11: FILES AND STREAMS in Java

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CHAPTER 11: FILES AND STREAMS
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111 Which of these can act both as the source of an input stream and as the destination of an output stream, based on the classes provided by the javaio package Select the four correct answers (a) (b) (c) (d) (e) 112 A file A network connection A pipe A string An array of chars
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Which of these statements about the constant named separator of the File class are true Select the two correct answers (a) (b) (c) (d) (e) The variable is of type char The variable is of type String It can be assumed that the value of the variable always is the character '/' It can be assumed that the value of the variable always is one of '/', '\' or ':' The separator can consist of more than one character
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Which one of these methods in the File class will return the name of the entry, excluding the specification of the directory in which it resides Select the one correct answer (a) getAbsolutePath() (b) getName() (c) getParent() (d) getPath() (e) None of the above
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What will the method length() in the class File return Select the one correct answer (a) (b) (c) (d) (e) The number of characters in the file The number of kilobytes in the file The number of lines in the file The number of words in the file None of the above
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Given the following program:
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import javaioFile; import javaioIOException; public final class Filing {
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113: BYTE STREAMS: INPUT STREAMS AND OUTPUT STREAMS public static void main (String[] args) throws IOException { File file = new File("/documents","/book//chapter1"); Systemoutprintln(filegetPath()); Systemoutprintln(filegetAbsolutePath()); Systemoutprintln(filegetCanonicalPath()); Systemoutprintln(filegetName()); Systemoutprintln(filegetParent()); } }
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Assume that the current or working directory has the absolute path "/wrk" Which lines below will not be included in the output from the program Select the two correct answers (a) /documents//book//chapter1 (b) /documents/book/chapter1 (c) /wrk//documents//book//chapter1 (d) /wrk/documents/book/chapter1 (e) /wrk/chapter1 (f) chapter1 (g) /documents//book/ 116 Given the following program:
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import javaioFile; public class ListingFiles { public static void main(String[] args) { File currentDirectory = new File(""); printFiles1(currentDirectory); printFiles2(currentDirectory); printFiles3(currentDirectory); } public static void printFiles1(File currentDirectory) { String[] entryNames = currentDirectorylist(); for (String entryName : entryNames) { Systemoutprintln(entryName); } } public static void printFiles2(File currentDirectory) { File[] entries = currentDirectorylistFiles(); for (File entry : entries) { Systemoutprintln(entry); } } public static void printFiles3(File currentDirectory) { File[] entries = currentDirectorylistFiles(); for (File entry : entries) { Systemoutprintln(entrygetPath()); } } }
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CHAPTER 11: FILES AND STREAMS
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Assume that the current or working directory has the absolute path "/wrk" and contains only one file with the name "ListingFilesclass" Which statement is true about the program Select the one correct answer (a) All three methods printFiles1(), printFiles2(), and printFiles3() will produce the same output (b) Only the methods printFiles1() and printFiles2(), will produce the same output (c) Only the methods printFiles2() and printFiles3(), will produce the same output (d) Only the methods printFiles1() and printFiles3(), will produce the same output (e) The program does not compile because the list() method does not exist in the File class 117 A file is readable but not writable on the file system of the host platform What will be the result of calling the method canWrite() on a File object representing this file Select the one correct answer (a) (b) (c) (d) (e) 118 A SecurityException is thrown The boolean value false is returned The boolean value true is returned The file is modified from being unwritable to being writable None of the above
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What is the type of the parameter given to the method renameTo() in the class File Select the one correct answer (a) File (b) FileDescriptor (c) FileNameFilter (d) String (e) char[]
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If write(0x01234567) is called on an instance of OutputStream, what will be written to the destination of the stream Select the one correct answer (a) (b) (c) (d) (e) The bytes 0x01, 0x23, 0x34, 0x45, and 0x67, in that order The bytes 0x67, 0x45, 0x34, 0x23, and 0x01, in that order The byte 0x01 The byte 0x67 None of the above
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