• III only

• II and III only

• I only

• II only

• Consider the following class definitions.

public class Publication {

private String author;

public Publication() {

this.author = "anonymous";

}

public Publication(String author) {

this.author = author;

}

}

public class Book extends Publication {

private int edition;

//Constructor(s) to be added here

}

Which of the following constructors can be added to the definition of class Book without causing compilation to fail?

• public Book(String author) {

• this.author = author;

• }

• public Book(String author, int edition) {

• this.edition = edition;

• super(author);

• }

• public Book(int edition) {

• super();

• this.edition = edition;

• }

• I and III only

• I and II only

• II only

• III only

• Which of the following statements about Java is (are) true?

• One class can define two methods with the same signature.

• If class B extends class A and overrides method m, then the argument names in the definition of method m in class B must be identical to those in class A.

• I only

• II only

• I and II

• None

• Which of the following statements about Java constructors is (are) true?

• The signature of a constructor can include a return type.

• The name of a constructor for a class can differ from the name of the class.

• A constructor can be invoked using the dot notation.

• I only

• II and III only

• I and III only

• None

• Which of the following statements about static attributes in Java is (are) true?

• Static attributes can be accessed by non-static methods in the same class.

• A static attribute can be accessed even if no instance of the class in which the attribute is defined exists.

• Static attributes can only be accessed by static methods.

• I only

• II only

• I, II, and III

• I and II only

• Consider the following Java class definitions.

public class Publication {

private String author;

public Publication() {

this.author = "anonymous";

}

public String getAuthor() {

return author;

}

}

public class Book extends Publication {

private int edition;

//No default constructor

public Book(int edition) {

this.edition = edition;

}

}

Based on these class definitions, which of the following program segments will compile?

• Book book = new Book(2);

• System.out.println(book.author);

• Book book = new Book(2);

• System.out.println(book.getAuthor());

• Book book = new Book();

• III only

• I only

• I and II only

• II only

• Which of the following statements about Java constructors is (are) true for any given class?

• Constructors can be overloaded.

• If a constructor is not defined, then one will be automatically created.

• One constructor can invoke another constructor using the keyword this.