opacity property
final
        The target opacity.
An opacity of 1.0 is fully opaque. An opacity of 0.0 is fully transparent (i.e., invisible).
The opacity must not be null.
Implementation
final double opacity
The target opacity.
An opacity of 1.0 is fully opaque. An opacity of 0.0 is fully transparent (i.e., invisible).
The opacity must not be null.
final double opacity