private boolean isDifferent(String key, Object value) {
        // Get the value from the properties Map for the specified key
        Object currentVal = properties.get(key);
        if (currentVal == null) {
            // If the currentVal is null, then test value against null
            return value != null;
        }
        else {
            // For non-null, need to use object.equals method
            return !currentVal.equals(value);
        }
    }
private boolean isDifferent ( String key , Object value ) { Object currentVal = properties . get ( key ) ; if ( currentVal == null ) { return value != null ; } else { return ! currentVal . equals ( value ) ; } }
Compare the specified value with that in the properties Map
This utility method is used from the set* methods to determine
if the value is being changed and hence the cache needs to be
cleared.

@param key The name of the property in the Map
@param value The value to be tested for equality
@return true if the values are different