15d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffinpackage coffee; 25d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffin 35d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffininterface Heater { 45d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffin void on(); 55d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffin void off(); 65d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffin boolean isHot(); 75d3207ac2713386ed61c6ca8f0356e8f093a62e1Paul Duffin} 8