Module 10 Quiz

After the following program is finished, how many bytes are written to the file t.dat? import java.io.*; public class Test { public static void main(String[] args) throwsIOException { DataOutputStream output = new DataOutputStream(new FileOutputStream("t.dat")); output.writeChars("ABCD"); output.close(); } }

8 bytes

Which of the following statements are true? A) All files are stored in binary format. So, all files are essentially binary files. B) Text I/O is built upon binary I/O to provide a level of abstraction for character encoding and decoding. C) Encoding and decoding are automatically performed by text I/O. D) For binary input, you need to know exactly how data were written in order to read them in correct type and order.

A B C D

Which of the following is the legal mode for creating a new RandomAccessFile stream? A) "w" B) 'r' C) "rw" D) "rwx"

C

To create a file, you can use __________. A) FileOutputStream B) FileWriter C) RandomAccessFile D) All of these

D

True/False: A compilation error will occur if the file doesn't exist when creating a FileInputStream for the file.

False

What type of exception occurs when creating a DataInputStream for a nonexistent file?

FileNotFoundException

True/False: Closing an OutputStream ensures that the data in the buffer are sent to the destination.

True

True/False: RandomAccessFile, DataInputStream, and DataOutputStream share the same file formats.

True

True/False: The FileWriter, FileReader, FileInputStream, FileOutputStream, and RandomAccessFile classes can be used to process external files.

True

To append data to an existing file, use _______ to construct a FileOutputStream for file out.dat.

new FileOutputStream("out.data", true)