java - Override clone in abstract superclass -

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i'm bit new java please bear me :)

i've created superclass.

public abstract class employee 

i try override object clone doing following

    @override     public employee clone()     {         employee foo;          try         {             foo = (employee) super.clone();         }         catch (clonenotsupportedexception e)         {             throw new assertionerror(e);         }          return foo;     } 

i've created subclass

public class employee_subclass extends employee 

with constructor.

above have main program.

from main program i'm trying clone object of employee_subclass, unsuccessfully.

is possible clone object of subclass clone function in superclass?

i keep getting assertionerror thrown @ me

    exception in thread "main" java.lang.assertionerror: java.lang.clonenotsupportedexception: test_project.employee_subclass     @ test_project.employee.clone(employee.java:108)     @ test_project.test_project.main(test_project.java:22) caused by: java.lang.clonenotsupportedexception: test_project.employee_subclass     @ java.lang.object.clone(native method)     @ test_project.employee.clone(employee.java:104)     ... 1 more java result: 1 

any idea how can correctly?

thanks.

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ok added clonable, have

    public abstract class employee implements cloneable      {         private string firstname;         private string lastname;         private string socialsecuritynumber;         private date_of_birth date_of_birth_inst;          // three-argument constructor         public employee( string first, string last, string ssn, int day,                               int month, int year )         {              firstname = first;              lastname = last;              socialsecuritynumber = ssn;              date_of_birth_inst = new date_of_birth(day, month, year);         }           ....         , set functions.         ....          @override         protected employee clone() throws clonenotsupportedexception {             employee clone = (employee) super.clone();             return clone;         }    } 

here subclass

public class employee_subclass extends employee{      public employee_subclass( string first, string last, string ssn, int day,                           int month, int year )     {             super( first, last, ssn, day, month, year);         }  } 

only constructor.

and here main file.

public class test_project {      /**      * @param args command line arguments      */     public static void main(string[] args) throws clonenotsupportedexception {          employee_subclass employee_inst = new employee_subclass("hello", "world",                                                    "066499402", 7, 6, 1984);          employee_subclass employee_inst1;          employee_inst1 = (employee_subclass) employee_inst.clone();     }          } 

i had add throws clonenotsupportedexception otherwise wouldn't work.

so question how works?

when call employee_inst.clone(), calls clone function in employee, right?

now, function return object of employee, how can insert subclass object?

and deep clone, did correctly? date_of_birth_inst, copied correctly?

thanks lot.

you forgot make employee class implement cloneable.