The price of gold. source: nowiknow.com. moodle.yorku.ca CSE 1020
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1 The price of gold source: nowiknow.com
2 The price of gold Problem Write an app that prints the price of one kilo of gold in US dollars.
3 Static attributes public static type attributename All attributes we will use in our apps are public. All attributes we will use in our apps are static. type is the type of the attribute.
4 Static attributes public static final type attributename All attributes we will use in our apps are public. All attributes we will use in our apps are static. The attribute is a constant. type is the type of the attribute.
5 Static attributes public static final double GRAMS PER TROY OUNCE What is the type of the attribute GRAMS PER TROY OUNCE?
6 Static attributes public static final double GRAMS PER TROY OUNCE What is the type of the attribute GRAMS PER TROY OUNCE? double.
7 Static attributes public static final double GRAMS PER TROY OUNCE What is the type of the attribute GRAMS PER TROY OUNCE? double. Is the attribute GRAMS PER TROY OUNCE a constant?
8 Static attributes public static final double GRAMS PER TROY OUNCE What is the type of the attribute GRAMS PER TROY OUNCE? double. Is the attribute GRAMS PER TROY OUNCE a constant? Yes.
9 Using a static attribute Consider the attribute public static type attributename in the class classname. The attribute is used as classname.attributename.
10 Using a static attribute How do you use the attribute GRAMS PER TROY OUNCE of the class Gold?
11 Using a static attribute How do you use the attribute GRAMS PER TROY OUNCE of the class Gold? Gold.GRAMS PER TROY OUNCE
12 Code convention for names of constants Use uppercase characters. If the name is made up of more than one word, separate the words by an underscore. In the lab, you can use the command checkstyle.sh to check if your app adheres to some of the code conventions. For example, typing checkstyle.sh GoldPrice.java may result in the following: There were some style errors: Starting audit... GoldPrice.java :7:19: Constant gramsperkilo should be in all uppercase, start with a letter, and contain only letters, digits, and. Audit done.
13 Memory model Gold.main 1000 GRAMS PER KILO ounceperkilo price. 112 Gold GRAMS PER TROY OUNCE.
14 The price of gold Problem Write an app that prints the price of one kilo of gold in Canadian dollars.
15 public static double convert(double amount, String from, String to) What is the return type of the method convert?
16 public static double convert(double amount, String from, String to) What is the return type of the method convert? double.
17 public static double convert(double amount, String from, String to) What is the return type of the method convert? double. How many parameters does the method convert have?
18 public static double convert(double amount, String from, String to) What is the return type of the method convert? double. How many parameters does the method convert have? Three.
19 public static double convert(double amount, String from, String to) What is the signature of the method convert?
20 public static double convert(double amount, String from, String to) What is the signature of the method convert? convert(double, String, String)
21 Precondition The precondition amount >= 0.0, from == Currency.CAD from == Currency.USD from == Currency.EUR, to == Currency.CAD to == Currency.USD to == Currency.EUR can be read as amount 0.0 and (from == Currency.CAD or from == Currency.USD or from == Currency.EUR) and (to == Currency.CAD or to == Currency.USD or to == Currency.EUR)
22 Precondition The precondition amount >= 0.0, from == Currency.CAD from == Currency.USD from == Currency.EUR, to == Currency.CAD to == Currency.USD to == Currency.EUR can be read as amount 0.0 and (from == Currency.CAD or from == Currency.USD or from == Currency.EUR) and (to == Currency.CAD or to == Currency.USD or to == Currency.EUR) Who is responsible for the precondition, the client of the implementer?
23 Precondition The precondition amount >= 0.0, from == Currency.CAD from == Currency.USD from == Currency.EUR, to == Currency.CAD to == Currency.USD to == Currency.EUR can be read as amount 0.0 and (from == Currency.CAD or from == Currency.USD or from == Currency.EUR) and (to == Currency.CAD or to == Currency.USD or to == Currency.EUR) Who is responsible for the precondition, the client of the implementer? The client.
24 Contract If Currency.convert(1.0, Currency.USD, Currency.CAD) returns 1.03, who is to blame?
25 Contract If Currency.convert(1.0, Currency.USD, Currency.CAD) returns 1.03, who is to blame? The implementer, since the client has done its job by providing arguments that satisfy the precondition, whereas the implementer did not satisfy the postcondition.
26 Contract If Currency.convert(1.0, Currency.USD, "YEN") returns 99.13, who is to blame?
27 Contract If Currency.convert(1.0, Currency.USD, "YEN") returns 99.13, who is to blame? The client, since the third argument YEN does not satisfy the precondition, which is the client s responsibility.
28 The price of gold Problem Write an app that pops up a dialog box with the title The Price of Gold and the message Enter the amount of gold in kilos and, after the user has entered the amount k and clicks the OK button, pops up another dialog box with the title The Price of k kilos of Gold and the current price of k kilos of Gold in Canadian dollars.
29 public static String showinputdialog(component parent, String message, String title, int messagetype) 1 of class JOptionPane of package javax.swing. What is the return type of the method showinputdialog? 1 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
30 public static String showinputdialog(component parent, String message, String title, int messagetype) 1 of class JOptionPane of package javax.swing. What is the return type of the method showinputdialog? String. 1 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
31 public static String showinputdialog(component parent, String message, String title, int messagetype) 1 of class JOptionPane of package javax.swing. What is the return type of the method showinputdialog? String. How many parameters does the method showinputdialog have? 1 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
32 public static String showinputdialog(component parent, String message, String title, int messagetype) 1 of class JOptionPane of package javax.swing. What is the return type of the method showinputdialog? String. How many parameters does the method showinputdialog have? Four. 1 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
33 public static String showinputdialog(component parent, String message, String title, int messagetype) of class JOptionPane of package javax.swing. What is the signature of the method showinputdialog? 2 We will come back to null later in the course.
34 public static String showinputdialog(component parent, String message, String title, int messagetype) of class JOptionPane of package javax.swing. What is the signature of the method showinputdialog? showinputdialog(component, String, String, int) 2 We will come back to null later in the course.
35 public static String showinputdialog(component parent, String message, String title, int messagetype) of class JOptionPane of package javax.swing. What is the signature of the method showinputdialog? showinputdialog(component, String, String, int) In our case, we do not need a parent component (whatever that may be), and therefore we use the default value null as the first argument. 2 2 We will come back to null later in the course.
36 public static double parsedouble(string s) of class Double of package java.lang. What is the return type of the method parsedouble?
37 public static double parsedouble(string s) of class Double of package java.lang. What is the return type of the method parsedouble? double.
38 public static double parsedouble(string s) of class Double of package java.lang. What is the return type of the method parsedouble? double. How many parameters does the method parsedouble have?
39 public static double parsedouble(string s) of class Double of package java.lang. What is the return type of the method parsedouble? double. How many parameters does the method parsedouble have? One, of type String.
40 public static void showmessagedialog(component parent, String message, String title, int messagetype) 3 of class JOptionPane of package javax.swing. What is the return type of the method showmessagedialog? 3 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
41 public static void showmessagedialog(component parent, String message, String title, int messagetype) 3 of class JOptionPane of package javax.swing. What is the return type of the method showmessagedialog? None. 3 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
42 public static void showmessagedialog(component parent, String message, String title, int messagetype) 3 of class JOptionPane of package javax.swing. What is the return type of the method showmessagedialog? None. How many parameters does the method showmessagedialog have? 3 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
43 public static void showmessagedialog(component parent, String message, String title, int messagetype) 3 of class JOptionPane of package javax.swing. What is the return type of the method showmessagedialog? None. How many parameters does the method showmessagedialog have? Four. 3 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
44 public static void showmessagedialog(component parent, String message, String title, int messagetype) of class JOptionPane of package javax.swing. What is the signature of the method showmessagedialog?
45 public static void showmessagedialog(component parent, String message, String title, int messagetype) of class JOptionPane of package javax.swing. What is the signature of the method showmessagedialog? showmessagedialog(component, String, String, int)
46 public static void showmessagedialog(component parent, String message, String title, int messagetype) of class JOptionPane of package javax.swing. What is the signature of the method showmessagedialog? showmessagedialog(component, String, String, int) In our case, we do not need a parent component (whatever that may be), and therefore we use the default value null as the first argument.
47 public static String format(string format, double value) 4 of class String of package java.lang. What is the return type of the method format? 4 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
48 public static String format(string format, double value) 4 of class String of package java.lang. What is the return type of the method format? String. 4 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
49 public static String format(string format, double value) 4 of class String of package java.lang. What is the return type of the method format? String. How many parameters does the method format have? 4 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
50 public static String format(string format, double value) 4 of class String of package java.lang. What is the return type of the method format? String. How many parameters does the method format have? Two. a a As we will see later, the answer is at least one. 4 The signature in the API is slightly different. We will come back to this when we cover Chapter 9 of the textbook.
51 The price of gold Write an app that pops up a dialog box with the title The Price of Gold and the message Enter the amount of gold in kilos and, after the user has entered the amount k and clicks the OK button, pops up another dialog box with the title The Price of k kilos of Gold and the current price of k kilos of Gold in Canadian dollars. If the users enters a negative amount, the app crashes with the message The amount of gold cannot be negative.
52 To do Study Section 2.3 of the textbook.
53 Test 1 When: Friday January 17, during the lab (14:30 16:00) Where: Lassonde building, labs 1006, 1004, 1002 Material: Chapter 1 of the textbook What: One programming question similar to Check01C and five multiple choice/short answer questions Advise: Do the five multiple choice/short answer questions first Note: Your code is not only marked for correctness but also style
54 How to submit your code during the test? To submit your code, use something like submit 1020 test1 Test1A.java If successful, you see something like submitted: Test1A.java (123 bytes) All files successfully submitted. If you are in the incorrect directory, you see something like error: cannot find source Test1A.java
55 How to submit your code during the test? For those using eclipse, first locate the file Test1A.java. Use the commands ls and cd. For example, if you named your project test then use something like cd workspace/test/src Advice: if you plan to use eclipse, get familiar with the commands ls and cd before the test.
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