The Web Browser Web browsers are deceptively complex programs. The simple task of opening a web page carries a lot of steps: networking calls, protocol exchanges, rendering graphics, download and storage, JavaScript functionality, etc. It’s a lot to handle. The myriad number of tasks at hand provides a great example of different situations for collecting and managing information. Perfect for trying out the Java Collections Classes. Program requirements: • Create a new class, called “WebBrowser.” Inside it, place your main program. When run, your program will ask the user for commands. The following commands should be provided: o GOTO o DOWNLOAD o BACK o FORWARD o SHOW_DOWNLOADS o CLEAR_DOWNLOADS o SHOW_HISTORY o CLEAR_HISTORY o END • For the command above, should be any user-input String in the format of a typical web address. • Inside your WebBrowser main program, create the following: o A Stack of Strings called “backwards” o A Stack of Strings called “forwards” o A Queue of Strings called “downloads” o A List of Strings called “history” o A String called “currentURL” • The command GOTO should place the user’s entered into the currentURL. It should also add it to the “history” list. If currentURL was not empty, the previous URL should be added to the “backwards” Stack. Print out the currentURL • When the user types BACK, remove the top of the Stack “backwards” and place it in currentURL. Put the previous URL into the “forwards” Stack. If the “backwards” Stack is empty, alert the user that nothing happened. Print out the currentURL • When the user types FORWARD, remove the top of the Stack “forwards” and place it in currentURL. Put the previous URL into the “backwards” Stack. If the “forwards” Stack is empty, alert the user that nothing happened. Print out the currentURL • If a user types GOTO at any point, clear the “forwards” Stack. (Logically, once a user goes to a new site, the trail forward is lost.) • If a user types DOWNLOAD, add the currentURL to “downloads” • If a user types SHOW_DOWNLOADS, print the contents of “downloads” • If a user types CLEAR_DOWNLOADS, empty the contents of “downloads” • If a user types SHOW_HISTORY, print the contents of “history” • If a user types CLEAR_HISTORY, empty the contents of “history” • If a user types END, exit the program Include appropriate comments throughout your code.

The Web Browser Web browsers are deceptively complex programs. The simple task of opening a web page carries a lot of steps: networking calls, protocol exchanges, rendering graphics, download and storage, JavaScript functionality, etc. It’s a lot to handle. The myriad number of tasks at hand provides a great example of different situations for collecting and managing information. Perfect for trying out the Java Collections Classes. Program requirements: • Create a new class, called “WebBrowser.” Inside it, place your main program. When run, your program will ask the user for commands. The following commands should be provided: o GOTO o DOWNLOAD o BACK o FORWARD o SHOW_DOWNLOADS o CLEAR_DOWNLOADS o SHOW_HISTORY o CLEAR_HISTORY o END • For the command above, should be any user-input String in the format of a typical web address. • Inside your WebBrowser main program, create the following: o A Stack of Strings called “backwards” o A Stack of Strings called “forwards” o A Queue of Strings called “downloads” o A List of Strings called “history” o A String called “currentURL” • The command GOTO should place the user’s entered into the currentURL. It should also add it to the “history” list. If currentURL was not empty, the previous URL should be added to the “backwards” Stack. Print out the currentURL • When the user types BACK, remove the top of the Stack “backwards” and place it in currentURL. Put the previous URL into the “forwards” Stack. If the “backwards” Stack is empty, alert the user that nothing happened. Print out the currentURL • When the user types FORWARD, remove the top of the Stack “forwards” and place it in currentURL. Put the previous URL into the “backwards” Stack. If the “forwards” Stack is empty, alert the user that nothing happened. Print out the currentURL • If a user types GOTO at any point, clear the “forwards” Stack. (Logically, once a user goes to a new site, the trail forward is lost.) • If a user types DOWNLOAD, add the currentURL to “downloads” • If a user types SHOW_DOWNLOADS, print the contents of “downloads” • If a user types CLEAR_DOWNLOADS, empty the contents of “downloads” • If a user types SHOW_HISTORY, print the contents of “history” • If a user types CLEAR_HISTORY, empty the contents of “history” • If a user types END, exit the program Include appropriate comments throughout your code.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Java Programming Assignment 6 – The Web Browser Web browsers are deceptively complex programs. The simple task of opening a web page carries a lot of steps: networking calls, protocol exchanges, rendering graphics, download and storage, JavaScript functionality, etc. It’s a lot to handle. The myriad number of tasks at hand provides a great example of different situations for collecting and managing information. Perfect for trying out the Java Collections Classes. Program requirements: • Create a new class, called “WebBrowser.” Inside it, place your main program. When run, your program will ask the user for commands. The following commands should be provided: o GOTO o DOWNLOAD o BACK o FORWARD o SHOW_DOWNLOADS o CLEAR_DOWNLOADS o SHOW_HISTORY o CLEAR_HISTORY o END • For the command above, should be any user-input String in the format of a typical web address. • Inside your WebBrowser main program, create the following: o A Stack of Strings called “backwards” o A Stack of Strings called “forwards” o A Queue of Strings called “downloads” o A List of Strings called “history” o A String called “currentURL” • The command GOTO should place the user’s entered into the currentURL. It should also add it to the “history” list. If currentURL was not empty, the previous URL should be added to the “backwards” Stack. Print out the currentURL • When the user types BACK, remove the top of the Stack “backwards” and place it in currentURL. Put the previous URL into the “forwards” Stack. If the “backwards” Stack is empty, alert the user that nothing happened. Print out the currentURL • When the user types FORWARD, remove the top of the Stack “forwards” and place it in currentURL. Put the previous URL into the “backwards” Stack. If the “forwards” Stack is empty, alert the user that nothing happened. Print out the currentURL • If a user types GOTO at any point, clear the “forwards” Stack. (Logically, once a user goes to a new site, the trail forward is lost.) • If a user types DOWNLOAD, add the currentURL to “downloads” • If a user types SHOW_DOWNLOADS, print the contents of “downloads” • If a user types CLEAR_DOWNLOADS, empty the contents of “downloads” • If a user types SHOW_HISTORY, print the contents of “history” • If a user types CLEAR_HISTORY, empty the contents of “history” • If a user types END, exit the program Include appropriate comments throughout your code.

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