Question
QUESTION 7 Suppose that b is a BagArray variable from Section 5.2, and consider these two possible statements: b.add(new Integer(42)); b.add(new Double(42.0)); Both statements compile
QUESTION 7
Suppose that b is a BagArray variable from Section 5.2, and consider these two possible statements:
b.add(new Integer(42));
b.add(new Double(42.0));
Both statements compile correctly. Select the true statement about what happens at run time:
A. Both statements will run with no errors, regardless of which one occurs first. | ||
B. The first statement will run okay, but after adding an Integer object to the bag, you can no longer add a Double object.
| ||
C. A run-time exception occurs with either statement. |
2 points
QUESTION 8
What is a primary difference between an array and a Vector from Java's Class Libraries:
A. Vectors can have more than one index. | ||
B. Vectors can have negative integers as indexes. | ||
C. Vectors can have positive double numbers as indexes. | ||
D. Vectors grow automatically as needed.
|
2 points
QUESTION 9
Suppose that x and y are reference variables and a program activates x.equals(y). What occurs if x is the null reference?
A. A NullPointerException occurs | ||
B. It always returns true. | ||
C. It always returns false. | ||
D. It returns true if y is also a null reference; otherwise it returns false. |
2 points
QUESTION 10
What is the primary purpose of an Iterator object?
A. To add new objects to a collection. | ||
B. To step through the objects of a collection one at a time. | ||
C. To play an audio clip. | ||
D. To display a graphical object |
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