Questions and Answers of An Introduction To Network Programming

Using a text editor or word processor, create a text file holding a series of surnames and payroll numbers (at least five of each). For example:Now write a Java program that uses a while loop to read
Modify the above code to use the alternative method for multithreading (i.e., implementing the Runnable interface). Name your main class RunnableHelloBye and your subsidiary classes Hello and Goodbye
Take a copy of the above program, rename the class and modify the appropriate line so that the program accepts input from the standard input stream (i.e., using a Scanner around the standard input
Write a (very short) program that creates a serial text file holding just two or three names of your own choosing. After compiling and running the program, use the MS-DOS command type (or the
Making use of class Results shown below, repeat the above program, this time writing/reading objects of class Result. (When displaying the names and marks that have been read, of course, you must
(i) Write a program to display the stock code, unit price and current level for all items in table Stock. (ii) Modify the above code to display description, current level and reorder level for all
Take a backup of your database. Then create a program (using SQL strings) that will insert one record, increase by 10 % the unit price of each item of stock and delete one record with specified stock
Write a simple GUI-driven program that will allow the user to retrieve the current stock level of any item whose stock code he/she enters (repeatedly, for as many items as the user wishes).
(i) Modify the above Web page and servlet so that the POST method is used to send both the user’s name and his/her email address. The Web page returned should display the user’s email address
Extend the above application to cater for selection of bananas, as well as apples and pears.
Compile ImageServer.java and ImageClient.java from the first example in this chapter. Make sure that file beesting.jpg is accessible to the server and then run this application.Example:This example
Modify MediaClient.java so that it creates an ImageIcon from the byte array received from the server and then uses a JLabel to display the image received. Compile the source code for the two program
Modify the code for SimpleSound.java so that the user can specify the number of ‘cuckoos’ when ‘play’ is pressed. (For separate chimes, you will need to insert an empty delay loop with a very
(i) Compile and run the MediaPlayer program from the end of the chapter, experimenting with the video and sound files supplied on the CD-ROM. (ii) Modify the above program so that the user can
Create an applet with a single button that holds an image. (Use the JButton constructor that takes an ImageIcon as its single argument.) Whenever the button/image is pressed a single ‘cuckoo’
Specifying an area of size 300 pixels × 300 pixels in your HTML file, create an applet that holds an image that is positioned and scaled so that it occupies an area 40 pixels in from each side of
Create an applet that displays a simple drawing of a house.
This exercise converts the above files into a simple email server and email client respectively. The server conversion has been done for you and is contained in file EmailServer.java, a printed
If you haven’t already done so, compile programs TCPEchoServer and TCPEchoClient from Sect. 2.2.1 and then run them as described at the end of that section.Sect. 2.2.1A communication link created