Hour 4: Understanding How Java Programs Work

Notes and Corrections

• At the end of this hour, the workshop is a guided tour of several Java applets. Each of these shows how a Java program on the Web can be modified with the use of the PARAM tag. Visit each of the following pages with a Web browser that supports Java:.
  • The Frog applet
  • The Puzzle applet
  • The RandomText applet

Source Files

• DisplayXY.class
• DisplayXY.html
• DisplayXY.java
• NewRoot.class
• NewRoot.java
• NewRootApplet.class
• NewRootApplet.html
• NewRootApplet.java
• Root.class
• Root.java
• RootApplet.class
• RootApplet.html
• RootApplet.java

Reader Questions

• None.

Activities

• Solution #1: After the book went to press, EarthWeb moved its applet directory from Gamelan to JARS, the Java Applet Ratings Service. Visit the JARS Web site and use the search term Headline to display applets that display news headlines.
• Solution #2: DisplayXY.java, DisplayXY.class, and DisplayXY.html.