18. Files

Question 1

&laquo_space;is to * like&raquo_space; is to /, or is it vice versa?

Answer 1

Shifting left (<>) has the same effect as division.

Question 2

What is the value of each of the following expressions?

1. 16 & 8 & 4 & 2 & 1
2. 16 | 8 | 4 | 2 | 1

Answer 2

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Question 3

What possible values are given to the method(s) used for writing data? Bytes? Characters? Lines?

Answer 3

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Question 4

What result is returned by PrintWriter: checkError() instance method if something has gone wrong?

Answer 4

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Question 5

What does PrintWriter not have that PrintStream does? Is that something we want to generally use?

Answer 5

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Question 6

What is flushing and automatic flushing?

Answer 6

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Question 7

Is IOException a subclass Exception or RuntimeException? Is it a checked or unchecked exception Type?

Answer 7

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Question 8

What possible values are returned from the method used for reading data (InputStream)? Bytes? Characters? Lines? Some other value?

Answer 8

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Question 9

What possible values are returned from the instance method used for reading data? Bytes? Characters? Lines? Some other value? (InputStreamReader)

Answer 9

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Question 10

What possible values are returned from the method used for reading data? Bytes? Characters? Lines? Some other value? (BufferedReader)

Answer 10

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Question 11

What is the superclass of FileInputSteam class?

Answer 11

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Question 12

FileWriter class is merely a convenience for something. What?

Answer 12

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Question 13

How do we use the File class to check for the existence of a file?

Answer 13

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Question 14

In that order are bytes of a number written?

Answer 14

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Question 15

In what order are bytes of a number read?

Answer 15

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Question 16

The type of System.out and System.err is actually a subclass of OutputStream - which one?

Answer 16

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Question 17

System: err: OutputStream allows access to the standard input, as bytes or characters.

Answer 17

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Question 18

Does the System: in: InputStream allow access to the standard input, as bytes or characters?

Answer 18

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Question 19

Does System: out: OutputStream allow to access to the standard output as bytes, characters or both?

Answer 19

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Question 20

What is the significance of the associativity of the assignment operator? Is it left or right?

Answer 20

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Question 21

Under what circumstances is the finally block executed?

Answer 21

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Question 22

Why is it generally a good idea not to rely on initial values of variables? Which kinds of variables are we forced to initialize?

Answer 22

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