What this deck covers
This deck focuses on Class Variables And Methods, 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: Class Variables And Methods
Study Class Variables And Methods 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
Class Variables And Methods
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QUESTION
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What is the main disadvantage of using class variables extensively?
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ANSWER
Increased coupling. Global state creates dependencies between classes.
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Flashcard 1: What is the main disadvantage of using class variables extensively?
Answer: Increased coupling. Global state creates dependencies between classes.
Flashcard 2: State whether class methods can be abstract.
Answer: No. Abstract requires inheritance; static methods cannot be overridden.
Flashcard 3: What is the primary use of static import?
Answer: Access static members without class name. Allows direct access to static members without qualification.
Flashcard 4: Can a static method be final?
Answer: Yes. Final prevents method from being overridden.
Flashcard 5: Can class methods be overloaded in Java?
Answer: Yes. Multiple methods with same name but different parameters.
Flashcard 6: Which keyword is used to synchronize a class method?
Answer: synchronized. Synchronized ensures thread-safe access to the method.
Flashcard 7: What is the default value of a class variable of type boolean?
Answer: false. Boolean primitive type defaults to false.
Flashcard 8: Which keyword should be used to ensure a class variable cannot be changed?
Answer: final. Final prevents reassignment after initialization.
Flashcard 9: Identify the error: modifying a final class variable.
Answer: Final variables cannot be reassigned. Final variables are constants after initialization.
Flashcard 10: Can class methods access instance variables directly?
Answer: No. Static context cannot access non-static members directly.
Flashcard 11: Which keyword is used to synchronize a class method?
Answer: synchronized. Synchronized ensures thread-safe access to the method.
Flashcard 12: Can a static method be final?
Answer: Yes. Final prevents method from being overridden.
Flashcard 13: What is the result of calling a non-static method from a static context?
Answer: Compilation error. Static context cannot access non-static members.
Flashcard 14: Can a static method call another static method in the same class?
Answer: Yes. Static methods can call other static members directly.
Flashcard 15: In which memory area are class variables stored?
Answer: Method Area. Static variables are stored in the method area of memory.
Flashcard 16: Identify the error: modifying a final class variable.
Answer: Final variables cannot be reassigned. Final variables are constants after initialization.
Flashcard 17: What is the main purpose of a static block?
Answer: Initialize static variables. Static blocks run once when class is first loaded.
Flashcard 18: Identify the error: static method trying to override an instance method.
Answer: Static methods cannot override instance methods. Static methods cannot participate in polymorphism.
Flashcard 19: What is the primary characteristic of a static nested class?
Answer: Does not require an instance of the outer class. Static nested classes don't need outer class instances.
Flashcard 20: State the keyword used to prevent inheritance of a class method.
Answer: final. Final prevents method from being overridden in subclasses.
Flashcard 21: Find the error: accessing instance variable from a static method.
Answer: Static methods cannot access instance variables directly. Static methods need object reference for instance variables.
Flashcard 22: What is the primary advantage of using class variables?
Answer: Shared data among all instances. One copy exists for all objects of the class.
Flashcard 23: Determine if a class method can be called using an instance.
Answer: Yes, but not recommended. Compiler allows but style guides discourage this practice.
Flashcard 24: State the default value of a class variable of type double.
Answer: 0.0. Floating-point primitive types default to 0.0.
Flashcard 25: What is the result of accessing a static variable with an instance?
Answer: Valid but discouraged. Works but using class name is clearer style.
Flashcard 26: Can a static method call another static method in the same class?
Answer: Yes. Static methods can call other static members directly.
Flashcard 27: Can class methods be overridden in subclasses?
Answer: No. Static methods belong to class, cannot be overridden.
Flashcard 28: Identify the keyword used to declare a class method.
Answer: static. Makes the method belong to the class, not instances.
Flashcard 29: What is the default value of a class variable of type int?
Answer:
Flashcard 30: Which keyword should be used to ensure a class variable cannot be changed?
Answer: final. Final prevents reassignment after initialization.
Flashcard 31: Choose the correct way to call a class method 'compute' from class 'MathUtils'.
Answer: MathUtils.compute(). Use ClassName.methodName() syntax for static methods.
Flashcard 32: Find the error: accessing instance variable from a static method.
Answer: Static methods cannot access instance variables directly. Static methods need object reference for instance variables.
Flashcard 33: State whether class methods can be abstract.
Answer: No. Abstract requires inheritance; static methods cannot be overridden.
Flashcard 34: What is a class variable in Java?
Answer: A variable declared with the static keyword, shared by all instances. Belongs to the class itself, not individual objects.
Flashcard 35: Identify the error: static method trying to override an instance method.
Answer: Static methods cannot override instance methods. Static methods cannot participate in polymorphism.
Flashcard 36: What is the primary advantage of using class variables?
Answer: Shared data among all instances. One copy exists for all objects of the class.
Flashcard 37: What is the main purpose of a static block?
Answer: Initialize static variables. Static blocks run once when class is first loaded.
Flashcard 38: What is the scope of a class variable?
Answer: Entire class. Class variables exist at the class level globally.
Flashcard 39: Identify the order of execution for static blocks and class variables.
Answer: Static variables first, then static blocks. Static initialization follows declaration order in source code.
Flashcard 40: What is the primary characteristic of a static nested class?
Answer: Does not require an instance of the outer class. Static nested classes don't need outer class instances.
Flashcard 41: What is the visibility modifier for a class variable visible only within its package?
Answer: default. Default means package-private visibility.
Flashcard 42: What is a class method in Java?
Answer: A method declared with the static keyword, can be called without an instance. Belongs to the class, accessible without creating objects.
Flashcard 43: What is the scope of a class variable?
Answer: Entire class. Class variables exist at the class level globally.
Flashcard 44: Choose the correct way to call a class method 'compute' from class 'MathUtils'.
Answer: MathUtils.compute(). Use ClassName.methodName() syntax for static methods.
Flashcard 45: Identify the keyword used to declare a class variable.
Answer: static. Makes the variable belong to the class, not instances.
Flashcard 46: What is the effect of declaring a method as static?
Answer: Belongs to the class, not instances. Static members are associated with the class itself.
Flashcard 47: What happens if a class variable is not initialized?
Answer: Default value is assigned. Java automatically assigns default values to static variables.
Flashcard 48: Determine if class methods can access static variables.
Answer: Yes. Static methods can access other static members.
Flashcard 49: Identify the visibility modifier for a class variable accessible to all classes.
Answer: public. Public modifier allows access from any class.
Flashcard 50: Determine if a class method can be called using an instance.
Answer: Yes, but not recommended. Compiler allows but style guides discourage this practice.
Flashcard 51: Identify the order of execution for static blocks and class variables.
Answer: Static variables first, then static blocks. Static initialization follows declaration order in source code.
Flashcard 52: What is the default value of a class variable of type int?
Answer:
Flashcard 53: Can a class variable be private?
Answer: Yes. Private restricts access to the declaring class only.
Flashcard 54: Can class methods be overridden in subclasses?
Answer: No. Static methods belong to class, cannot be overridden.
Flashcard 55: What is the main disadvantage of using class variables extensively?
Answer: Increased coupling. Global state creates dependencies between classes.
Flashcard 56: Determine the visibility of a class method declared with no modifier.
Answer: Package-private. No access modifier means package-private visibility.
Flashcard 57: What happens if a class variable is not initialized?
Answer: Default value is assigned. Java automatically assigns default values to static variables.
Flashcard 58: What is a class method in Java?
Answer: A method declared with the static keyword, can be called without an instance. Belongs to the class, accessible without creating objects.
Flashcard 59: What is the default value of a class variable of type boolean?
Answer: false. Boolean primitive type defaults to false.
Flashcard 60: Determine the visibility of a class method declared with no modifier.
Answer: Package-private. No access modifier means package-private visibility.
Flashcard 61: Identify the keyword used to declare a class variable.
Answer: static. Makes the variable belong to the class, not instances.
Flashcard 62: State the default value of a class variable of type double.
Answer: 0.0. Floating-point primitive types default to 0.0.
Flashcard 63: Identify the visibility modifier for a class variable accessible to all classes.
Answer: public. Public modifier allows access from any class.
Flashcard 64: Determine if class methods can access static variables.
Answer: Yes. Static methods can access other static members.
Flashcard 65: What is the result of accessing a static variable with an instance?
Answer: Valid but discouraged. Works but using class name is clearer style.
Flashcard 66: What is the visibility modifier for a class variable visible only within its package?
Answer: default. Default means package-private visibility.
Flashcard 67: In which memory area are class variables stored?
Answer: Method Area. Static variables are stored in the method area of memory.
Flashcard 68: State the keyword used to prevent inheritance of a class method.
Answer: final. Final prevents method from being overridden in subclasses.
Flashcard 69: What is the primary use of static import?
Answer: Access static members without class name. Allows direct access to static members without qualification.