オブジェクト指向、エンジンのたとえ
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import java.util.*; interface Engine { public void boot(); public void stop(); } class EngineFigurative implements Engine { private String maker; public EngineFigurative(String maker) { this.maker = maker; } public String getMaker() { return this.maker; } public void boot() { System.out.println(this.maker + " boot()"); } public void stop() { System.out.println(this.maker + " stop()"); } } class EngineFactory { public Engine generate(String maker) { Engine engine = new EngineFigurative(maker); return engine; } } class EngineHandler { public void bootAll(List<Engine> engines) { for (Engine engine : engines) { engine.boot(); } } public void stopAll(List<Engine> engines) { for (Engine engine : engines) { engine.stop(); } } } public class Main { public static void main(String[] args) throws Exception { EngineFactory ef = new EngineFactory(); EngineHandler eh = new EngineHandler(); List<Engine> engineList = new ArrayList<>(); engineList.add(ef.generate("ホンダ")); engineList.add(ef.generate("Nissan")); engineList.add(ef.generate("TOYOTA")); eh.bootAll(engineList); eh.stopAll(engineList); } } |
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ホンダ boot() Nissan boot() TOYOTA boot() ホンダ stop() Nissan stop() TOYOTA stop() |
