Exam 19: Streams and Binary Inputoutput

Based on the code below, the statement that would move the file pointer to byte n counted from the beginning of the file is ___________________. RandomAccessFile test = new RandomAccessFile("record.bat", "r");

If we read a byte and the value represents an international character equal to 133 using an InputStream object, what is true about the int value we will read?

Assume we have a RandomAccessFile object, file, that stores a set of records of class MyData. The size of each record is MyData.RECORD_SIZE. Assume MyData has read and write methods both of which take a RandomAccessFile as an argument. Method write writes the object at the current location. Method read reads the record from current location of the file into the object. If we are currently at the beginning of the 1^st record, which code correctly modifies the 2^nd record by changing its color to Color.red through the setColor method?

If serializing object obj requires 12 bytes, how many bytes are required to serialize obj 3 times?

If you store information in binary form, as a sequence of bytes, you will use the ____ class(es) and their subclasses.

Which of the following statements enables you to write output to a text file?

Assume we have a RandomAccessFile object, file, which stores a set of records of class MyData, each needing MyData.RECORD_SIZE bytes for storage. Which expression calculates the number of records in the file?

Every object is assigned a serial number on the stream. What might be the result if the same object is saved twice?

In which package are most classes for file processing found?

A file pointer is a position in a random access file. Because files can be very large, The file pointer is of type _______.

Which is not a method available in the RandomAccessFile class?

Which file storage method is in human-readable form?

Objects are saved in ___________ format in object streams.

Which of these classes access sequences of characters? I readers II writers III streams

Objects saved to an object stream must belong to classes that:

Caesar cipher uses a shift of each character by a key with a value between 1 and 255. An a with a shift equal to 3 becomes a d. A z would become a c, wrapping around the alphabet. Which is the encryption of shadow for a key = 3?

Use a ____ object to access a file and move a file pointer.

How many bytes does the read method in the FileInputStream class actually return to the program call?

In Java, you use a(n) ____________ object to access a file and move its file pointer.

Streams access sequences of ____.