Java in 21 Days (7th Edition) Day 18: Accessing Databases with JDBC 4.2 and Derby

The cover of Teach Yourself Java in 21 Days (7th Edition) by Rogers Cadenhead

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Notes and Corrections

  • View the Certification Practice quiz solution
  • Certification answer: Answer (a) is correct. The compiler fails with the error message "non-static variable count cannot be referenced from a static context."

    Answer (b) is incorrect. You can use the new operator along with the constructor method of a class anywhere an object of that class would be expected.

    Answer (c) is incorrect. The [] that is used to declare an array can be placed after the variable name instead of the class or data type.

    Answer (d) is incorrect. Class variables can be declared anywhere outside of the methods of a class, not just at the top of the class definition.

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