The ____ stores objects that do not appear in the user interface while an application is running.
A. component tray
B. task list
C. menu tray
D. object tray
Answer: A
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Discuss whether the following operations are idempotent: i) Pressing a lift (elevator) request button; ii) Writing data to a file; iii) Appending data to a file. Is it a necessary condition for idempotence that the operation should not be associated with any state?
What will be an ideal response?
How does polymorphism promote extensibility?
What will be an ideal response?
Modify the Miles Per Gallon application so that it includes exception handling to handle the NumberFormatExcep- tion when converting the strings in the JTextFields to doubles (Fig. 24.15). The original application allowed the user to input the number of miles driven and the number of gallons used for a tank of gas, in order to determine the number of miles the user was able to drive on one gallon of gas.
a) Copying the template to your working directory. Copy the C:Examples Tutorial24ExercisesEnhancedMilesPerGallon directory to your C:Simply- Java directory.
b) Opening the template file. Open the MilesPerGallon.java file in your text editor. c) Adding a try block. Find the calculateMPGJButtonActionPerformed method,
which immediately follows createUserInterface. Enclose lines 113–120 in a try
block.
d) Adding a catch block. Immediately following the try block you added in Step c, add a catch block to catch a NumberFormatException. Inside the catch block, add code to display an error message dialog at the center of the running application.
e) Saving the application. Save your modified source code file.
f) Opening the Command Prompt window and changing directories. Open the Com- mand Prompt window by selecting Start > Programs > Accessories > Command Prompt. Change to your working directory, EnhancedMilesPerGallon, by typing cd C:SimplyJavaEnhancedMilesPerGallon.
By using the Navigation Pane, you can see a list of all Access Objects included in the database
Indicate whether the statement is true or false