/**
 * Write a description of class PhoneNumber here.
 *
 * @author Jeff Pittges
 * @version 8-MAR-2007
 */
public class PhoneNumber
{
        // instance variables
        private int areaCode = 0;
        private int exchange = 0;
        private int extension = 0;

        /**
         * Constructor for objects of class PhoneNumber
         */
        public PhoneNumber(int _areaCode, int _exc, int _ext)
        {
                // initialise instance variables
                this.areaCode  = _areaCode;
                this.exchange  = _exc;
                this.extension = _ext;
        }
       
        void setAreaCode(int newAreaCode)
        {
            this.areaCode = newAreaCode;
        }
       
        int getAreaCode()
        {
            return this.areaCode;
        }
       
        void setExchange(int newExchange)
        {
            this.exchange = newExchange;
        }
       
        int getExchange()
        {
            return this.exchange;
        }
       
        void setExtension(int newExt)
        {
            this.extension = newExt;
        }
       
        int getExtension()
        {
            return this.extension;
        }


        public void copyFrom(PhoneNumber pnum)
        {
                this.setAreaCode(pnum.getAreaCode());
                this.setExchange(pnum.getExchange());
                this.setExtension(pnum.getExtension());
               
        }
       
        public void swap(PhoneNumber pnum)
        {
            PhoneNumber tmp = new PhoneNumber(555, 555, 1212);
           
            tmp.copyFrom(this);
            this.copyFrom(pnum);
            pnum.copyFrom(tmp);
           
        }
}