| << Chapter < Page | Chapter >> Page > |
| Figure 4 . Answer 13. |
|---|
Java3010rb.java:47: error: cannot find symbol
return (refToObj).getData();^
symbol: method getData()location: variable refToObj of type Object
1 error |
False. Every class that doesn't explicitly extend another class automatically extends the class named Object .
False. An anonymous object is an object whose reference is not saved in a named reference variable. An anonymous class is something entirely different.
True. Listing 2 shows an example of this syntax. (Note the use of the curly brackets in Listing 2 as opposed to the use of square brackets in Listing 1 .)
| Listing 2 . Answer 10. |
|---|
Object[] objRef = {new Java3010raMyClassA(randomNumber)}; |
False. Every array object contains a special property named length that contains the number of elements in an array. It is always possible todetermine the number of elements in an array object at runtime by accessing the value of the length property for the array object.
True.
False. The array structure that is encapsulated in an array object may have none, one, or more elements.
False. Unless code is written to do otherwise, the elements in a new array object are initialized with the standard default values for the types involved (zero, false , or null) .
False. When the declared type of an array is the type of an object (array object or ordinary object), references to the objects are stored in thearray elements and the objects actually exist elsewhere in memory.
True.
True.
True. Multidimensional arrays are created by creating tree structures of one-dimensional array objects.
False. The program produces the compiler error shown in Figure 2 .
| Figure 2 . Answer 1. |
|---|
Java3010ra.java:12: error: illegal start of expression
Object[]objRef = [new Java3010raMyClassA(randomNumber)];^
Java3010ra.java:12: error: ';' expectedObject[] objRef = [new Java3010raMyClassA(randomNumber)]; |
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.
I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
-end-
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