java - Method is not working with reflection -

one of methods not working used both map , java reflection. not sure because of reflection or other reason working in other class didn't use reflection.

the method findaccessors() should retrieve value map2. method defined in class readedges. method called method findmethod() defined in class findmethod.

whenever call method findaccessors() method findmethod(), returning empty linked list instead of returning value map2. classes given below:

class readedges :

import java.io.bufferedreader; import java.io.chararrayreader; import java.io.ioexception; import java.util.arraylist; import java.util.hashmap; import java.util.linkedhashset; import java.util.linkedlist; import java.util.list; import java.util.map; import java.util.stringtokenizer; import java.util.regex.pattern;  import javax.swing.joptionpane;  public class readedges {     static dfsclass dfs = new dfsclass();     list<string> sourcenodes=new arraylist<string>();  // source node     list<string> destinationnodes=new arraylist<string>(); // destination node     linkedhashset<string> findtransitions=new linkedhashset<string>();     loanapprovalsystem ls = new loanapprovalsystem();     testdatageneration testdata = new testdatageneration();      private static final string edgepat = "([a-za-z]|[0-9])+(,|\\x20)([a-za-z]|[0-9])+";     private static final string start=dfs.getstart();     private static final string edge = dfs.getedge();     private static final string transitions=dfs.gettransitions();     public static string a;     public static string b;     public static string c;     public static string d;     private map<string, linkedhashset<string>> map = new hashmap();     private map<string, linkedhashset<string>> map2 = new hashmap();       public int getlinecount(string edge){          int count = edge.split("[\n|\r]").length;          //system.out.println(count);             return count;         }        public void addedge(string node1, string node2) throws ioexception{           linkedhashset<string> adjacent = map.get(node1);          {             if(adjacent==null) {                 adjacent = new linkedhashset();                 map.put(node1, adjacent);             }             adjacent.add(node2);                      }          }       public void addedgeandaccessor(string edge, string accessor) throws ioexception{          linkedhashset<string> adjacent2 = map2.get(edge);          {             if(adjacent2==null) {                 adjacent2 = new linkedhashset();                 map2.put(edge, adjacent2);                //system.out.println(map2);             }              adjacent2.add(accessor);             //system.out.println(map2);          }      }      public void readedge(string edgeinput,string transitionsinput,string accessorinput) throws invalidinputexception     {         char[] buf = edgeinput.tochararray();         bufferedreader br = new bufferedreader(new chararrayreader(buf));          char[] buf2 = transitionsinput.tochararray();         bufferedreader br2 = new bufferedreader(new chararrayreader(buf2));              string str2 = null;          char[] buf3 = accessorinput.tochararray();         bufferedreader br3 = new bufferedreader(new chararrayreader(buf3));              string str3 = null;          try          {             //a string next edge             string str = null;             //a stringtokinizer             stringtokenizer newnodes = null;             //get edges , set edges graph             while((((str = br.readline()) != null) && (str2 = br2.readline()) != null) && ((str3 = br3.readline()) != null))             {                 c=str;                 d=str2;                   linkedhashset<string> adjacent = map.get(str);                 if(adjacent==null) {                     adjacent = new linkedhashset();                     map.put(str, adjacent);                 }                 adjacent.add(str2);                  addedgeandaccessor(str,str3);                  //if edge inputs not in format, throw exception                 if(!pattern.matches(edgepat, str.trim()))                     joptionpane.showmessagedialog(null,"an invalid input '" + str + "' edge. please read notes above forms. ");                 //use comma separate tokens                 newnodes = new stringtokenizer (str, ", ");                 //get value of source node of edge                 string src = newnodes.nexttoken();                 //create source node , destination node                  string srcnode = src;                 string desnode = newnodes.nexttoken();                  a=srcnode;                 b=desnode;                   addedge(srcnode, desnode);                   //system.out.println(adjacent);                              //findtransition(a,b);                 //findaccessors(a,b);              }              //system.out.println(listoftransitions);         }             catch (ioexception e) {                 joptionpane.showmessagedialog(null, "something wrong!");                 e.printstacktrace();             } }       public linkedlist<string> adjacentnodes(string last) {         linkedhashset<string> adjacent = map.get(last);         if(adjacent==null) {             return new linkedlist();         }         return new linkedlist<string>(adjacent);      }      public linkedlist<string> findtransition(string node1, string node2) throws ioexception{              linkedhashset<string> adjacent = map.get(node1+" "+node2);             if(adjacent==null) {                 return new linkedlist();             }             findtransitions = adjacent;         return new linkedlist<string>(findtransitions);      }      public linkedlist<string> findaccessors(string node1, string node2) {         linkedhashset<string> adjacent = map2.get(node1+" "+node2);         if(adjacent==null) {             return new linkedlist();         }         system.out.println(adjacent);         return new linkedlist<string>(adjacent);      }  public string getsrcnode(){     return a; }  public string getedgeline(){     return c; }  public string gettransitionline(){     return d; }  } 

class findmethod :

import java.util.arraylist; import java.util.linkedlist; import java.lang.reflect.*;  public class findmethod {      readedges r = new readedges();     loanapprovalsystem ls = new loanapprovalsystem();     testdatageneration testdata = new testdatageneration();       int method1;     string method2;     boolean method3;     boolean method4;     string method5;     string m;       //returns method name using refletion     public string getmethod(method method){          findmethod fm = new findmethod();           m = method.getname();                    string str = "";                              str += m+"(" +fm.getparameter(method)+ ")";                // system.out.println(str);            return str;     }       //returns parameter name of method using refletion (i.e. (int))     public string getparameter(method method){          string str = "";         class<?>[] params = method.getparametertypes();          (int = 0; < params.length; i++) {              if (i > 0) {                  str += ", ";              }              str += (params[i].getsimplename());          }          return str;     }  public void findmethod(string s,string t,string transition) throws instantiationexception, illegalaccessexception, nosuchmethodexception, securityexception, illegalargumentexception, invocationtargetexception{          findmethod fm = new findmethod();           loanapprovalsystem cls = new loanapprovalsystem();         class<? extends loanapprovalsystem> c = cls.getclass();         object obj = c.newinstance();         method[] methods = loanapprovalsystem.class.getmethods();             for(method method : methods)           {               //returns method name (i.e. receive or asses)               m = method.getname();               fm.getmethod(method);           if(transition.equals(fm.getmethod(method)) && (transition.equals("receive(int)")) )         {             if(fm.getparameter(method).equals("int") )             {                 //ls.receive(testdata.testdata(s,t));                 //invoking method @ runtime m="receive".                  method = c.getmethod(m, int.class);                 method.invoke(obj,testdata.testdata(s,t));                  linkedlist<string> accessors= r.findaccessors(s,t);                 system.out.println("a:"+accessors);                  method1=ls.getamount();                  system.out.println(m+"("+method1+")");                 system.out.println("amount: "+method1);             }         }   }     }       public static void main(string[] args) throws instantiationexception, illegalaccessexception, nosuchmethodexception, securityexception, illegalargumentexception, invocationtargetexception      {          findmethod fm = new findmethod();          fm.findmethod("1","2","receive(int)");      }  } 

can please tell me why method findaccessors() not working within method findmethod()? or please give me solution of problem.

note: there class used in program loanapprovalsystem (). if need can give definition of class too.

it looks calling default constructor readedges:

'readedges r = new readedges();'

when need call constructor populates maps:

'readedges r = new readedges(edgeinput, transitionsinput, accessorinput);'

edit: function public void readedge(string edgeinput, string transitionsinput, string accessorinput); never being called.

you need remove void , add 's' readedge make constructor: public readedges(string edgeinput, string transitionsinput, string accessorinput);

then, when instantiate readedges in findmethod class, need supply arguments.

readedges r = new readedges(); should be: readedges r = new readedges(edgeinput, transitionsinput, accessorinput);

for more information, read 'constructor overloading' , 'method overloading'. http://beginnersbook.com/2013/05/constructor-overloading/