Java in 21 Days (7th 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.

  Answer (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.

Source Files

• AdvogatoClient.java
• DmozHandler.java
• DmozHandlerImpl.java
• DmozServer.java
• PingClient.java
• PingHandler.java
• PingHandlerImpl.java
• PingServer.java
• SiteClient.java

Activities

• Solution 1: AdvogatoClient.java. You can view the author's Advogato blog entry at the username rcaden.
• Solution 2: PingClient.java, PingHandler.java, PingHandlerImpl.java and PingServer.java. 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.