Core Java programming concepts including classes, arrays, and control flow, tested on AP Computer Science A.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What is a class in Java?
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A blueprint or template for creating objects with shared properties and methods- Define an object.
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An instance of a class that has state (attributes) and behavior (methods)- What is encapsulation?
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Bundling data and methods together in a class while hiding internal implementation details- What is a constructor?
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A special method that initializes an object when it is created with the new keyword- What is inheritance?
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A mechanism where a subclass inherits properties and methods from a parent (superclass)- What is polymorphism?
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The ability of methods to behave differently depending on the object that calls them or the parameters passed- What is an array?
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An ordered collection of elements of the same data type stored in contiguous memory- What is a method?
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A block of code that performs a specific task and is defined within a class- Name the three access modifiers in Java.
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public (accessible everywhere), private (accessible only in the class), protected (accessible in subclasses and same package)- What is an instance variable?
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A variable declared within a class but outside all methods; each object has its own copy- What is a static variable?
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A class variable that is shared by all instances of a class, declared with the static keyword- What is a local variable?
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A variable declared and used only within a method or code block- What does the new keyword do?
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Creates a new instance of a class by allocating memory and calling the constructor- What is a reference variable?
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A variable that stores the memory address (reference) to an object, not the object itself- What does null represent?
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A special value indicating that a reference variable does not point to any object
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