Introduction - JavaTech: An Introduction to Scientific and Technical Computing with Java

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Hello World!

Figure 1.4

Display of a very basic applet.

HelloWorld .) Then compile the code with

> javac HelloWorld.java

This creates the class file HelloWorld.class .

Applets are intended for display in browsers so you need to create a Web page

file with the proper tags that indicate where the browser should find the class

code and how big a window it should provide to display the applet's graphical

output. (A brief tutorial on HTML coding for Web pages is available in the Web

Course Chapter 1: Supplements section.)

Put the following code into a file called HelloWorld.html :

< html >

<head>

< title > A Simple Applet < /TITLE >

</head>

< body >

</applet >

</body>

</html >

With this < applet > tag the file must reside in the same directory as the

HelloWorld.class file. Open the file HelloWorld.html in your browser

and you should see something like that in Figure 1.4.

1.8.4 Starter programs

We provide with the Web Course the codes for a number of programs that act as

templates into which you insert code to make them do something useful. Since

the term “template” implies something else in object-oriented programming, we

call these starter programs. You can use them to begin a program without starting

from scratch every time.

Avery simple application program, StartApp1.java ,isshown here. You

can insert code snippets, such as those to be discussed in Chapter 2, into the area

indicated.

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