Go-Back-N Java程序,真正的好东西.docxVIP

国外教材 《计算机网络》Go-Back-N Java程序，形象生动，学习效果很好。/* * This Go Back N Applet was designed to be used in conjunction with * Computer Networking: A Top Down Approach * by James Kurose Keith Ross. * Terminology and specifications are based upon their description of the * Go Back N protocol in chapter 3, section 4. * * Original Applet coded by Shamiul Azom as project assigned by * Prof. Martin Reisslein, Arizona State University * Course No. EEE-459/591. Spring 2001 * * Applet significantly revised by Matthew Shatley and Chris Hoffman * for Professor Paul D. Amer (amer@udel.edu) * University of Delaware (2008) * * Applet updated Feb. 2012 by Chris Hoffman to fix GoBackN text output * to reflect the single timer implementation of Go Back N, as outlined * on pg 234 in the 5th edition of the aforementioned text. * * A note on magic numbers: Magic numbers are horrible to have in your code in general. * However, the graphics components of this applet provided no good way to remove the * magic numbers from the code as locations for objects are specified in pixel coordinates. * We apologize in advance for any confusion this may cause in reading the code. */import java.applet.Applet;import java.awt.*;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;public class GBN extends Applet implements ActionListener, Runnable { private static final int ADVANCE_PACKET = 5; // Default values of parameters for animation // sender_window_len_def the sender can have a maximum of 5 outstanding // un-acknowledged packets final int sender_window_len_def = 5; // how many packets the receiver can hold in memory without delivering data // in the case of GBN we can hold 1(or the current packet) in memory // if another packet arrives the one in memory is discarded final int receiver_window_len = 1; // GUI components to describe how the Simulation should be drawn final int pack_width_def = 10; final int pack_height_def = 30; final