Java low level networking project (#770)

* made changes to java reflection

* removed redundant method makeSound in Animal abstract class

* added project for play-framework article

* added project for regex

* changed regex project from own model to core-java

* added project for routing in play

* made changes to regex project

* refactored code for REST API with Play project

* refactored student store indexing to zero base

* added unit tests, removed bad names

* added NIO Selector project under core-java module

* requested changes made

core-java/src/test/java/com/baeldung/java/networking/url/UrlTest.java

@@ -0,0 +1,104 @@
+package com.baeldung.java.networking.url;
+
+import static org.junit.Assert.assertEquals;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import org.junit.Test;
+
+public class UrlTest {
+
+    @Test
+    public void givenUrl_whenCanIdentifyProtocol_thenCorrect() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com");
+        assertEquals("http", url.getProtocol());
+    }
+
+    @Test
+    public void givenUrl_whenCanGetHost_thenCorrect() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com");
+        assertEquals("baeldung.com", url.getHost());
+    }
+
+    @Test
+    public void givenUrl_whenCanGetFileName_thenCorrect2() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com/articles?topic=java&version=8");
+        assertEquals("/articles?topic=java&version=8", url.getFile());
+    }
+
+    @Test
+    public void givenUrl_whenCanGetFileName_thenCorrect1() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com/guidelines.txt");
+        assertEquals("/guidelines.txt", url.getFile());
+    }
+
+    @Test
+    public void givenUrl_whenCanGetPathParams_thenCorrect() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com/articles?topic=java&version=8");
+        assertEquals("/articles", url.getPath());
+    }
+
+    @Test
+    public void givenUrl_whenCanGetQueryParams_thenCorrect() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com/articles?topic=java");
+        assertEquals("topic=java", url.getQuery());
+    }
+
+    @Test
+    public void givenUrl_whenGetsDefaultPort_thenCorrect() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com");
+        assertEquals(-1, url.getPort());
+        assertEquals(80, url.getDefaultPort());
+    }
+
+    @Test
+    public void givenUrl_whenGetsPort_thenCorrect() throws MalformedURLException {
+        URL url = new URL("http://baeldung.com:8090");
+        assertEquals(8090, url.getPort());
+        assertEquals(80, url.getDefaultPort());
+    }
+
+    @Test
+    public void givenBaseUrl_whenCreatesRelativeUrl_thenCorrect() throws MalformedURLException {
+        URL baseUrl = new URL("http://baeldung.com");
+        URL relativeUrl = new URL(baseUrl, "a-guide-to-java-sockets");
+        assertEquals("http://baeldung.com/a-guide-to-java-sockets", relativeUrl.toString());
+    }
+
+    @Test
+    public void givenAbsoluteUrl_whenIgnoresBaseUrl_thenCorrect() throws MalformedURLException {
+        URL baseUrl = new URL("http://baeldung.com");
+        URL relativeUrl = new URL(baseUrl, "http://baeldung.com/a-guide-to-java-sockets");
+        assertEquals("http://baeldung.com/a-guide-to-java-sockets", relativeUrl.toString());
+    }
+
+    @Test
+    public void givenUrlComponents_whenConstructsCompleteUrl_thenCorrect() throws MalformedURLException {
+        String protocol = "http";
+        String host = "baeldung.com";
+        String file = "/guidelines.txt";
+        URL url = new URL(protocol, host, file);
+        assertEquals("http://baeldung.com/guidelines.txt", url.toString());
+    }
+
+    @Test
+    public void givenUrlComponents_whenConstructsCompleteUrl_thenCorrect2() throws MalformedURLException {
+        String protocol = "http";
+        String host = "baeldung.com";
+        String file = "/articles?topic=java&version=8";
+        URL url = new URL(protocol, host, file);
+        assertEquals("http://baeldung.com/guidelines.txt", url.toString());
+    }
+
+    @Test
+    public void givenUrlComponentsWithPort_whenConstructsCompleteUrl_thenCorrect() throws MalformedURLException {
+        String protocol = "http";
+        String host = "baeldung.com";
+        int port = 9000;
+        String file = "/guidelines.txt";
+        URL url = new URL(protocol, host, port, file);
+        assertEquals("http://baeldung.com:9000/guidelines.txt", url.toString());
+    }
+
+}

core-java/src/test/java/com/baeldung/java/nio/selector/EchoTest.java

@@ -16,6 +16,7 @@ public class EchoTest {
         String resp2 = client.sendMessage("world");
         assertEquals("hello", resp1);
         assertEquals("world", resp2);
+
         process.destroy();
     }
 }