Java 6 in 21 Days (5th Edition) Day 20: XML Web Services

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Notes and Corrections

• View the Certification Practice quiz solution

• Certification answer: Answer (a) is correct. When two expressions are combined with the && (logical and) operator, if the expression on the left is not true, the expression on the right will never be evaluated. The y variable is never incremented, and because the combined expression is false, the statement y = y + 2; is not executed.

  Answers (b) is incorrect. If the & (and) operator had been used to combine two expressions instead of the && (logical and) operator, this would be the correct answer.

  Answers (c) and (d) are incorrect.

• Apache stopped offering XML-RPC 2.0 for download after releasing version 3.0. You can download Apache XML-RPC 2.0, the version of the class library used in this chapter, from this site. Unpack the archive and make the xmlrpc-2.0 folder available in your Java classpath.

Source Files

• AdvogatoClient.class
• AdvogatoClient.java
• DmozHandler.class
• DmozHandler.java
• DmozHandler.properties
• DmozServer.class
• DmozServer.java
• PingClient.class
• PingClient.java
• PingHandler.class
• PingHandler.java
• PingServer.class
• PingServer.java
• SiteClient.class
• SiteClient.java
• dmozdata.mdb

Activities

• Solution 1: AdvogatoClient.java and AdvogatoClient.class. You can view the author's Advogato blog entry at the username rcaden.
• Solution 2: PingClient.java, PingClient.class, PingHandler.java, PingHandler.class, PingServer.java, and PingServer.class. To test it, run the PingServer application in one window and run PingClient in another with two arguments: a web site's name and its URL.