Validation of the input

I need to validate the inputs of the first name and lastname.

I think the clone portion is ok, but I don't know how to combine the last and firstname for the input information so it is easy to validate.

 public Clone() {

    }

}
class Person implements Cloneable{
    private String firstname;
    private String lastname;

    @Override
    public Object clone() {
        Person person = new Person();
        person.setFirstname(this.firstname);
        person.setLastname(this.lastname);
        return person;
    }

    public void setFirstname(String firstname){
            this.firstname = firstname;
    } 

    public void setLastname(String lastname){
        this.lastname=lastname;
    }
    public String getFirstname(){
        return firstname;
    }
    public String getLastname(){
        return lastname;
    }

    public static void Person(){

     String Fname ="";
       String Lname=""; 

      Scanner input2 = new Scanner(System.in);
      Scanner input3 = new Scanner(System.in);
       Person person = new Person();
       int i = 2;
       char c;
        /* This will take the values of first name
        and last name.
         */

       if (input2.nextLine().length()<=6) {  
      System.out.println("Enter your First Name:");
        Fname = input2.nextLine();}

     else  if (input2.nextLine().length()>6){
           throw new InputMismatchException();}

        System.out.println("Enter your Last Name");
        Lname =input3.nextLine();





        person.setFirstname(Fname);
        person.setLastname(Lname);

        /* This method will produce firs and last name
        also will produce the introduction.
        */
      Person cloned = (Person)person.clone();


      //** This method will print welcome to the world of Java.
       Introduction();

      System.out.println(cloned.getFirstname()+ " " + cloned.getLastname());

     System.out.println("*******************\n\n");


}