Assignment of a college student (2)-first reply

Code Description: because the main you provide only has two places // expand here .............
I had to write a stupid one. I only added code in these two places, but I used Java. io. * And java. util. * Because you have already imported data in main, it should not be considered a violation .... The other two classes are not in // expand because you need to customize the class

Import java. Io .*;
Import java. util .*;

/**
* Exercise 29
*
*/
Public class main {

Public static void main (string ARGs []) throws ioexception {

// Read input file and build data structure in Model

Filereader reader = new filereader ("E: // input.txt ");
Bufferedreader breader = new bufferedreader (Reader );

String line = breader. Readline ();

While (line! = NULL) {// check for EOF
Try {
Stringtokenizer parsestring = new stringtokenizer (line );

String delimiters = "(),/T/N ";

String connectKeyword = parseString. nextToken (delimiters );
String nodeName = parseString. nextToken (delimiters );
String netName = parseString. nextToken (delimiters );

Node. getInstance (). addNodes (nodeName, netName );
Network. getInstance (). addNetworks (netName, nodeName );
// Expand here to build data structure .............
}

Catch (NoSuchElementException e ){
System. out. println ("Invalid input line:" + line
+ ". Skipping ....");
}

Line = bReader. readLine ();
}

// Allow user to query data structure
Options ();
}

/**
* Prompt users with options to either search for node, or network, or
* Quit
*/
Public static void options (){

Export keyboard = new partition (System. in );
System. out. println ("Which search do you require? ");
System. out
. Println ("1. networks-list all networks connected to a participant node ");
System. out
. Println ("2. nodes-list all the nodes connected to a participant network ");
System. out. println ("3. quit .");
System. out. println ();

While (keyboard. hasNext ()){
String s = keyboard. next ();
If (s. equals ("1 ")){
System. out. println ("please type a network name, all name is :");
System. out. println (Network. getInstance (). getAllNames ());
System. out. println ();
While (keyboard. hasNext ()){
String name = keyboard. next ();
If (Network. getInstance (). getNetworkByName (name) = null ){
System. out
. Println ("please type a network name, all name is :");
System. out. println (Network. getInstance (). getAllNames ());
System. out. println ();
} Else {
System. out. println (Network. getInstance ()
. GetNetworkByName (name ));
System. out. println ("Which search do you require? ");
System. out
. Println ("1. networks-list all networks connected to a participant node ");
System. out
. Println ("2. nodes-list all the nodes connected to a participant network ");
System. out. println ("3. quit .");
System. out. println ();
Break;
}
}
} Else if (s. equals ("2 ")){
System. Out. println ("please type A node name, all name is :");
System. Out. println (node. getinstance (). getallnames ());
While (keyboard. hasnext ()){
String name = keyboard. Next ();
If (node. getinstance (). getnodebyname (name) = NULL ){
System. Out
. Println ("please type A network name, all name is :");
System. Out. println (node. getinstance (). getallnames ());
System. Out. println ();
} Else {
System. Out. println (node. getinstance (). getnodebyname (
Name ));
System. Out. println ("which search do you require? ");
System. Out
. Println ("1. Networks-list all networks connected to a participant node ");
System. Out
. Println ("2. nodes-list all the nodes connected to a participant network ");
System. out. println ("3. quit .");
System. out. println ();
Break;
}
}
} Else if (s. equals ("3 ")){
System. out. println ("quit ");
System. out. println ();
System. exit (0 );
} Else {
System. out. println ("only 1, 2, 3 wocould be right ");
System. out. println ("Which search do you require? ");
System. out
. Println ("1. networks-list all networks connected to a participant node ");
System. out
. Println ("2. nodes-list all the nodes connected to a participant network ");
System. out. println ("3. quit .");
System. out. println ();
}

}
// Expand here .............

} // End options

Static class node {
Private hashtable <string, string> nodes = new hashtable <string, string> ();

Private Static node instance;

Private node (){
}

Public static node getinstance (){
If (instance = NULL ){
Instance = new node ();
}
Return instance;
}

Public String getnodebyname (string name ){
Return nodes. Get (name );
}

Public String getallnames (){
String names = "";
Try {
Enumeration <string> keys = nodes. Keys ();
While (Keys. hasmoreelements ()){
String key = keys. nextelement ();
Names + = Key + ",";
}
} Catch (exception e ){
E. printStackTrace ();
}
Return names. equals ("")? Names: names. substring (0,
Names. length ()-1 );
}

Public void addNodes (String nodeName, String netName ){
If (nodes. containsKey (nodeName )){
Nodes. put (nodeName, nodes. get (nodeName) + "," + netName );
} Else {
Nodes. put (nodeName, netName );
}

}

}

Static class Network {
Private Hashtable <String, String> networks = new Hashtable <String, String> ();

Private static Network instance;

Private Network (){
}

Public static Network getInstance (){
If (instance = null ){
Instance = new Network ();

}
Return instance;
}

Public String getnetworkbyname (string name ){
Return networks. Get (name );
}

Public String getallnames (){

String names = "";
Try {
Enumeration <string> keys = networks. Keys ();
While (Keys. hasmoreelements ()){

String key = keys. nextelement ();
Names + = Key + ",";
}
} Catch (exception e ){
E. printstacktrace ();
}
Return names. Equals ("")? Names: names. substring (0,
Names. Length ()-1 );
}

Public void addnetworks (string netname, string nodename ){
If (networks. containskey (netname )){
Networks. Put (netname, networks. Get (netname) + "," + nodename );
} Else {
Networks. put (netName, nodeName );
}

}
}
} // End class