Questions and Answers
The _________ of a class are also called the public services or the public interface that the class provides to its clients.
The static method ________ of class String returns a formatted String.
Which statement is false?
Which of the following should usually be private?
Signup and view all the answers
Which of the following statements is true?
Signup and view all the answers
When should a program explicitly use the this reference?
Signup and view all the answers
Having a this reference allows:
Signup and view all the answers
A constructor cannot:
Signup and view all the answers
Constructors:
Signup and view all the answers
A programmer-defined constructor that has no arguments is called a(n) ________.
Signup and view all the answers
What happens when this is used in a constructor's body to call another constructor of the same class if that call is not the first statement in the constructor?
Signup and view all the answers
When implementing a method, use the class's set and get methods to access the class's ________ data.
Signup and view all the answers
Which statement is false?
Signup and view all the answers
Set methods are also commonly called ________ methods and get methods are also commonly called ________ methods.
Signup and view all the answers
Study Notes
Class Interfaces and Public Methods
- Public methods of a class are its public interface, referred to as "public services."
- Instance variables should generally be kept private to encapsulate data and ensure integrity.
String Class and Static Methods
- The static method
formatin class String is used to return a formatted String.
Client-Implementation Interaction
- Client classes usually do not concern themselves with a class's internal data representation.
- Hiding implementation details helps prevent clients from depending on specific class implementations.
Access Control in Classes
- Variables (fields) should generally be private while methods can be public or private.
- Methods and instance variables may be set as public or private depending on access requirements.
Using "this" Reference
- The
thisreference is explicitly used to access fields that are shadowed by local variables. -
thisallows methods to refer to instance variables and other methods, with both explicit and implicit references possible.
Constructors in Classes
- Constructors cannot specify return types or return values but can be overloaded and used to initialize instance variables.
- A constructor without arguments is called a no-argument constructor.
Error Handling with Constructors
- If the call to
thiswithin a constructor is not the first statement, a compilation error will occur.
Accessing Private Data
- Set and get methods are employed to manage access to private data, ensuring data integrity.
Default Constructors
- The compiler does not always create a default constructor, particularly if a class requires arguments for all its constructors.
Accessor and Mutator Methods
- Set methods are often called mutator methods, while get methods are referred to as accessor methods, central to data encapsulation and integrity.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of Java concepts with these flashcards from Chapter 8. This quiz focuses on public methods, static methods, and the String class. Perfect for anyone looking to reinforce their understanding of Java programming.
