Java का Adapter Pattern

public class Main {
	interface Target { void request(); }
	static class Adaptee { void specificRequest() { System.out.println("Adaptee's own method"); } }
	static class Adapter implements Target {
		Adaptee adaptee = new Adaptee();
		public void request() { adaptee.specificRequest(); } // translates one interface to another
	}
	public static void main(String[] args) {
		Target t = new Adapter();
		t.request();
	}
}

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public class Main {
	static class Adaptee { void specific() { System.out.println("specific()"); } }
	interface Target { void request(); }
	static class ObjectAdapter implements Target { // composition -- holds a reference
		Adaptee adaptee = new Adaptee();
		public void request() { adaptee.specific(); }
	}
	public static void main(String[] args) {
		new ObjectAdapter().request(); // Java favors this over class-adapter inheritance
	}
}

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public class Main {
	static class LegacyPrinter { void oldPrint(String s) { System.out.println("Legacy: " + s); } }
	interface ModernPrinter { void print(String s); }
	static class PrinterAdapter implements ModernPrinter {
		LegacyPrinter legacy = new LegacyPrinter();
		public void print(String s) { legacy.oldPrint(s); } // isolates the mismatch here
	}
	public static void main(String[] args) {
		ModernPrinter p = new PrinterAdapter();
		p.print("Hello");
	}
}

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public class Main {
	interface TemperatureReader { double celsius(); }
	static class FahrenheitSensor { double readFahrenheit() { return 98.6; } }
	static class TemperatureAdapter implements TemperatureReader {
		FahrenheitSensor sensor = new FahrenheitSensor();
		public double celsius() { return (sensor.readFahrenheit() - 32) * 5 / 9; } // converts units, not just names
	}
	public static void main(String[] args) {
		System.out.println(new TemperatureAdapter().celsius());
	}
}

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public class Main {
	interface Target { void request(); } // Adapter: makes ONE incompatible interface fit
	static class SubsystemA { void a() { System.out.println("A"); } }
	static class SubsystemB { void b() { System.out.println("B"); } }
	static class Facade { // Facade: simplifies access to a WHOLE subsystem
		void doEverything() { new SubsystemA().a(); new SubsystemB().b(); }
	}
	public static void main(String[] args) {
		new Facade().doEverything();
	}
}

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