Files containing ____, like those in the accompanying figure, are available from a variety of sources.
A. task panes
B. search terms
C. colors
D. graphics
Answer: D
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Templates enable us to specify, with a single code segment, an entire range of related functions called _________, or an entire range of related classes called _____________.
Fill in the blank(s) with the appropriate word(s).
(Arithmetic Calculator Application) Write an application that allows users to enter two numbers that can then be added or multiplied (Fig. 9.25). Users should enter each num- ber in an input dialog, displayed when the Enter Operands JButton is clicked. Each number should be appended to the Operands: JTextArea. The Add and Multiply JButtons are ini- tially disabled, but they should be enabled after the two operands are input. Once a result is calculated using the Add JButton, this JButton should be disabled until two new numbers are added. Once a result is calculated using the Multiply JButton, this JButton should be disabled until two new numbers are added.
a) Copying the template to your working directory. Copy the directory C:Examples Tutorial09ExercisesArithmeticCalculator to your C:SimplyJava directory.
b) Opening the template file. Open the ArithmeticCalculator.java file in your text editor. Lines 25–26 in the template already declare two instance variables of type double—value1 and value2—that you will need in this application. Variable value1 will store the first value entered by the user, and value2 will store the second value entered by the user. Each variable is initialized to 0.
c) Displaying an input dialog. The template contains a do…while statement in the enterOperandsJButtonActionPerformed event handler, beginning in line 145. Add code in lines 147–148 (within the do…while statement) to display an input dialog that asks the user to enter an operand. Use two lines to increase readability. Store the value the user enters in the input dialog in the variable input (which is declared in line 139).
d) Retrievin
An example of a natural key is sequential numbering from the AutoNumber data type
Indicate whether the statement is true or false
A stateful packet inspection firewall examines each packet, and denies or permits access based not only on the current packet, but also on data derived from previous packets in the conversation
Indicate whether the statement is true or false.