visual basic barcode program The Art of Java in Java

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The Art of Java
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The path-removal method finds the following solutions:
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From New York To Los Angeles New York to Chicago to Denver to Los Angeles Distance is 2900 New York to Toronto to Los Angeles Distance is 3000 New York to Denver to Houston to Los Angeles Distance is 4300
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The search found the three solutions. Notice, however, that none are the best solution.
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Node Removal
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The second way to force the generation of additional solutions, node removal, simply removes the last node in the current solution path and tries again. To do this, main( ) is changed so that it removes the last connection from the flight database, clears all the skip fields, and obtains a new, empty stack that is used to hold the next solution. The last connection of the previous solution is removed from the flight database by using a new method called remove( ). All the skip fields are reset by using another new method called resetAllSkip( ). The updated main( ) method, along with resetAllSkip( ) and remove( ), are shown here:
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public static void main(String args[]) { String to, from; NodeR ob = new NodeR(); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); boolean done = false; FlightInfo f; ob.setup(); try { System.out.print("From "); from = br.readLine(); System.out.print("To "); to = br.readLine(); do { ob.isflight(from, to); if(ob.btStack.size() == 0) done = true; else { // Save the flight on top-of-stack. f = (FlightInfo) ob.btStack.peek();
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ob.route(to); // display current route ob.resetAllSkip(); // reset all skip fields /* Remove last flight in previous route from the flight database. */ ob.remove(f); // Reset the backtrack stack. ob.btStack = new Stack(); } } while(!done); } catch (IOException exc) { System.out.println("Error on input."); } } // Reset all skip fields. void resetAllSkip() { for(int i=0; i< numFlights; i++) flights[i].skip = false; } // Remove a connection. void remove(FlightInfo f) { for(int i=0; i< numFlights; i++) if(flights[i].from.equals(f.from) && flights[i].to.equals(f.to)) flights[i].from = ""; }
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As you can see, removing a connection is accomplished by assigning a zero-length string to the name of the departure city. Because so many changes are required, the entire node-removal program is shown here for the sake of clarity:
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// Find multiple connections using node removal. import java.util.*; import java.io.*; // Flight information. class FlightInfo { String from; String to; int distance;
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boolean skip; // used in backtracking FlightInfo(String f, String t, int d) { from = f; to = t; distance = d; skip = false; } } class NodeR { final int MAX = 100; // This array holds the flight information. FlightInfo flights[] = new FlightInfo[MAX]; int numFlights = 0; // number of entries in flight array Stack btStack = new Stack(); // backtrack stack public static void main(String args[]) { String to, from; NodeR ob = new NodeR(); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); boolean done = false; FlightInfo f; ob.setup(); try { System.out.print("From "); from = br.readLine(); System.out.print("To "); to = br.readLine(); do { ob.isflight(from, to); if(ob.btStack.size() == 0) done = true; else { // Save the flight on top-of-stack. f = (FlightInfo) ob.btStack.peek();
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ob.route(to); // display current route ob.resetAllSkip(); // reset all skip fields /* Remove last flight in previous route from the flight database. */ ob.remove(f); // Reset the backtrack stack. ob.btStack = new Stack(); } } while(!done); } catch (IOException exc) { System.out.println("Error on input."); } } // Initialize the flight database. void setup() { addFlight("New York", "Chicago", 900); addFlight("Chicago", "Denver", 1000); addFlight("New York", "Toronto", 500); addFlight("New York", "Denver", 1800); addFlight("Toronto", "Calgary", 1700); addFlight("Toronto", "Los Angeles", 2500); addFlight("Toronto", "Chicago", 500); addFlight("Denver", "Urbana", 1000); addFlight("Denver", "Houston", 1000); addFlight("Houston", "Los Angeles", 1500); addFlight("Denver", "Los Angeles", 1000); } // Put flights into the database. void addFlight(String from, String to, int dist) { if(numFlights < MAX) { flights[numFlights] = new FlightInfo(from, to, dist); numFlights++; } else System.out.println("Flight database full.\n"); }
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