DAT
Interface Lock

public interface Lock

Interface for a combination lock.

Method Summary

boolean	changeCombo(Combination oldCom, Combination newCom)
boolean	close() Close the lock.
boolean	open(Combination combo) If the combination is correct, open the lock.

Method Detail

open

public boolean open(Combination combo)

If the combination is correct, open the lock. (If it is already open there is no change.)

Parameters:

combo - the attempted combination

Returns:

true if the combination is correct, false otherwise

close

public boolean close()

Close the lock.

Returns:

true

changeCombo

public boolean changeCombo(Combination oldCom,
                           Combination newCom)

Parameters:

oldCom - the current combination

newCom - the combination to change to

Returns:

true if the old combination was correct (and hence the combination has been changed to the new one)