Added Java 11 support and created constants in App.java (#1238)

Co-authored-by: Ncherukumilliv <VenkatRamaSubbarago.Cherukumilli@Cevalogistics.com>

module/src/main/java/com/iluwatar/module/App.java

@@ -37,6 +37,8 @@ import java.io.FileNotFoundException;
  */
 public class App {
 
+  private static final String ERROR = "Error";
+  private static final String MESSAGE = "Message";
   public static FileLoggerModule fileLoggerModule;
   public static ConsoleLoggerModule consoleLoggerModule;
 
@@ -71,12 +73,12 @@ public class App {
   public static void execute(final String... args) {
 
     /* Send logs on file system */
-    fileLoggerModule.printString("Message");
-    fileLoggerModule.printErrorString("Error");
+    fileLoggerModule.printString(MESSAGE);
+    fileLoggerModule.printErrorString(ERROR);
 
     /* Send logs on console */
-    consoleLoggerModule.printString("Message");
-    consoleLoggerModule.printErrorString("Error");
+    consoleLoggerModule.printString(MESSAGE);
+    consoleLoggerModule.printErrorString(ERROR);
   }
 
   /**

module/src/test/java/com/iluwatar/module/FileLoggerModuleTest.java

@@ -65,7 +65,7 @@ public final class FileLoggerModuleTest {
   public void testFileMessage() throws IOException {
 
     /* Get singletong instance of File Logger Module */
-    final FileLoggerModule fileLoggerModule = FileLoggerModule.getSingleton();
+    final var fileLoggerModule = FileLoggerModule.getSingleton();
 
     /* Prepare the essential sub modules, to perform the sequence of jobs */
     fileLoggerModule.prepare();
@@ -89,7 +89,7 @@ public final class FileLoggerModuleTest {
   public void testNoFileMessage() throws IOException {
 
     /* Get singletong instance of File Logger Module */
-    final FileLoggerModule fileLoggerModule = FileLoggerModule.getSingleton();
+    final var fileLoggerModule = FileLoggerModule.getSingleton();
 
     /* Prepare the essential sub modules, to perform the sequence of jobs */
     fileLoggerModule.prepare();
@@ -111,7 +111,7 @@ public final class FileLoggerModuleTest {
   public void testFileErrorMessage() throws FileNotFoundException {
 
     /* Get singletong instance of File Logger Module */
-    final FileLoggerModule fileLoggerModule = FileLoggerModule.getSingleton();
+    final var fileLoggerModule = FileLoggerModule.getSingleton();
 
     /* Prepare the essential sub modules, to perform the sequence of jobs */
     fileLoggerModule.prepare();
@@ -136,7 +136,7 @@ public final class FileLoggerModuleTest {
   public void testNoFileErrorMessage() throws FileNotFoundException {
 
     /* Get singletong instance of File Logger Module */
-    final FileLoggerModule fileLoggerModule = FileLoggerModule.getSingleton();
+    final var fileLoggerModule = FileLoggerModule.getSingleton();
 
     /* Prepare the essential sub modules, to perform the sequence of jobs */
     fileLoggerModule.prepare();
@@ -157,7 +157,7 @@ public final class FileLoggerModuleTest {
   private static final String readFirstLine(final String file) {
 
     String firstLine = null;
-    try (BufferedReader bufferedReader = new BufferedReader(new FileReader(file))) {
+    try (var bufferedReader = new BufferedReader(new FileReader(file))) {
 
       while (bufferedReader.ready()) {