Heap Memory And References
This is a "friendly quiz" with some multiple choice questions about heap memory, references, NullPointerExceptions, etc. If you choose an incorrect answer you have the option to view the correct answer. Also, you can hit your browser's "back" button to go back to the previous page and retake the question (this seems to work for all the questions except the last one).
- 1.Heap memory is used to
- A.
Store the machine language code corresponding to the the program itself
- B.
Store objects
- C.
Store things that are no longer needed
- 2.From the following DrJava interactions what can you infer about p? > p [email protected]
- A.
It is either null or pointing to a Widget
- B.
Nothing - base 16 numbers freak me out
- C.
It is pointing to a Widget stored at heap address 7ef48b2 (a base-16 number)
- 3.A NullPointerException causes a program to crash. It occurs when
- A.
A program runs out of memory.
- B.
The left operand of a dot operator is null.
- C.
A reference variable is pointing to an object of the wrong type.
- 4.
![Choose the one true statement about the code below. - ProProfs]( "Choose the one true statement about the code below.")
Choose the one true statement about the code below.- A.
Method2() can not change the Counter pointed to by c because it's out of scope
- B.
Method2() can change the Counter pointed to by c because it's known by all methods within the class.
- C.
Method2() can change the Counter pointed to by c because method2() is given its heap address
- 5.Given the following code, choose the one true statement. public class A { private B b; }
- A.
A "is a" B
- B.
A "wannabe" B
- C.
A "has a" B
Questions: 10 | Attempts: 5327 | Last updated: May 27, 2021
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Sample QuestionIntegrated Circuit Technology, Inc. ('ICT') was having difficulty finding qualified engineers to work in its expanding production facilities because the hardware needed to train top-flight engineering students was so expensive that most colleges could not afford to purchase more than a minimal amount of such equipment, which limited program sizes and held down the number of applicable engineering degree candidates. ICT's chief executive officer, Cruz, wrote the following letter to the heads of several universities: If you will commit your institution to accepting in your engineering degree program every junior-year undergraduate who wishes to pursue that major, ICT will provide your institution with all the necessary electronic hardware to instruct such students. Our engineers have informed me that one set of equipment (i.e., one each of every machine used by ICT in its production process) is sufficient for use by five students; therefore, for every five engineering degree majors you accept in excess of your current engineering degree population, ICT will provide one such set of equipment. Jackson, chancellor of Seaport College of Engineering ('SCE'), also received a letter from Cruz. The ICT letter arrived during SCE's annual budget review process, and Jackson was called upon to decide how much of the college's limited funds to apply to engineering equipment purchases. The day that she received Cruz's letter, Jackson informed the budget committee that no funds would be needed from that year's budget for engineering equipment purchases. A few days later, as Jackson was dictating the acceptance letter to ICT, she received a second letter from Cruz indicating that the ICT equipment program was being canceled due to an influx of qualified foreign engineers to the United States. Because the budget had been approved and all available funds had been committed to nonengineering equipment purchases, Jackson mailed the acceptance letter anyway and it was delivered to Cruz at ICT. If SCE brings a breach of contract action against ICT, what result?
Questions: 33 | Attempts: 2681 | Last updated: Apr 28, 2021
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