The Mysteries of Invisibility Unveiled
Delve into the intriguing world of invisibility and explore the possibilities and challenges associated with this concept. Discover the benefits and disadvantages, hear about scientific advancements, and ponder the question: Will invisibility ever become a reality?
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Presentation Transcript
Two things are involved in the process of putting applets onto web pages The .class files of the applet The html file of the page Remember: any Java source file that compiles correctly will produce a .class file.
Compiled .class files for Java source code should be found: C:/UserName/workspace/NameOfProject/bin It may also be found in C:/UserName/Android/workspace/NameOfProject/ bin
The HTML file should be created inside the same folder as the .class files for the applet. This is to reduce complexity in defining the path to the applet class in the HTML file. You could start creating an HTML file in Notepad by: Starting a new text file, and adding your code from there When it comes time to save, remove the *.txt extension, and add .html to the end of the file instead. (Ex: MyHtmlPage.html)
<html> <applet code= MyJavaApplet.class width= 500 height= 500 > </applet> </html>
HTML is a markup language, using a system of tags to define elements of a document. <html> is a tag that denotes a start of an html file, while </html> denotes the end. Likewise, <applet> and </applet> are used in the same way.
Youll notice inside the first applet tag, there are attributes assigned inside it (code, width, height) code is the directory where the HTML file would be able to find the main .class entry point for the applet. width and height define the size as it appears on the web page. Note that the values assigned to these attributes are defined in double quotes.
If you have to change a line in the source code of the Java files and recompile, you should replace the .class file in the html directory with the new one. When running Java applets, the user must have the Java Runtime Environment installed. For security or other reasons, some systems may not run Java content through web pages.
With the newest version of Java, unsigned applets are not allowed to run on any machine. This means that if we try running our applet through an html page we created, the applet will not run at all, because it is considered a security risk. Therefore, we ll need to create an exception for this.
Open the Java Control Panel On Windows start, search for Configure Java Java\jre7\bin\javacpl.exe Go to the Security tab, and click the Edit Site List button. In the blank space on the dialog, type in the file or html location of the html file you want to run. Ex: http://math.uaa.alaska.edu/~android/ java/unit5/unit5applet Click Add, then OK on both dialogs. You should be able to run that applet now.
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