What kind of DNS record is used to resolve a name to an IP address?
A. A record
B. PTR record
C. SPF record
D. MX record
A. A record
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Create an application that mimics the functionality of a vending machine. Your application’s GUI has been completed for you (Fig. 14.18). Store the prices of each item for sale in the vending machine in an instance variable. Also, add the code that will display the price of an item when the item’s number has been entered and Enter JButton has been clicked.
a) Copying the template to your working directory. Copy the C:Exam- plesTutorial14ExercisesVendingMachine2 directory to your C:SimplyJava directory.
b) Opening the template file. Open the VendingMachine.java file in your text editor. c) Adding instance variables. After the last GUI component is declared (line 53),
declare private String instance variables to store the prices of each of the snacks.
Each String should be in the form "$0.00" where the price of the snack is substi- tuted for the zeros. The variables’ names and prices should be snackPrice1 ("$1.25"), snackPrice2 ("$0.50"), snackPrice3 ("$1.25"), snackPrice4 ("$1.00"), snackPrice5 ("$1.25"), snackPrice6 ("$1.25"), snackPrice7 ("$1.00") and snackPrice8 ("$0.50").
d) Coding the enterJButtonActionPerformed method. Locate the enterJButtonAc- tionPerformed method. In this method, store the user input entered in the inputJ- TextField. Then, use a switch statement to di
I don’t need to see it very often, but when I do, I have to be able to get at it quickly. I think we lost the last contract because the information I needed was buried in a stack of paper on someone’s desk somewhere,” says Luke Alover, an architect describing the company’s problems to one of the analysts assigned to the new systems project. “What I need is instant information about how much a building of that square footage cost the last time we bid it; what the basic materials such as steel, glass, and concrete now cost from our three top suppliers; who our likely competition on this type of building might be; and who comprises the committee that will be making the final decision on who gets the bid. Right now, though, it’s in a hundred reports somewhere. I have to look all over for it.”
a. Given the limited details you have here, write a paragraph to suggest an output method for Luke’s use that will solve some of his current problems. In a second paragraph, explain your reasons for choosing the output method you did. (Hint: be sure to relate output method to output content in your answer.) b. Luke’s current thinking is that no paper record of the output discussed needs to be kept. In a paragraph, discuss what factors should be weighed before displayed output is used to the exclusion of printed reports. c. Make a list of five to seven questions concerning the output’s function in the organization that you would ask Luke and others before deciding to do away with any printed reports currently being used.
Answer the following statements true (T) or false (F)
1) A running thread enters the sleeping state when the thread issues an input/output request. 2) Semaphores provide acquire and release methods because they contain an under- lying lock. 3) A semaphore’s counter can never be less than 0. 4) I/O-bound processes generally benefit most from multithreading.
All of the following are basic models for software distribution EXCEPT ________
A) shareware B) freeware C) charityware D) retail software