AP Computer Science - Chapter 1 Quiz - Quiz, Flashcards & Trivia

1. A blueprint from which individual objects are created.

A class is a blueprint that defines the structure and behavior of objects. It specifies the attributes and methods that an object of that class will have. From this blueprint, individual objects can be created, each having its own unique set of attributes and behaviors. Therefore, a class can be seen as a template or a blueprint from which individual objects are created.

Explanation

A class is a blueprint that defines the structure and behavior of objects. It specifies the attributes and methods that an object of that class will have. From this blueprint, individual objects can be created, each having its own unique set of attributes and behaviors. Therefore, a class can be seen as a template or a blueprint from which individual objects are created.

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2. A(n) _____ represents individual instantiations of a class. (Two possible answers.)

An object represents an individual instantiation of a class. In object-oriented programming, a class is a blueprint for creating objects. An object is created from a class and has its own set of properties and behaviors. An instance, on the other hand, is another term used to refer to an object. Therefore, both "object" and "instance" can be used to describe individual instantiations of a class.

Explanation

An object represents an individual instantiation of a class. In object-oriented programming, a class is a blueprint for creating objects. An object is created from a class and has its own set of properties and behaviors. An instance, on the other hand, is another term used to refer to an object. Therefore, both "object" and "instance" can be used to describe individual instantiations of a class.

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3. Can an object have several different classes? Discuss.

An object can only have one direct class. For example, a desk at school is of class Table. This is its only class. However, class Table is part of class Furniture. Both Furniture and Table are classes of this desk, but Table is the only direct class.

Explanation

An object can only have one direct class. For example, a desk at school is of class Table. This is its only class. However, class Table is part of class Furniture. Both Furniture and Table are classes of this desk, but Table is the only direct class.

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4. Defines what kind of values a parameter can have.

The correct answer is "Type". This answer is appropriate because the type of a parameter determines the kind of values that can be assigned to it. The type specifies the data format or category that the parameter can accept, such as integers, strings, or booleans. By defining the type of a parameter, it helps to ensure that only valid values are passed as arguments and prevents any incompatible values from being used.

Explanation

The correct answer is "Type". This answer is appropriate because the type of a parameter determines the kind of values that can be assigned to it. The type specifies the data format or category that the parameter can accept, such as integers, strings, or booleans. By defining the type of a parameter, it helps to ensure that only valid values are passed as arguments and prevents any incompatible values from being used.

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5. Provides additional information for a task.

A parameter is a variable or value that is passed into a function or method as input. It provides additional information for a task by allowing the function to work with different values each time it is called. Parameters can be used to customize the behavior of a function and make it more flexible and reusable.

Explanation

A parameter is a variable or value that is passed into a function or method as input. It provides additional information for a task by allowing the function to work with different values each time it is called. Parameters can be used to customize the behavior of a function and make it more flexible and reusable.

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6. Determines the structure and behavior (the fields and methods) of each of the objects in that class.

The source code refers to the written instructions in a programming language that define the structure and behavior of each object in a class. It includes the fields (variables) and methods (functions) that determine the properties and actions of the objects. By writing the source code, programmers define how the objects will behave and interact with each other within the class.

Explanation

The source code refers to the written instructions in a programming language that define the structure and behavior of each object in a class. It includes the fields (variables) and methods (functions) that determine the properties and actions of the objects. By writing the source code, programmers define how the objects will behave and interact with each other within the class.

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7. Translates Java code into machine code.

A compiler is a software tool that translates Java code into machine code. It takes the high-level language code written by the programmer and converts it into a low-level language that can be understood and executed by the computer's hardware. This process involves several stages, such as lexical analysis, syntax analysis, and code generation. The resulting machine code can then be directly executed by the computer to perform the desired tasks specified in the Java code.

Explanation

A compiler is a software tool that translates Java code into machine code. It takes the high-level language code written by the programmer and converts it into a low-level language that can be understood and executed by the computer's hardware. This process involves several stages, such as lexical analysis, syntax analysis, and code generation. The resulting machine code can then be directly executed by the computer to perform the desired tasks specified in the Java code.

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8. What would you have to do to add a new field, for example one called name, to an object?

To create new fields, one must edit the source code of the class. In the source code, one needs to create a new variable (i.e., 'private String name;').

Explanation

To create new fields, one must edit the source code of the class. In the source code, one needs to create a new variable (i.e., 'private String name;').

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9. Write the signature for a method named send that has one parameter of type String, and does not return a value.

The correct answer is a valid signature for a method named "send" that takes a parameter of type String and does not return a value. It follows the standard syntax of a method signature in Java, where "public" indicates the access level, "void" specifies that the method does not return anything, "send" is the name of the method, and "(String txt)" defines the parameter type and name.

Explanation

The correct answer is a valid signature for a method named "send" that takes a parameter of type String and does not return a value. It follows the standard syntax of a method signature in Java, where "public" indicates the access level, "void" specifies that the method does not return anything, "send" is the name of the method, and "(String txt)" defines the parameter type and name.

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10. Write the signature for a method named average that has two parameters, both of type int, and returns an int value.

The signature for the method named average is correctly written as "public int average(int a, int b)". It follows the standard format for method signatures, with the keyword "public" indicating the access level, "int" specifying the return type, "average" being the method name, and "(int a, int b)" representing the two parameters of type int that the method accepts.

Explanation

The signature for the method named average is correctly written as "public int average(int a, int b)". It follows the standard format for method signatures, with the keyword "public" indicating the access level, "int" specifying the return type, "average" being the method name, and "(int a, int b)" representing the two parameters of type int that the method accepts.

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