/**  * Write a description of class Person here.  
  * @author (your name)  
  * @version (a version number or a date) 
  */ 
 
 public class Person {     
     // the person's full name   
     private String name;     
     // the personal ID  
     private String id;   
     
     /**     
     * Constructor for objects of class Person  
     * @param fullName name of this person
     * @param personID ID of this person
     */    
     public Person(String fullName, String personID)     
     {         // initialise instance variables         
         name = fullName;  
         id = personID;     
     }  
     
     /**     
      * Return the full name of this person.   
      * @return name of person
      */     
     public String getName()  
     {        
         return name;     
     }       
          
     /** 
     * Set a new name for this person. 
     * @param replacementName new name for this person
     */  
    public void changeName(String replacementName)  
    {      
        name = replacementName;   
    }           
            
    /**   
    * Return the ID of this person.  
    * @return returns the ID of this person
    */   
    public String getPersonID()  
    {    
        return id;     
    }    
    
    /**
     * Change personal ID
     * @param id new personal ID
     */
    public void setPersonID(String id)
    {
        this.id = id;
    }
           
    /**   
    * Return the login name of this person. The login name is a combination   
    * of the first four characters of the person's name and the first three   
    * characters of the person's ID number.   
    * @return returns a string with this persons log-in ID
    */   
    public String getLoginName()  
    {     
        if(name.length() < 5)
        {
            System.out.println("Your name is too short. Your name needs to be at least 4 characters long.");
            return null;
        }
        else if(id.length() < 4)
        {
            System.out.println("Your ID is too short. It needs to be at least 3 characters long.");
            return null;
        }
        else
        {
            return name.substring(0,4) + id.substring(0,3);   
        }
    }       
            
    /**    
    * Print the person's name and ID to the terminal.   
    */ 
   public void print()  
   {    
       System.out.println("Full name: " + name + ", personal ID: " + id);              
   }    
}