What are the examples of Adapter design pattern in JDK

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Pragya Keshap answered on February 10, 2023 Popularity 5/10 Helpfulness 1/10

answer What are the examples of Adapter design pattern in JDK

What are the examples of Adapter design pattern in JDK

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In JDK there are many places where Adapter design pattern is used.

Some of these are as follows:

java.util.Arrays.asList(): This method can adapt an Array

to work as a List.

java.util.Collections.list(): This method can adapt any

collection to provide List behavior.

java.util.Collections.enumeration(): This method returns

an enumeration over the collection.

java.io.InputStreamReader(InputStream): This method

adapts a Stream to Reader class.

java.io.OutputStreamWriter(OutputStream): This method

adapts an OutputStream to Writer class.

javax.xml.bind.annotation.adapters.XmlAdapter.marshal()

public class AdapterPatternTest {

	public static void main(String[] args) {
		
		testClassAdapter();
		testObjectAdapter();
	}

	private static void testObjectAdapter() {
		SocketAdapter sockAdapter = new SocketObjectAdapterImpl();
		Volt v3 = getVolt(sockAdapter,3);
		Volt v12 = getVolt(sockAdapter,12);
		Volt v120 = getVolt(sockAdapter,120);
		System.out.println("v3 volts using Object Adapter="+v3.getVolts());
		System.out.println("v12 volts using Object Adapter="+v12.getVolts());
		System.out.println("v120 volts using Object Adapter="+v120.getVolts());
	}

	private static void testClassAdapter() {
		SocketAdapter sockAdapter = new SocketClassAdapterImpl();
		Volt v3 = getVolt(sockAdapter,3);
		Volt v12 = getVolt(sockAdapter,12);
		Volt v120 = getVolt(sockAdapter,120);
		System.out.println("v3 volts using Class Adapter="+v3.getVolts());
		System.out.println("v12 volts using Class Adapter="+v12.getVolts());
		System.out.println("v120 volts using Class Adapter="+v120.getVolts());
	}
	
	private static Volt getVolt(SocketAdapter sockAdapter, int i) {
		switch (i){
		case 3: return sockAdapter.get3Volt();
		case 12: return sockAdapter.get12Volt();
		case 120: return sockAdapter.get120Volt();
		default: return sockAdapter.get120Volt();
		}
	}
}

https://www.digitalocean.com/community/tutorials/adapter-design-pattern-java

Popularity 5/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: adapter java

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Contributed on Feb 10 2023

Pragya Keshap

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What are the examples of Adapter design pattern in JDK

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