Exam 13: File Input and Output

A(n) ____ is a holding place for bytes that are waiting to be read or written.

Java's Path class is used to create objects that contain information about files and directories, while the Files class performs operations on files and directories.

import java.nio.file.*; public class PathDemo {     public static void main(String[] args)     {         Path filePath = Paths.get("C:\\Java\\Input.Output\\LessonInfo.txt");         int count = filePath.getNameCount();         System.out.println("Path is " + filePath.toString());         System.out.println("File name is " +           filePath.getFileName());         System.out.println("There are " + count +           " elements in the file path");         for(int x = 0; x             System.out.println("Element " + x + " is " +             filePath.getName(x));     } } The above code demonstrates the creation of a Path and its method. Describe the output that will display when the code is executed.

The true benefit of using a(n) ____ file is the ability to retrieve a specific record from a file directly, without reading through other records to locate the desired one.

If you simply want to display records in order based on their key field, you need to create a random access file.

When a String is written, placing each record on a new line makes the output file easier to read and interpret. Since not all platforms use '\n' to separate lines, the BufferedWriter class has two alternatives: the newLine() method and the System.getProperty() method. Describe these two methods and how they operate.

while(nextLine = reader.readLine() != null)     System.out.println(nextLine); The above loop could be used to read multiple lines from a file. Explain how this loop will execute.

writer.write(names, 0, names.length()); The above code represents a write() method of the BufferedWriter class. Describe the purpose of the method and how it accepts the String characters.

The BufferedWriter class contains a ____ method that uses the current platform's line separator.

import java.nio.file.*; import static java.nio.file.AccessMode.*; import java.io.IOException; public class PathDemo3 {   public static void main(String[] args)   {     Path myFile = Paths.get("C:\\Java\\Chapter.13\\Data.txt");     System.out.println("Path is " + myFile.toString());     try     {       -------------- Code here -------------------       System.out.println("File can be read and executed");     }     catch(IOException e)     {        System.out.println("File cannot be used for this application");     }    } } Assuming you have declared a path named myFile , create the checkAccess() method on the indicated line that will verify that the file exists, and checks that the program can read and write to the file.

import java.nio.file.*; import java.io.*; import static java.nio.file.StandardOpenOption.*; public class WriteFile {    public static void main(String[] args)    {       Path myFile = Paths.get("C:\\Java\\Input.Output\\myNumbers.txt");       String nums = "12345";       byte[] data = nums.getBytes();       OutputStream output = null;       try      {        -----Code here------        output.write(data)        output.flush();        output.close();      }      catch(Exception badNums)      {          System.out.println("My numbers: " + badNums);      }   } } Using the above code, add a statement on the indicated line that will create a writeable file by constructing a BufferedOutputStream object and assigning it to the OutputStream . No output should appear on the monitor, but a file should be created.

Describe and provide an example of the differences between real-time applications and interactive programs.

A ____ is a group of characters that has some meaning.

Placing a file in the ____ directory of your storage device is equivalent to tossing a loose document into a drawer.

The ____ method returns the last Path element in a list of pathnames.

The String class ____ method accepts an argument that identifies the field delimiter and returns an array of String s.

When you use the BufferedReader class, you must import the ____ package into your program.

Explain the difference between an absolute path and a relative path. Provide an example of an absolute path to a file on a system, and then provide an example of a relative path.

Provide an example of batch processing.

A(n) ____ field is the field in a record that makes the record unique from all others.