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AP COMPUTER SCIENCE A UNIT 1 QUIZ GRADED A+

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AP COMPUTER SCIENCE A UNIT 1 QUIZ GRADED A+ What is a `class` in Java? A class in Java is a blueprint for creating objects. It defines the properties (attributes) and behaviors (methods) that the objects of that class will have. Explain the difference between a `primitive data type` a...

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Publié le 28 août 2024
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ap computer science a unit 1 quiz graded a

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AP COMPUTER SCIENCE A UNIT 1 QUIZ
GRADED A+

What is a `class` in Java?

✔✔ A class in Java is a blueprint for creating objects. It defines the properties (attributes) and

behaviors (methods) that the objects of that class will have.

Explain the difference between a `primitive data type` and a `reference data type`.

✔✔ A primitive data type holds simple values like integers, characters, and booleans. A

reference data type holds references to objects, such as arrays or instances of classes.

What is a `constructor` in Java?

✔✔ A constructor is a special method in a class that is called when an object of that class is

created. It is used to initialize the object's attributes.

What does the keyword `new` do in Java?

1

, ✔✔ The `new` keyword creates a new instance (object) of a class and allocates memory for it.

What is the difference between `instance variables` and `local variables`?

✔✔ Instance variables are declared in a class and are accessible by all methods in that class.

Local variables are declared inside a method and are only accessible within that method.

Explain what `method overloading` is in Java.

✔✔ Method overloading occurs when two or more methods in a class have the same name but

different parameters (different number or type of arguments).

What is the purpose of the `main()` method in a Java program?

✔✔ The `main()` method is the entry point of any Java program. It is where the program starts

execution.

What is the difference between `public` and `private` access modifiers?
2

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