how to make an virtual chat bot in java? -

i want make chat bot in java don't know how start? i've tried following code not need. in program had write every possibilities of questions. if 1 have solution please me.

import java.io.*;  public class chatbot  { public static void main(string[]args) throws ioexception {     string hel = new string("hello");     string hel1 = new string("hello");     string hel2 = new string("hello");     string hel3 = new string("hii");     string hel4 = new string("hiii");     string hel5 = new string("hii");     string hel6 = new string("hiii");      bufferedreader br = new bufferedreader(new inputstreamreader(system.in));         system.out.println("what name?");         string name = br.readline();         system.out.println("hello "+name+"..");         string hellorep = br.readline();         if(hellorep .equals(hel))         {             system.out.println("hello there...");         }         else if(hellorep .equals(hel1))         {             system.out.println("hello there...");         }         else if(hellorep .equals(hel2))         {             system.out.println("hello there...");         }         else if(hellorep .equals(hel3))         {             system.out.println("hii");         }         else if(hellorep .equals(hel4))         {             system.out.println("hiii");         }         else if(hellorep .equals(hel5))         {             system.out.println("hii");         }         else if(hellorep .equals(hel6))         {             system.out.println("hiii");         }         else         {             system.out.println("please type again didn't you..");         }     } } 

if want make window can use jtextfield , add actionlistener , if want make console use input

then message aka store in variable , in respond method

if(stringvariablename.contains("your word want check if contains")) { make bot respond console or jtextfieldname.settext("answer here") }

and add many response possibilities doing else if after if this

if(){ } else if(stringvariablename.contains("")){ }

you can many times want , there have chat bot :d