55: What is a class in Java?
Answer: A blueprint for creating objects, defining fields and methods. Encapsulates data and behavior for object creation.
Flashcard 56: Identify the method that initializes an object.
Answer: Constructor. Special method that sets up new object instances.
Flashcard 57: What is a method in a Java class?
Answer: A block of code that performs a specific task. Defines behavior that objects can perform.
Flashcard 58: Identify the keyword used to declare a class in Java.
Answer: class. The reserved word that starts all class definitions.
Flashcard 59: Which keyword is used to invoke a superclass's constructor?
Answer: super. Calls parent constructor or method explicitly.
Flashcard 60: Can a Java class implement multiple interfaces?
Answer: Yes, a class can implement multiple interfaces. Multiple inheritance through interfaces is allowed.
Flashcard 61: What is the default value of a boolean field in Java?
Answer: false. Primitive types initialize to false automatically.
Flashcard 62: What is polymorphism in Java?
Answer: The ability to process objects differently based on their data type. Enables one interface with multiple implementations.
Flashcard 63: What keyword is used to inherit from a class?
Answer: extends. Creates parent-child relationship between classes.
Flashcard 64: Identify the method that returns a string representation of an object.
Answer: toString(). Provides readable format for object display.
Flashcard 65: Which access modifier allows visibility to all classes?
Answer: public. Provides unrestricted access from anywhere.
Flashcard 66: Identify the method that is automatically called when an object is created.
Answer: Constructor. Invoked immediately upon object instantiation.
Flashcard 67: What is an object in the context of Java?
Answer: An instance of a class containing fields and methods. A concrete realization of a class template.