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ch25a.html
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<title>Java 8 Programmer II Study Guide: Exam 1Z0-809</title>
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<h1><i class="chapter">Chapter TWENTY-FIVE</i><br />
Files and Streams</h1>
<p><br /></p>
<h3 style="text-align: center;"><i>Exam Objectives</i></h3>
<p style="text-align: center;"><i>Use Stream API with NIO.2.</i><br /></p>
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<h2>Answers</h2>
<p><b>1. The correct answer is A.</b><br /> A value of zero for the <code>maxDepth</code> argument means that only the starting directory is visited (no files or subdirectories).</p>
<p><br /></p>
<p><b>2. The correct answer is D.</b><br /> Option A is false. <code>Files.find()</code> doesn't have a default subdirectory depth. This is passed as an argument to the method.<br /> Option B is false. <code>Files.find()</code> follows symbolic links only if <code>FileVisitOption.FOLLOW_LINKS</code> is passed as an argument.<br /> Option C is false. <code>Files.walk()</code> follows symbolic links only if <code>FileVisitOption.FOLLOW_LINKS</code> is passed as an argument.<br /> Option D is true. <code>Files.walk()</code> traverses subdirectories recursively.</p>
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<p><b>3. The correct answer is D.</b><br /> Option A is not equivalent. <code>Files.list()</code> doesn't traverse subdirectories recursively.<br /> Option B is not equivalent. <code>Files.find()</code> is missing the max depth argument.<br /> Option C is not equivalent. The last argument must be a <code>BiPredicate</code>.</p>
<p><br /></p>
<p><b>4. The correct answer is C.</b><br /> If the file doesn't exist, <code>Files.line(Path)</code> throws an <code>IOException</code> (a <code>java.nio.file.NoSuchFileException</code>) when the method is called, before the stream is created.</p>
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