Question 1:

In Java, input/output is done using I/O streams. I/O streams are an abstraction. Explain what this means and why it is important.

Question 2:

Java has two types of I/O stream: character streams and byte streams. Why? What is the difference between the two types of streams?

Question 3:

What is a file? Why are files necessary?

Question 4:

What is the point of the following statement?

out = new PrintWriter( new FileWriter("data.dat") );

Why would you need a statement that involves two different stream classes, PrintWriter and FileWriter?

Question 5:

The package java.io includes a class named URL. What does an object of type URL represent, and how is it used?

Question 6:

What is the purpose of the JFileChooser class?

Question 7:

Explain what is meant by the client / server model of network communication.

Question 8:

What is a socket?

Question 9:

What is a ServerSocket and how is it used?

Question 10:

What is meant by an element in an XML document?

Question 11:

What is it about XML that makes it suitable for representing almost any type of data?

Question 12:

Write a complete program that will display the first ten lines from a text file. The lines should be written to standard output, System.out. The file name is given as the command-line argument args[0]. You can assume that the file contains at least ten lines. Don't bother to make the program robust. Do not use TextIO to process the file; read from the file using methods covered in this chapter.