Thread: 2 Questions about Inheritance

Hi!

a quiz code is attached as a pdf file.

There are 2 questions I'm not shure.

1) Line ... is the first line of a mutator method that is inherited by the subclass.

Answer: 17 ?

2) Line ... is the first line of a method in the super class that is not inherited by the subclass.

Answer 31 ?

Am I right with my guesses?

Thank you in advance!

JackforJava

public class Month {
	private int name;
	private int days;
 
public Month(int name) {
	setMonth(name);
}
 
public int getName() {
	return(name);
}
 
public int getDays() {
	return(days);
}
 
public void setMonth(int name) {
	this.name = name;
	if (name == 9 || name == 4 || name == 6 || name == 11)
		days = 30;
	else if(name == 2)
		days = 28;
	else
		days = 31;
}
 
public String toString() {
	return(this.convertToString() + " has " + days + " days in it.");
}
 
private String convertToString() {
	switch (name) {
		case 1: return "January";
		case 2: return "February";
		case 3: return "March";
		case 4: return "April";
		case 5: return "May";
		case 6: return "June";
		case 7: return "July";
		case 8: return "August";
		case 9: return "September";
		case 10: return "October";
		case 11: return "November";
		case 12: return "December";
 
		default: return "Invalid month";
	}
}
}
public class SchoolMonth extends Month {
	private boolean holidays; // are there any holidays in this month?
	private char semester; // 'F'all, 'S'pring, s'U'mmer
 
	public SchoolMonth(int name) {
            super(name);
            setSemester();
            setHolidays();
        }
 
 
	public boolean containsHolidays() {
		return holidays;
	}
 
 
public void setSemester(){
if (getName() > 7) // Aug - Dec
semester = 'F';
else if(getName() > 4) // May - July
semester = 'U';
else
semester = 'S'; // Jan - April
}
 
 
public void setHolidays() {
if (getName() != 3 && getName() !=4 && getName() != 6 && getName() !=8)
holidays = true;
}
 
public String toString(){
return (super.toString() + " It is in the " + semester + "semester.");
}
 
 
}

Please look at the pdf file.

quiz1.JPG
quiz2.JPG

Please, have a look I've posted now 2 images.

1. public class Month {
2. private int name;
3. private int days;
4. ...
5. public Month(int name) {
6. setMonth(name);
7. }
8. ...
9. public int getName() {
10. return(name);
11. }
12. ...
13. public int getDays() {
14. return(days);
15. }
16. ...
17. public void setMonth(int name) {
18. this.name = name;
19. if (name == 9 || name == 4 || name == 6 || name == 11)
20. days = 30;
21. else if(name == 2)
22. days = 28;
23. else
24. days = 31;
25. }
26. ...
27. public String toString() {
28. return(this.convertToString() + " has " + days + " days in it.");
29. }
30. ...
31. private String convertToString() {
32. switch (name) {
33. case 1: return "January";
34. case 2: return "February";
35. case 3: return "March";
36. case 4: return "April";
37. case 5: return "May";
38. case 6: return "June";
39. case 7: return "July";
40. case 8: return "August";
41. case 9: return "September";
42. case 10: return "October";
43. case 11: return "November";
44. case 12: return "December";
45. ...
46. default: return "Invalid month";
47. }
48. }
49. }
50. public class SchoolMonth extends Month {
51. private boolean holidays; // are there any holidays in this month?
52. private char semester; // 'F'all, 'S'pring, s'U'mmer
53. ...
54. public SchoolMonth(int name) {
55. super(name);
56. setSemester();
57. setHolidays();
58. }
59. ...
60. public boolean containsHolidays() {
61. return holidays;
62. }
63. ...
64. public void setSemester(){
65. if (getName() > 7) // Aug - Dec
66. semester = 'F';
67. else if(getName() > 4) // May - July
68. semester = 'U';
69. else
70. semester = 'S'; // Jan - April
71. }
72. ...
73. public void setHolidays() {
74. if (getName() != 3 && getName() !=4 && getName() != 6 && getName() !=8)
75. holidays = true;
76. }
77. ...
78. public String toString(){
79. return (super.toString() + " It is in the " + semester +
80. "semester.");
81. }
82. ...
83. }

--- Update ---

The questions:.

1) Line (?) is the first line of a mutator method that is inherited by the subclass.

2) Line (?) is the first line of a method in the super class that is not inherited by the subclass.

It should be:
1) setMonth() - Line 18
2) convertToString() - Line 32

By any chance this exam is the Java SE 7 (number) certification? This a access modifier, private, interface @ override. Parent class and its methods are overwritten in the subclass. May share the same values used when that method is invoked or shared by other classes of that package. I didn't see the exam. Just saw the book on it.