The names of two instance variables: question, answer
The names of three methods: Riddle(), getQuestion(), getAnswer()
Solution 2.3
For RiddleUser class (Fig. 2.15),
The names of two Riddle instances: riddle1, riddle2
All six method calls of the Riddle objects in the program:
Riddle("What is black and white and red all over?", "An embarrassed zebra.") Riddle("What is black and white and read all over?", "A newspaper.") riddle1.getQuestion() riddle1.getAnswer() riddle2.getQuestion() riddle2.getAnswer()
Qualified names: riddle1.getQuestion() and riddle1.getAnswer()
Solution 2.4
Definition of new instance variable in the Riddle class:
private String hint = "This riddle is too easy for a hint";
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Solution 2.5
The header for a getHint() method of the Riddle class, which should be a public method, is:
public String getHint();
Solution 2.6
The header for a setHint() method of the Riddle class is:
public void setHint(String aHint);
The result type is void. Although the identifier used for the parameter is arbitrary, it is a good practice to make it descriptive by referring in some way to the hint instance variable.
Solution 2.7
The partial definition of the Student class is given below.
public class Student { private String firstName; private String lastName; private int studentID; public void setStudent(String fName, String lName, int anID); public int getStudentID(); public String getStudentName(); }
Solution 2.8
A main method that reads and squares a real number is given below.
public static void main(String[] args) { // Create Scanner object Scanner sc = Scanner.create(System.in); System.out.print("Input a real number:"); // Promptdouble realNum= sc.nextDouble(); // Read a double System.out.println(num + " squared = " + realNum*realNum); } // main()
