package myapp; import org.exolab.castor.jdo.TimeStampable; public class Computer extends Product implements TimeStampable { private String _cpu; private long _timeStamp; public String getCpu() { return _cpu; } public void setCpu( String cpu ) { _cpu = cpu; } public void jdoSetTimeStamp( long timeStamp ) { _timeStamp = timeStamp; } public long jdoGetTimeStamp() { return _timeStamp; } public String toString() { return "<id: " + getId() + " name: " + getName() + " price: " + getPrice() + " cpu: " + _cpu + ">"; } }