9 If a sequential file is opened for input then this allows

9.

If a sequential file is opened for input, then this allows data to be placed into the file by the Java application.

            (a)     True        (b)     False

(10)    Which of the terms in the following line of code are named variables that could be          replaced as long as all other references were also updated?

                        FileReader in = new FileReader(inFile);

            (a) inFile     (b) in              (c) new                 (d) File         (e) FileReader

Considering the following class file, answer each of the questions given below.

import java.io.*; import java.io.FileReader;

import java.io.FileWriter;

public class ReadWrite {

public static void main(String[] args) throws IOException {

   

    File inputFile = new File(\"inData.txt\");

    File outputFile = new File(\"outData.txt\");

    FileReader in = new FileReader(inputFile);

    FileWriter out = new FileWriter(outputFile, true);

    int c;

    while ((c = in.read()) != -1)

      out.write(c);

    in.close();

    out.close();

}

     }

(11)    in is a FileWriter object.                                                  (a) True (b) False

(12)    out is a FileReader object.                                                            (a) True (b) False

(13)    inputFile is a File object associated with outData.txt .          (a) True (b) False

(14)    outputFile is a File object linked with inData.txt .   (a) True (b) False

(15)    out.close() is outside the block of the while loop.                      (a) True (b) False

(16)    in.close() is inside the block of the while loop.              (a) True (b) False

(17)    The while loop is used to both read from and write to the file. (a) True (b) False

(18)    (c = in.read()) != -1 is true when data can still be read. (a) True (b) False

(19)    The loop condition is false when the end of file marker is reached.          (a) True (b) False

(20)    FileWriter(outputFile, true) allows for appending.            (a) True (b) False

           

import java.io.*; import java.io.FileReader; import java.io.FileWriter; public class ReadWrite { public static void main(String[] args) throws IOException {         File inputFile = new File(\"inData.txt\");     File outputFile = new File(\"outData.txt\");     FileReader in = new FileReader(inputFile);     FileWriter out = new FileWriter(outputFile, true);     int c;     while ((c = in.read()) != -1)       out.write(c);     in.close();     out.close(); }      }

Solution

(9)----------(b) False

10-------------(a) inFile

11-------------(a) True

12-------------(a) True

13-------------(b) False

14---------------(b) False

15---------------(a) True

16---------------(b) False

17----------------(a) True

18----------------(b) False

19-----------------(b) False

20------------------(a) True