Tutorial Java Applets: HelloWorld and variants

Hello World

The simplest java applet:
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Java source: HelloWorld.java
HTML source: HelloWorld.html

A good applet takes its crucial values from HTML via parameters, rather than hardwiring them. Here's a "Hello World" which takes its string via a parameter, allowing the HTML writer to customize it to display any text desired:

Java source: Label1.java
HTML source: Label1.html

A good applet also allows minor parameters to be customized, without forcing the HTML writer to specify all of them every time. Also, it is more efficient to process parameters just once at startup, rather than every time the applet repaints. Here's a better version of our applet:
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Java source: Label2.java
HTML source: Label2.html

A good applet should also have a getParameterInfo method summarizing the parameters it accepts. Our final version adds this method plus parameters controlling background and foreground color:
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Java source: Label3.java
HTML source: Label3.html