Java in 21 Days (7th Edition) Day 14: Developing Swing Applications

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Notes and Corrections

• View the Certification Practice quiz solution

• Certification answer: Answer (b) is correct. The application compiles successfully, but it does not display anything in the frame because nothing was added to the frame. The slider should be added to the frame by calling add(value) after the slider has been created.

  Answer (a) is incorrect. The application compiles but does not run correctly because it doesn't display the slider.

  Answer (c) is incorrect. The frame is empty, but this does not prevent the application from compiling successfully.

  Answer (d) is incorrect. The new AskFrame() statement is correct. It calls the AskFrame constructor without assigning the object to a variable.

• Oracle has removed the demo programs for Java Web Start. To try one, visit this link in Internet Explorer or Mozilla Firefox. (Google Chrome does not support Web Start.)

Source Files

• DiceRoller.jar
• DiceRoller.java
• DiceRoller.jnlp
• DiceWorker.java
• PageData.java
• PageData.jnlp
• PageData2.jnlp
• pagedataicon.gif

Activities

• Solution 1: DiceRoller.java, DiceRoller.jar, and DiceRoller.jnlp.
• Solution 2: PageData2.jnlp.