Give a description of the way that Input/Output is handled in Java. Your answer should include a comparison between the two sets of hierarchies of I/O streams: those based on InputStream and OutputStream, and those based on Reader and Writer.
Describe the technique of layering I/O streams. Give some code for a client to show how this technique could be used to read doubles from files that arrive over a TCP/IP network.
Give a piece of sample code to illustrate the way that exceptions are employed when reading text input from a file.
Explain why you would need an object wrapper to use an ArrayList with elements of type double. Give some code to show how elements are inserted and accessed.
A class representing an electronic wallet contains three methods
void debit(double amount)
void credit(double amount)
An object of this class is to be incorporated into a server so that the functionality can be accessed via a network.
If the system is based on sockets with a single connection between client and server, devise a protocol and explain the series of network transfers that take place if you wish to use the client to first check your balance and then credit by a certain amount.
If the balance is not allowed to become negative, what additional features must be added to your protocol when debiting the account?
Provide some code for the server side of this application.
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