Java: Classes and Objects - Questions and Answers, Exams of Computer Science

A series of questions and answers related to java classes and objects. It covers fundamental concepts such as object properties, instance variables, methods, constructors, access modifiers, and object creation. Suitable for beginners learning java programming and can be used as a self-assessment tool or a study guide.

Typology: Exams

2024/2025

Available from 01/09/2025

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JAVA; CLASSES AND OBJECTS
QUESTIONS AND ANSWERS
Objects have two properties. One is state. What is the other? - ANSWER
Behavior
The state of an object is stored in _____ _____ - ANSWER Instance variables
The behaviour of an object is represented by ______ ______ - ANSWER
Instance methods
The job of a _____ is to initialise instance variables at the time an object is
created. - ANSWER Constructor
There are three kinds of declarations nested inside a class declaration. What are
they? - ANSWER Constructor declarations
Variable declarations
Method declarations
The words public and private are _____ _____ - ANSWER Access modifiers
A method is allowed to have _______, which represent data that will be
supplied when the method is called. - ANSWER Parameters
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JAVA; CLASSES AND OBJECTS

QUESTIONS AND ANSWERS

Objects have two properties. One is state. What is the other? - ANSWER Behavior The state of an object is stored in _____ _____ - ANSWER Instance variables The behaviour of an object is represented by ______ ______ - ANSWER Instance methods The job of a _____ is to initialise instance variables at the time an object is created. - ANSWER Constructor There are three kinds of declarations nested inside a class declaration. What are they? - ANSWER Constructor declarations Variable declarations Method declarations The words public and private are _____ _____ - ANSWER Access modifiers A method is allowed to have _______, which represent data that will be supplied when the method is called. - ANSWER Parameters

Once a class has been declared, we can create objects that belong to the class. We say these objects are ______ of the class. - ANSWER Instances An object variable doesn't actually store an object. Instead it stores a ______ to an object. - ANSWER Reference The keyword ______ is placed before a class name in order to create an object. - ANSWER new To operate on an object, we _______ one of the instance methods associated with the object. - ANSWER Call How do you call an instance method - ANSWER object.methodname(arguments) Reference variables are referred to as _______ variables in other programming languages. - ANSWER Pointer What value can we assign to an object variable to indicate that it doesn't currently store an object? - ANSWER null A new object that's been created by copying an existing object is said to be a _______. - ANSWER Clone An object that's no longer accessible through any object variable is said to be _______. - ANSWER Garbage