java - Issues on cast Object to Integer or String -

i have implement interface iexecutable console menu application.the method implementing is: object execute(object o); display menu. read console menu option integer or string. on execution have error : java.lang.string cannot cast java.lang.integer question best way make conversion.

consolemenu.java

public object execute(object o) {         show();         o = read();         try{             int choice = integer.parseint((string) o); // error on line             iexecutable menuoption = getmenuoptions(choice);             if(menuoption != null){                 o = menuoption.execute(o);                 return o;             }               } catch(exception e){             system.out.println("invalid option"+ e.getmessage());                }          return null;     }  private static iexecutable getmenuoptions(int i){     for(menuoptions option :  options){         if(option.getkey() == && option.getisactive()){             return option;          }     }     return null; }  public static object read(){         string option = null;         bufferedreader buffer = new bufferedreader(new inputstreamreader(system.in));         try {                 option = buffer.readline();                 return option;              }          catch (ioexception e) {             system.out.println("ioexception " +e.getmessage());         }         return null;     } 

main.java

public class main {       public static void main(string[] args) {         integer = new integer(1);         consolemenu menu = new consolemenu("math operations");         menu.addmenuoption(new suboption());         menu.addmenuoption(new addoption());         = (integer) menu.execute(i);      }  } 

i read console menu option integer or string

if user can either input 3 or x menu option, should not parse value integer.

if have code menuoptions, change key property string not integer. if not, quick fix may needed

private static iexecutable getmenuoptions(string i){      for(menuoptions option :  options){         if(i.equals(option.getkey()+"")) && option.getisactive()){             return option;         }     }     return null; } 

which may called

iexecutable menuoption = getmenuoptions((string) o);