Java 6 in 21 Days (5th Edition) Day 2: The ABCs of Programming

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Notes and Corrections

• View the Certification Practice quiz solution

• Certification answer: Answer (c) is correct.

  Answer (a) is incorrect. The short and int data types cannot hold a number that large. A short variable can hold numbers from -32,768 to 32,767 and an int variable can hold numbers from -2,147,483,648 to 2,147,483,647.

  Answer (b) is incorrect. The int data type holds numbers from -2,147,483,648 to 2,147,483,647.

  Answer (d) is incorrect. The byte data type holds numbers from -128 to 127.

• Page 40: The minus signs are missing from values in Table 2.1: Integer Types. The range for byte values is from -128 to 127, for short values is from -32,768 to 32,767, for int values is from -2,147,483,648 to 2,147,483,647, and for long values is from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
• Pages 49-50: The comments in the Celsius conversion section of the Weather application (Listing 2.2) were incorrect. The Weather.java source code has been updated to reflect the correct comments.

Source Files

• Divider.class
• Divider.java
• Investor.class
• Investor.java
• Variables.class
• Variables.java
• Weather.class
• Weather.java

Activities

• Solution 1: Investor.java and Investor.class.
• Solution 2: Divider.java and Divider.class.