qr code library java free download 8: Objects in Java

Drawer QR-Code in Java 8: Objects

8: Objects
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pr8_1html prjs8_1js
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In this project, you create objects on your own and develop the skills involved in object creation The script will create a computer object and then use properties, methods, and instances of the object to create feature lists and price lists for the different types of computers
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1 Create an HTML page and save it as pr8_1html Add the necessary script tags to point to
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an external JavaScript file named prjs8_1js
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2 Create an external JavaScript file and save it as prjs8_1js Use it for steps 3 12 3 Create an object named computer that has three properties named speed, hdspace, and ram 4 Create an instance of the computer object and name it work_computer Send the string
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values of 2GHz for the speed parameter, 80GB for the hdspace parameter, and 1GB for the ram parameter
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5 Create an instance of the computer object and name it home_computer Send the string
values of 15GHz for the speed parameter, 40GB for the hdspace parameter, and 512MB for the ram parameter
6 Create an instance of the computer object and name it laptop_computer Send the string
values of 1GHz for the speed parameter, 20GB for the hdspace parameter, and 256MB for the ram parameter
7 Create a function named get_price() that will calculate the price of a computer The base
price of a computer is 500 and should be assigned to a variable named the_price If the speed property of an object is equal to 2GHz, add 200 to the value of the_price; otherwise, add 100 to the_price If the hdspace property of an object is 80GB, add 50 to the value of the_price; otherwise, add 25 to the_price If the ram property of an object is 1GB, add 150 to the value of the_price; otherwise, add 75 to the_price End the function with a return statement that returns the value of the variable the_price
8 Add a call to the function created in step 6 to the computer object Give the method the
name price
9 Assign the value returned by the price() method when used with the work_computer
instance of the object to a variable named work_computer_price
10 Assign the value returned by the price() method when used with the home_computer
instance of the object to a variable named home_computer_price
11 Assign the value returned by the price() method when used with the laptop_computer
instance of the object to a variable named laptop_computer_price
(continued)
JavaScript: A Beginner s Guide
12 Write the features and price for each type of computer to the browser screen in the same
format you used in the car example earlier in the chapter
13 Save the JavaScript file and view the HTML file in your browser You should have a list of
features and the price for each computer written on the screen
Try This Summary
In this project, you were able to use your new knowledge of objects to create an object with properties and a method function You were able to create a Web page that displays the prices of different computers in the browser
Understanding Predefined JavaScript Objects
In JavaScript, there are many predefined objects you can use to gain access to certain properties or methods you may need You can make your scripts even more interactive once you learn the various objects and what you can do with them This book will be covering a number of the major predefined objects Some of them will be the basis for an entire chapter, while others are smaller and may only need a portion of a chapter To get started, in this chapter, you are going to look at the navigator object and history objects, and what you can do with them
The Navigator Object
The navigator object gives you access to various properties of the viewer s browser, such as its name, version number, and more It got its name from the Netscape Navigator browser, which preceded Mozilla/Firefox The navigator object is part of the window object, which means you can access its properties and methods using windownavigatorproperty_or_method_name, but it can also be shortened to simply navigatorproperty_or_method_name This is true even for direct properties or methods of the window object as well (for example, windowalert( Hi ); could be shortened to simply alert( Hi ); and it would still be valid) You ll commonly see such properties and methods of the window object shortened in this way to save extra typing or to help shorten the source code First, take a look at the properties of the navigator object
Properties
The properties of the navigator object let you find out various things about the browser the viewer is using The properties of the navigator object cannot be changed, because they are set as read-only This is so you don t try to change the user s browser version from 60 to 70 or something similar Instead, you can just find out what the value of the property is and use it to allow your scripts to do different things for different browsers Table 8-1 shows the properties of the navigator object and the values returned by each property Also, if a property only works in one or two of the three major browsers mentioned in this book, there is a note in parentheses for that property
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