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Chapter 14: Problem 15

Suppose the file MyApplet.jawa contains the Java source code for an applet. What tag would you write in an HTML document to run the applet in an area that is 400 pixels wide by 200 pixels high?

Short Answer

Expert verified
Answer: The HTML tag for applets is . To create an applet tag for a file "MyApplet.jawa" with dimensions of 400 pixels by 200 pixels, you would write the following code:

Step by step solution

01

Identify the HTML tag for applets

The HTML tag for applets is . This tag is used to embed a Java applet within an HTML document.
02

Define the width and height of the applet

To specify the dimensions of the applet in the HTML document, we use the "width" and "height" attributes within the tag. The width and height should be set to 400 pixels and 200 pixels, respectively.
03

Specify the applet source file

To indicate the Java source code file for the applet, we use the "code" attribute within the tag. In this case, we need to use the file named "MyApplet.jawa".
04

Write the complete applet tag

Combine the attributes from Steps 2 and 3 with the tag from Step 1 to create the complete applet tag: This tag will run the Java applet from the "MyApplet.jawa" file in an area that is 400 pixels wide by 200 pixels high in an HTML document.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

HTML applet tag
The HTML tag is a legacy element used to embed a Java applet within an HTML document. Although it's not supported in HTML5 and newer versions (which recommend using the tag instead), the tag was widely used in past to run Java programs directly in the web browser. This tag includes various attributes to control the applet's behavior and presentation.

For instance, to run a simple Java applet, you would declare it within the HTML code using the tag. This element acts as a placeholder informing the browser where the applet should be displayed on the webpage. While integrating the applet, it’s critical to reference the correct source file—usually a compiled Java file with a .class extension—using the 'code' attribute, and optionally include dimensions and other parameters to customize its operation within the page.
Java applet dimensions
Setting the correct dimensions for a Java applet is crucial for its appearance and functionality within a webpage. This is done using the 'width' and 'height' attributes of the tag. These attributes define the size of the area that the applet will occupy on the web page. For example, if you want the applet to take up a rectangular area that is 400 pixels wide and 200 pixels high, you would set the 'width' attribute to '400' and the 'height' attribute to '200'.

You must carefully consider the applet's intended use and the overall layout of your webpage when deciding on these dimensions. Incorrect dimensions might cause the applet to render improperly, possibly overlapping other page content or displaying scroll bars. It's important to test the applet in various browsers to ensure that the chosen dimensions provide a consistent user experience.
Java applet source file
The source file of a Java applet is the compiled Java code that contains the implementation of the applet. It is typically a file with a .class extension, which is created after successfully compiling a .java source code file. To link this compiled applet to your HTML page, the 'code' attribute of the tag is used. This attribute specifies the name of the class file which contains the applet that you wish to run.

For instance, if you have an applet compiled in a file named 'MyApplet.class', your tag's 'code' attribute will reference this file. As a good practice, the applet's source file should be placed in the same directory as the HTML file or appropriately referenced using a relative or absolute path. Also, ensure that the class file is accessible by the web server so that it can be loaded by the browsers that visit the site.

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