When writing a value to an XML attribute, you must enclose the XPath expression within _____.
A. ?curly braces
B. ?angle brackets
C. ?parentheses
D. ?double quotes
Answer: A
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Most calculations are normally performed by ____________ statements.
Fill in the blank(s) with the appropriate word(s).
In the accompanying figure, Item 2 points to the Reorder button, which includes the ____ option to place an image behind the text.
A. Bring to Front B. Send to Back C. Send Downward D. Bring Forward
Which string displayed using the ls ?l command in a Linux terminal indicates that group permissions are set to read and modify?
A. -rm-rm-r-- B. -rw-rw-r-- C. -rwxr--rw- D. -rmxrm-rm-
Enhance the Inventory application that you developed in Tutorial 4 to prevent the user from entering input that is not a number. Use keyboard events to allow the user to press the number keys (0 to 9), the left and right arrow keys, the Backspace key and the Enter key. If any other key is pressed, display a JOption- Pane instructing the user to enter a number (Fig. 22.32).
a) Copying the template to your working directory. Copy the C:Examples Tutorial22ExercisesInventoryEnhanced directory to your C:SimplyJava directory.
b) Opening the template file. Open the Inventory.java file in your text editor.
c) Adding a switch statement. In line 132 (in the cartonsJTextFieldKeyPressed method), begin a switch statement that determines whether a number key, a left or right arrow key or the Backspace key was pressed. Use KeyEvent constants VK_0, VK_1, VK_2, VK_3, VK_4, VK_5, VK_6, VK_7, VK_8, VK_9, VK_LEFT, VK_RIGHT, VK_BACK_SPACE and VK_ENTER. If one of these keys was pressed, use the break state- ment to continue execution.
d) Adding the default statement. At the end of the switch statement, add a default case to determine whether a key other than a valid one for this application was pressed. If an invalid key was pressed, display a JOptionPane that instructs the user to enter a number. Also, reset the text of cartonsJTextField to "0".