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Once you've worked through the Exam Cram, have read the supplementary ma-terials as needed, and have taken the practice test, you'll have a pretty clear idea of when you should be ready to take the real exam. The practice test included in this book is considered slightly harder than the real one. We strongly recommend that you keep practicing until your scores top the 70 percent mark; 75 percent would be a good goal, to give yourself some margin for error in a real exam situation (where stress will play more of a role than when you practice). Once you hit that point, you should be ready to go. But if you get through the practice exam in this book without attaining that score, you should keep taking the practice test and studying the materials until you get there.
The total installation file is over 20MB, but you can download it in pieces if necessary. It takes a huge amount of disk space to install—over 65MB after you have the installation file downloaded, so clean out your hard disk. You can also download the JDK documentation, which is very complete but also very bulky.
Naturally, you should practice with the questions at the end of each chapter and the practice test in Chapter 15. There are also a fair number of Web sites devoted to preparation for the Java 2 programmer certification exam. I've listed some in the "Just the FAQs" section later in this chapter, but more will probably appear, so try a Web search engine.
Finally, I will be maintaining and adding to the mock exam at www.lanw.com/ java/javacert. I used this practice test to evaluate sample questions for this book and to locate topics that most new Java programmers have a hard time with.
There will be scratch paper or an erasable plastic sheet with a felt tip marker. You can use this to write down key information; however, you are not allowed to take any notes out of the exam. If there is any topic you have a hard time remembering, you might want to scan the Cram Sheet from the front of this book just before taking the test and then make a few quick notes when you get into the testing room.
The computer will be a pretty typical system with mouse and keyboard. The initial screen gives you the option to run a quick tutorial test. If you have never taken one of these tests before, you should take the tutorial. The real test timer does not start until you have specifically chosen to start the real test.
Here is a sample multiple-choice question that requires you to select a single correct answer. Following the question is a brief summary of each potential answer and why it is either right or wrong.
Here are some statements about the java.lang.System class. Which of the following statements is correct?
Answer d is correct. The System.exit method takes an int primitive value that can be used as an error code returned to the operating system (OS). Answer a is incorrect because the System.err print stream is automatically created by the Java Virtual Machine ( JVM). Answer b is incorrect because there is no System.timer method and the System method that does return the time is precise only to the millisecond. Answer c is incorrect because System.arraycopy works with both primitive and reference arrays.
Let's examine a question that requires choosing multiple answers. This type of question provides checkboxes rather than radio buttons for marking all appropriate selections.
Which of the following statements about the java.util.Vector and java. util.Hashtable classes are correct? [Check all correct answers]