The ____ shows how a business works from the perspective of those who actually interact with the business.
A. use diagram
B. use case diagram
C. case diagram
D. symbol diagram
Answer: B
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(To-Do List Application) Use a JTextArea as a to-do list. Enter each item in a JTextField, and add it to the JTextArea by clicking a JButton. The item should be displayed in a numbered list as in Fig. 8.27. To do this, you will need JTextArea method getLineCount, which returns the number of lines in a JTextArea. The following statement assigns the number of lines displayed in the outputJTextArea to int variable counter: getLineCount, which returns the number of lines in a JTextArea. The following statement assigns the number of lines displayed in the outputJTextArea to int variable counter:
```
int counter = outputJTextArea.getLineCount();
```
```
a) Copying the template to your working directory. Copy the directory C:Examples Tutorial08ExercisesToDoList to your C:SimplyJava directory.
b) Opening the template file. Open the ToDoList.java file in your text editor.
c) Adding code to the event handler for the Add JButton. Add code to the addJBut- tonActionPerformed event handler (which begins in line 82) to obtain the number of lines displayed in the outputJTextArea. Get the user input from taskJText- Field append it the outputJTextArea with a line number in front of it. After the input is added to the outputJTextArea, clear the taskJTextField.
d) Saving the application. Save your modified source code file.
e) Opening the Command Prompt window and changing directories. Open the Command Prompt window by selecting Start > Programs > Accessories > Command Prompt. Change to your working directory by typing cd C:SimplyJavaToDoList.
```
Which of the following statements about abstract superclasses is true?
a. abstract superclasses may contain data. b. abstract superclasses may not contain implementations of methods. c. abstract superclasses must declare all methods as abstract. d. abstract superclasses must declare all data members not given values as abstract.
When a chart is selected and you click the Chart Tools Design tab and the Change Chart Type button, ________ display in the left pane and ________ display in the right pane
A) common charts; less common charts B) chart subtypes; chart types C) chart types; chart subtypes D) 3-D chart types; 2-D chart types
Which of the code examples will force the display of quotation marks before and after the sentence?
A) " "This text is surrounded in quotes" " B) """ This text is surrounded in quotes """ C) "" This text is surrounded in quotes "" D) " This text is surrounded in quotes "