SH1679 Classes, Objects and Methods (Part 1) I.Class Method Definitions

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Questions and Answers

What are the two main access modifiers in Java, and how do they differ in their restrictions?

The two main access modifiers in Java are public and private. Public modifiers have no restrictions on where their corresponding program entities can be used, while private modifiers restrict use of their accompanying program entities within their own class method definition.

What is the purpose of an accessor method in Java?

An accessor method, also called a get method or getter, is a public method that returns data from a private instance variable, allowing access to private data.

What is the purpose of a mutator method in Java?

A mutator method, also called a set method or setter, is a public method that changes data stored in one or more private instance variables, allowing modification of private data.

What is the process of encapsulation in Java, and how does it relate to the use of access modifiers?

<p>Encapsulation is the process of combining data and actions into a single item, grouping instance variables and methods into a class and hiding implementation details. Access modifiers like public and private are a key part of encapsulation, restricting access to certain class members.</p> Signup and view all the answers

Explain the difference between a getter method and a setter method in Java.

<p>A getter method is a public method that returns the value of a private instance variable, while a setter method is a public method that changes the value of one or more private instance variables.</p> Signup and view all the answers

How do access modifiers like public and private help to implement the principle of information hiding in object-oriented programming?

<p>Access modifiers like <code>public</code> and <code>private</code> allow programmers to hide the implementation details of a class by restricting access to certain class members. This supports the principle of information hiding, where the internal workings of an object are concealed from the outside world.</p> Signup and view all the answers

What are instance variables?

<p>Variables declared outside any method, constructor or code block within a class.</p> Signup and view all the answers

Define methods in the context of programming.

<p>Collections of statements grouped together to perform an operation.</p> Signup and view all the answers

Explain the types of methods mentioned in the text.

<ol> <li>Methods that return a single value or object to derive data. 2. Methods that perform actions like setting variable values.</li> </ol> Signup and view all the answers

What is the significance of the 'this' keyword in Java?

<p>Used to pertain to the name of an object receiving a method call within a method definition.</p> Signup and view all the answers

Explain local variables in Java.

<p>Variables declared within a method definition and are only visible to that method.</p> Signup and view all the answers

What is Information Hiding in programming?

<p>A mechanism that restricts access to some of the object's components.</p> Signup and view all the answers

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