adapter design pattern implementation

Programs/Adapter/AdapterTest.java

@@ -0,0 +1,79 @@
+package Adapter;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+
+public class AdapterTest {
+
+    // Custom implementation of ServiceInterface for testing purposes
+    static class TestService implements ServiceInterface {
+        private String capturedData; // Stores the last action performed
+
+        @Override
+        public void performAction(String data) {
+            this.capturedData = data;
+        }
+
+        public String getCapturedData() {
+            return capturedData;
+        }
+    }
+
+    @Test
+    void testClientRequestThroughAdapter() {
+        // Arrange: Create a test implementation of ServiceInterface
+        TestService testService = new TestService();
+
+        // Wrap the test service with the Adapter
+        TargetInterface adapter = new Adapter(testService);
+
+        // Create the Client with the Adapter
+        Client client = new Client(adapter);
+
+        // Act: Client sends a request
+        String testRequest = "Test Request";
+        client.execute(testRequest);
+
+        // Assert: Verify the service captured the correct input
+        assertEquals(testRequest, testService.getCapturedData(), "The service should receive the correct request from the adapter.");
+    }
+
+    @Test
+    void testAdapterDirectTranslation() {
+        // Arrange: Create a test implementation of ServiceInterface
+        TestService testService = new TestService();
+
+        // Wrap the test service with the Adapter
+        TargetInterface adapter = new Adapter(testService);
+
+        // Act: Call the adapter's method directly
+        String testInput = "Adapter Test Input";
+        adapter.processRequest(testInput);
+
+        // Assert: Verify the service captured the correct input
+        assertEquals(testInput, testService.getCapturedData(), "The adapter should directly translate the request to the service.");
+    }
+
+    @Test
+    void testMultipleRequests() {
+        // Arrange: Create a test implementation of ServiceInterface
+        TestService testService = new TestService();
+
+        // Wrap the test service with the Adapter
+        TargetInterface adapter = new Adapter(testService);
+
+        // Create the Client with the Adapter
+        Client client = new Client(adapter);
+
+        // Act: Client sends multiple requests
+        String request1 = "Request One";
+        String request2 = "Request Two";
+
+        client.execute(request1);
+        assertEquals(request1, testService.getCapturedData(), "The service should capture the first request.");
+
+        client.execute(request2);
+        assertEquals(request2, testService.getCapturedData(), "The service should capture the second request.");
+    }
+}

Programs/Adapter/ServiceInterface.java

@@ -0,0 +1,5 @@
+package Adapter;
+
+public interface ServiceInterface {
+    void performAction(String data);
+}

Programs/Adapter/TargetInterface.java

@@ -0,0 +1,5 @@
+package Adapter;
+
+public interface TargetInterface {
+    void processRequest(String input);
+}

Programs/Adapter/adapter.java

@@ -0,0 +1,15 @@
+package Adapter;
+
+public class Adapter implements TargetInterface {
+    private final ServiceInterface service;
+
+    public Adapter(ServiceInterface service) {
+        this.service = service;
+    }
+
+    @Override
+    public void processRequest(String input) {
+        // Translating the Client's request to the Service's interface
+        service.performAction(input);
+    }
+}

Programs/Adapter/client.java

@@ -0,0 +1,14 @@
+package Adapter;
+
+public class Client {
+
+    private final TargetInterface target;
+
+    public Client(TargetInterface target) {
+        this.target = target;
+    }
+
+    public void execute(String request) {
+        target.processRequest(request);
+    }
+}

README.md

@@ -126,6 +126,7 @@ It is very easy to contribute, you may follow these steps -
 99.[RotateLinkedList](https://github.com/PrajaktaSathe/Java/blob/main/Programs/RotateLinkedList.java)-Program to demo rotating a linked list
 100. [ReverseString](https://github.com/PrajaktaSathe/Java/blob/main/ReverseString.java) -Program to reverse a String using the java method substring.
 101.[Overriding](https://github.com/PrajaktaSathe/Java/blob/main/Programs/Overriding.java)-Program to demo overriding in java
+103. [adapter pattern](https://github.com/PrajaktaSathe/Java/blob/main/Programs/Adapter/adapter.java)- adapter design pattern in java
 
 # Contributors - 
 ## A big thank you to all our contributors!!!